diff --git a/BaseClasses.py b/BaseClasses.py
index 735582e1..973a8d50 100644
--- a/BaseClasses.py
+++ b/BaseClasses.py
@@ -1,14 +1,15 @@
 from __future__ import annotations
 
 import copy
+import itertools
 import functools
 import logging
 import random
 import secrets
 import typing  # this can go away when Python 3.8 support is dropped
 from argparse import Namespace
-from collections import ChainMap, Counter, deque
-from collections.abc import Collection
+from collections import Counter, deque
+from collections.abc import Collection, MutableSequence
 from enum import IntEnum, IntFlag
 from typing import Any, Callable, Dict, Iterable, Iterator, List, NamedTuple, Optional, Set, Tuple, TypedDict, Union, \
     Type, ClassVar
@@ -47,7 +48,6 @@ class ThreadBarrierProxy:
 class MultiWorld():
     debug_types = False
     player_name: Dict[int, str]
-    _region_cache: Dict[int, Dict[str, Region]]
     difficulty_requirements: dict
     required_medallions: dict
     dark_room_logic: Dict[int, str]
@@ -57,7 +57,7 @@ class MultiWorld():
     plando_connections: List
     worlds: Dict[int, auto_world]
     groups: Dict[int, Group]
-    regions: List[Region]
+    regions: RegionManager
     itempool: List[Item]
     is_race: bool = False
     precollected_items: Dict[int, List[Item]]
@@ -92,6 +92,34 @@ class MultiWorld():
         def __getitem__(self, player) -> bool:
             return self.rule(player)
 
+    class RegionManager:
+        region_cache: Dict[int, Dict[str, Region]]
+        entrance_cache: Dict[int, Dict[str, Entrance]]
+        location_cache: Dict[int, Dict[str, Location]]
+
+        def __init__(self, players: int):
+            self.region_cache = {player: {} for player in range(1, players+1)}
+            self.entrance_cache = {player: {} for player in range(1, players+1)}
+            self.location_cache = {player: {} for player in range(1, players+1)}
+
+        def __iadd__(self, other: Iterable[Region]):
+            self.extend(other)
+            return self
+
+        def append(self, region: Region):
+            self.region_cache[region.player][region.name] = region
+
+        def extend(self, regions: Iterable[Region]):
+            for region in regions:
+                self.region_cache[region.player][region.name] = region
+
+        def __iter__(self) -> Iterator[Region]:
+            for regions in self.region_cache.values():
+                yield from regions.values()
+
+        def __len__(self):
+            return sum(len(regions) for regions in self.region_cache.values())
+
     def __init__(self, players: int):
         # world-local random state is saved for multiple generations running concurrently
         self.random = ThreadBarrierProxy(random.Random())
@@ -100,16 +128,12 @@ class MultiWorld():
         self.glitch_triforce = False
         self.algorithm = 'balanced'
         self.groups = {}
-        self.regions = []
+        self.regions = self.RegionManager(players)
         self.shops = []
         self.itempool = []
         self.seed = None
         self.seed_name: str = "Unavailable"
         self.precollected_items = {player: [] for player in self.player_ids}
-        self._cached_entrances = None
-        self._cached_locations = None
-        self._entrance_cache = {}
-        self._location_cache: Dict[Tuple[str, int], Location] = {}
         self.required_locations = []
         self.light_world_light_cone = False
         self.dark_world_light_cone = False
@@ -137,7 +161,6 @@ class MultiWorld():
             def set_player_attr(attr, val):
                 self.__dict__.setdefault(attr, {})[player] = val
 
-            set_player_attr('_region_cache', {})
             set_player_attr('shuffle', "vanilla")
             set_player_attr('logic', "noglitches")
             set_player_attr('mode', 'open')
@@ -199,7 +222,6 @@ class MultiWorld():
 
         self.game[new_id] = game
         self.player_types[new_id] = NetUtils.SlotType.group
-        self._region_cache[new_id] = {}
         world_type = AutoWorld.AutoWorldRegister.world_types[game]
         self.worlds[new_id] = world_type.create_group(self, new_id, players)
         self.worlds[new_id].collect_item = classmethod(AutoWorld.World.collect_item).__get__(self.worlds[new_id])
@@ -333,41 +355,17 @@ class MultiWorld():
     def world_name_lookup(self):
         return {self.player_name[player_id]: player_id for player_id in self.player_ids}
 
-    def _recache(self):
-        """Rebuild world cache"""
-        self._cached_locations = None
-        for region in self.regions:
-            player = region.player
-            self._region_cache[player][region.name] = region
-            for exit in region.exits:
-                self._entrance_cache[exit.name, player] = exit
-
-            for r_location in region.locations:
-                self._location_cache[r_location.name, player] = r_location
-
     def get_regions(self, player: Optional[int] = None) -> Collection[Region]:
-        return self.regions if player is None else self._region_cache[player].values()
+        return self.regions if player is None else self.regions.region_cache[player].values()
 
-    def get_region(self, regionname: str, player: int) -> Region:
-        try:
-            return self._region_cache[player][regionname]
-        except KeyError:
-            self._recache()
-            return self._region_cache[player][regionname]
+    def get_region(self, region_name: str, player: int) -> Region:
+        return self.regions.region_cache[player][region_name]
 
-    def get_entrance(self, entrance: str, player: int) -> Entrance:
-        try:
-            return self._entrance_cache[entrance, player]
-        except KeyError:
-            self._recache()
-            return self._entrance_cache[entrance, player]
+    def get_entrance(self, entrance_name: str, player: int) -> Entrance:
+        return self.regions.entrance_cache[player][entrance_name]
 
-    def get_location(self, location: str, player: int) -> Location:
-        try:
-            return self._location_cache[location, player]
-        except KeyError:
-            self._recache()
-            return self._location_cache[location, player]
+    def get_location(self, location_name: str, player: int) -> Location:
+        return self.regions.location_cache[player][location_name]
 
     def get_all_state(self, use_cache: bool) -> CollectionState:
         cached = getattr(self, "_all_state", None)
@@ -428,28 +426,22 @@ class MultiWorld():
 
         logging.debug('Placed %s at %s', item, location)
 
-    def get_entrances(self) -> List[Entrance]:
-        if self._cached_entrances is None:
-            self._cached_entrances = [entrance for region in self.regions for entrance in region.entrances]
-        return self._cached_entrances
-
-    def clear_entrance_cache(self):
-        self._cached_entrances = None
+    def get_entrances(self, player: Optional[int] = None) -> Iterable[Entrance]:
+        if player is not None:
+            return self.regions.entrance_cache[player].values()
+        return Utils.RepeatableChain(tuple(self.regions.entrance_cache[player].values()
+                                           for player in self.regions.entrance_cache))
 
     def register_indirect_condition(self, region: Region, entrance: Entrance):
         """Report that access to this Region can result in unlocking this Entrance,
         state.can_reach(Region) in the Entrance's traversal condition, as opposed to pure transition logic."""
         self.indirect_connections.setdefault(region, set()).add(entrance)
 
-    def get_locations(self, player: Optional[int] = None) -> List[Location]:
-        if self._cached_locations is None:
-            self._cached_locations = [location for region in self.regions for location in region.locations]
+    def get_locations(self, player: Optional[int] = None) -> Iterable[Location]:
         if player is not None:
-            return [location for location in self._cached_locations if location.player == player]
-        return self._cached_locations
-
-    def clear_location_cache(self):
-        self._cached_locations = None
+            return self.regions.location_cache[player].values()
+        return Utils.RepeatableChain(tuple(self.regions.location_cache[player].values()
+                                           for player in self.regions.location_cache))
 
     def get_unfilled_locations(self, player: Optional[int] = None) -> List[Location]:
         return [location for location in self.get_locations(player) if location.item is None]
@@ -471,16 +463,17 @@ class MultiWorld():
                 valid_locations = [location.name for location in self.get_unfilled_locations(player)]
             else:
                 valid_locations = location_names
+            relevant_cache = self.regions.location_cache[player]
             for location_name in valid_locations:
-                location = self._location_cache.get((location_name, player), None)
-                if location is not None and location.item is None:
+                location = relevant_cache.get(location_name, None)
+                if location and location.item is None:
                     yield location
 
     def unlocks_new_location(self, item: Item) -> bool:
         temp_state = self.state.copy()
         temp_state.collect(item, True)
 
-        for location in self.get_unfilled_locations():
+        for location in self.get_unfilled_locations(item.player):
             if temp_state.can_reach(location) and not self.state.can_reach(location):
                 return True
 
@@ -820,15 +813,83 @@ class Region:
     locations: List[Location]
     entrance_type: ClassVar[Type[Entrance]] = Entrance
 
+    class Register(MutableSequence):
+        region_manager: MultiWorld.RegionManager
+
+        def __init__(self, region_manager: MultiWorld.RegionManager):
+            self._list = []
+            self.region_manager = region_manager
+
+        def __getitem__(self, index: int) -> Location:
+            return self._list.__getitem__(index)
+
+        def __setitem__(self, index: int, value: Location) -> None:
+            raise NotImplementedError()
+
+        def __len__(self) -> int:
+            return self._list.__len__()
+
+        # This seems to not be needed, but that's a bit suspicious.
+        # def __del__(self):
+        #     self.clear()
+
+        def copy(self):
+            return self._list.copy()
+
+    class LocationRegister(Register):
+        def __delitem__(self, index: int) -> None:
+            location: Location = self._list.__getitem__(index)
+            self._list.__delitem__(index)
+            del(self.region_manager.location_cache[location.player][location.name])
+
+        def insert(self, index: int, value: Location) -> None:
+            self._list.insert(index, value)
+            self.region_manager.location_cache[value.player][value.name] = value
+
+    class EntranceRegister(Register):
+        def __delitem__(self, index: int) -> None:
+            entrance: Entrance = self._list.__getitem__(index)
+            self._list.__delitem__(index)
+            del(self.region_manager.entrance_cache[entrance.player][entrance.name])
+
+        def insert(self, index: int, value: Entrance) -> None:
+            self._list.insert(index, value)
+            self.region_manager.entrance_cache[value.player][value.name] = value
+
+    _locations: LocationRegister[Location]
+    _exits: EntranceRegister[Entrance]
+
     def __init__(self, name: str, player: int, multiworld: MultiWorld, hint: Optional[str] = None):
         self.name = name
         self.entrances = []
-        self.exits = []
-        self.locations = []
+        self._exits = self.EntranceRegister(multiworld.regions)
+        self._locations = self.LocationRegister(multiworld.regions)
         self.multiworld = multiworld
         self._hint_text = hint
         self.player = player
 
+    def get_locations(self):
+        return self._locations
+
+    def set_locations(self, new):
+        if new is self._locations:
+            return
+        self._locations.clear()
+        self._locations.extend(new)
+
+    locations = property(get_locations, set_locations)
+
+    def get_exits(self):
+        return self._exits
+
+    def set_exits(self, new):
+        if new is self._exits:
+            return
+        self._exits.clear()
+        self._exits.extend(new)
+
+    exits = property(get_exits, set_exits)
+
     def can_reach(self, state: CollectionState) -> bool:
         if state.stale[self.player]:
             state.update_reachable_regions(self.player)
diff --git a/Main.py b/Main.py
index 0995d209..691b88b1 100644
--- a/Main.py
+++ b/Main.py
@@ -122,10 +122,6 @@ def main(args, seed=None, baked_server_options: Optional[Dict[str, object]] = No
     logger.info('Creating Items.')
     AutoWorld.call_all(world, "create_items")
 
-    # All worlds should have finished creating all regions, locations, and entrances.
-    # Recache to ensure that they are all visible for locality rules.
-    world._recache()
-
     logger.info('Calculating Access Rules.')
 
     for player in world.player_ids:
@@ -233,7 +229,7 @@ def main(args, seed=None, baked_server_options: Optional[Dict[str, object]] = No
 
         region = Region("Menu", group_id, world, "ItemLink")
         world.regions.append(region)
-        locations = region.locations = []
+        locations = region.locations
         for item in world.itempool:
             count = common_item_count.get(item.player, {}).get(item.name, 0)
             if count:
@@ -267,7 +263,6 @@ def main(args, seed=None, baked_server_options: Optional[Dict[str, object]] = No
             world.itempool.extend(items_to_add[:itemcount - len(world.itempool)])
 
     if any(world.item_links.values()):
-        world._recache()
         world._all_state = None
 
     logger.info("Running Item Plando")
diff --git a/Utils.py b/Utils.py
index 88807ebe..4cf8ca22 100644
--- a/Utils.py
+++ b/Utils.py
@@ -5,6 +5,7 @@ import json
 import typing
 import builtins
 import os
+import itertools
 import subprocess
 import sys
 import pickle
@@ -903,3 +904,17 @@ def visualize_regions(root_region: Region, file_name: str, *,
 
     with open(file_name, "wt", encoding="utf-8") as f:
         f.write("\n".join(uml))
+
+
+class RepeatableChain:
+    def __init__(self, iterable: typing.Iterable):
+        self.iterable = iterable
+
+    def __iter__(self):
+        return itertools.chain.from_iterable(self.iterable)
+
+    def __bool__(self):
+        return any(sub_iterable for sub_iterable in self.iterable)
+
+    def __len__(self):
+        return sum(len(iterable) for iterable in self.iterable)
diff --git a/test/bases.py b/test/bases.py
index 5fe4df20..9911a45b 100644
--- a/test/bases.py
+++ b/test/bases.py
@@ -284,7 +284,7 @@ class WorldTestBase(unittest.TestCase):
 
         # basically a shortened reimplementation of this method from core, in order to force the check is done
         def fulfills_accessibility() -> bool:
-            locations = self.multiworld.get_locations(1).copy()
+            locations = list(self.multiworld.get_locations(1))
             state = CollectionState(self.multiworld)
             while locations:
                 sphere: typing.List[Location] = []
diff --git a/test/general/test_locations.py b/test/general/test_locations.py
index 2e609a75..63b3b0f3 100644
--- a/test/general/test_locations.py
+++ b/test/general/test_locations.py
@@ -36,7 +36,6 @@ class TestBase(unittest.TestCase):
         for game_name, world_type in AutoWorldRegister.world_types.items():
             with self.subTest("Game", game_name=game_name):
                 multiworld = setup_solo_multiworld(world_type, gen_steps)
-                multiworld._recache()
                 region_count = len(multiworld.get_regions())
                 location_count = len(multiworld.get_locations())
 
@@ -46,14 +45,12 @@ class TestBase(unittest.TestCase):
                 self.assertEqual(location_count, len(multiworld.get_locations()),
                                  f"{game_name} modified locations count during rule creation")
 
-                multiworld._recache()
                 call_all(multiworld, "generate_basic")
                 self.assertEqual(region_count, len(multiworld.get_regions()),
                                  f"{game_name} modified region count during generate_basic")
                 self.assertGreaterEqual(location_count, len(multiworld.get_locations()),
                                         f"{game_name} modified locations count during generate_basic")
 
-                multiworld._recache()
                 call_all(multiworld, "pre_fill")
                 self.assertEqual(region_count, len(multiworld.get_regions()),
                                  f"{game_name} modified region count during pre_fill")
diff --git a/worlds/alttp/ItemPool.py b/worlds/alttp/ItemPool.py
index 806a420f..88a2d899 100644
--- a/worlds/alttp/ItemPool.py
+++ b/worlds/alttp/ItemPool.py
@@ -293,7 +293,6 @@ def generate_itempool(world):
         loc.access_rule = lambda state: has_triforce_pieces(state, player)
 
         region.locations.append(loc)
-        multiworld.clear_location_cache()
 
         multiworld.push_item(loc, ItemFactory('Triforce', player), False)
         loc.event = True
diff --git a/worlds/alttp/Rom.py b/worlds/alttp/Rom.py
index 47cea8c2..e1ae0cc6 100644
--- a/worlds/alttp/Rom.py
+++ b/worlds/alttp/Rom.py
@@ -786,8 +786,8 @@ def patch_rom(world: MultiWorld, rom: LocalRom, player: int, enemized: bool):
 
     # patch items
 
-    for location in world.get_locations():
-        if location.player != player or location.address is None or location.shop_slot is not None:
+    for location in world.get_locations(player):
+        if location.address is None or location.shop_slot is not None:
             continue
 
         itemid = location.item.code if location.item is not None else 0x5A
@@ -2247,7 +2247,7 @@ def write_strings(rom, world, player):
                 tt['sign_north_of_links_house'] = '> Randomizer The telepathic tiles can have hints!'
             hint_locations = HintLocations.copy()
             local_random.shuffle(hint_locations)
-            all_entrances = [entrance for entrance in world.get_entrances() if entrance.player == player]
+            all_entrances = list(world.get_entrances(player))
             local_random.shuffle(all_entrances)
 
             # First we take care of the one inconvenient dungeon in the appropriately simple shuffles.
diff --git a/worlds/alttp/Rules.py b/worlds/alttp/Rules.py
index 1fddecd8..469f4f82 100644
--- a/worlds/alttp/Rules.py
+++ b/worlds/alttp/Rules.py
@@ -197,8 +197,13 @@ def global_rules(world, player):
     # determines which S&Q locations are available - hide from paths since it isn't an in-game location
     for exit in world.get_region('Menu', player).exits:
         exit.hide_path = True
-
-    set_rule(world.get_entrance('Old Man S&Q', player), lambda state: state.can_reach('Old Man', 'Location', player))
+    try:
+        old_man_sq = world.get_entrance('Old Man S&Q', player)
+    except KeyError:
+        pass  # it doesn't exist, should be dungeon-only unittests
+    else:
+        old_man = world.get_location("Old Man", player)
+        set_rule(old_man_sq, lambda state: old_man.can_reach(state))
 
     set_rule(world.get_location('Sunken Treasure', player), lambda state: state.has('Open Floodgate', player))
     set_rule(world.get_location('Dark Blacksmith Ruins', player), lambda state: state.has('Return Smith', player))
@@ -1526,16 +1531,16 @@ def set_bunny_rules(world: MultiWorld, player: int, inverted: bool):
     # Helper functions to determine if the moon pearl is required
     if inverted:
         def is_bunny(region):
-            return region.is_light_world
+            return region and region.is_light_world
 
         def is_link(region):
-            return region.is_dark_world
+            return region and region.is_dark_world
     else:
         def is_bunny(region):
-            return region.is_dark_world
+            return region and region.is_dark_world
 
         def is_link(region):
-            return region.is_light_world
+            return region and region.is_light_world
 
     def get_rule_to_add(region, location = None, connecting_entrance = None):
         # In OWG, a location can potentially be superbunny-mirror accessible or
@@ -1603,21 +1608,20 @@ def set_bunny_rules(world: MultiWorld, player: int, inverted: bool):
         return options_to_access_rule(possible_options)
 
     # Add requirements for bunny-impassible caves if link is a bunny in them
-    for region in [world.get_region(name, player) for name in bunny_impassable_caves]:
-
+    for region in (world.get_region(name, player) for name in bunny_impassable_caves):
         if not is_bunny(region):
             continue
         rule = get_rule_to_add(region)
-        for exit in region.exits:
-            add_rule(exit, rule)
+        for region_exit in region.exits:
+            add_rule(region_exit, rule)
 
     paradox_shop = world.get_region('Light World Death Mountain Shop', player)
     if is_bunny(paradox_shop):
         add_rule(paradox_shop.entrances[0], get_rule_to_add(paradox_shop))
 
     # Add requirements for all locations that are actually in the dark world, except those available to the bunny, including dungeon revival
-    for entrance in world.get_entrances():
-        if entrance.player == player and is_bunny(entrance.connected_region):
+    for entrance in world.get_entrances(player):
+        if is_bunny(entrance.connected_region):
             if world.logic[player] in ['minorglitches', 'owglitches', 'hybridglitches', 'nologic'] :
                 if entrance.connected_region.type == LTTPRegionType.Dungeon:
                     if entrance.parent_region.type != LTTPRegionType.Dungeon and entrance.connected_region.name in OverworldGlitchRules.get_invalid_bunny_revival_dungeons():
diff --git a/worlds/alttp/Shops.py b/worlds/alttp/Shops.py
index f17eb1ea..c0f2e223 100644
--- a/worlds/alttp/Shops.py
+++ b/worlds/alttp/Shops.py
@@ -348,7 +348,6 @@ def create_shops(world, player: int):
                     loc.item = ItemFactory(GetBeemizerItem(world, player, 'Nothing'), player)
                     loc.shop_slot_disabled = True
                 shop.region.locations.append(loc)
-                world.clear_location_cache()
 
 
 class ShopData(NamedTuple):
@@ -619,6 +618,4 @@ def create_dynamic_shop_locations(world, player):
                     if shop.type == ShopType.TakeAny:
                         loc.shop_slot_disabled = True
                     shop.region.locations.append(loc)
-                    world.clear_location_cache()
-
                     loc.shop_slot = i
diff --git a/worlds/alttp/__init__.py b/worlds/alttp/__init__.py
index 65e36da3..3af55b76 100644
--- a/worlds/alttp/__init__.py
+++ b/worlds/alttp/__init__.py
@@ -585,27 +585,26 @@ class ALTTPWorld(World):
 
         for player in checks_in_area:
             checks_in_area[player]["Total"] = 0
-
-        for location in multiworld.get_locations():
-            if location.game == cls.game and type(location.address) is int:
-                main_entrance = location.parent_region.get_connecting_entrance(is_main_entrance)
-                if location.parent_region.dungeon:
-                    dungeonname = {'Inverted Agahnims Tower': 'Agahnims Tower',
-                                   'Inverted Ganons Tower': 'Ganons Tower'} \
-                        .get(location.parent_region.dungeon.name, location.parent_region.dungeon.name)
-                    checks_in_area[location.player][dungeonname].append(location.address)
-                elif location.parent_region.type == LTTPRegionType.LightWorld:
-                    checks_in_area[location.player]["Light World"].append(location.address)
-                elif location.parent_region.type == LTTPRegionType.DarkWorld:
-                    checks_in_area[location.player]["Dark World"].append(location.address)
-                elif main_entrance.parent_region.type == LTTPRegionType.LightWorld:
-                    checks_in_area[location.player]["Light World"].append(location.address)
-                elif main_entrance.parent_region.type == LTTPRegionType.DarkWorld:
-                    checks_in_area[location.player]["Dark World"].append(location.address)
-                else:
-                    assert False, "Unknown Location area."
-                # TODO: remove Total as it's duplicated data and breaks consistent typing
-                checks_in_area[location.player]["Total"] += 1
+            for location in multiworld.get_locations(player):
+                if location.game == cls.game and type(location.address) is int:
+                    main_entrance = location.parent_region.get_connecting_entrance(is_main_entrance)
+                    if location.parent_region.dungeon:
+                        dungeonname = {'Inverted Agahnims Tower': 'Agahnims Tower',
+                                       'Inverted Ganons Tower': 'Ganons Tower'} \
+                            .get(location.parent_region.dungeon.name, location.parent_region.dungeon.name)
+                        checks_in_area[location.player][dungeonname].append(location.address)
+                    elif location.parent_region.type == LTTPRegionType.LightWorld:
+                        checks_in_area[location.player]["Light World"].append(location.address)
+                    elif location.parent_region.type == LTTPRegionType.DarkWorld:
+                        checks_in_area[location.player]["Dark World"].append(location.address)
+                    elif main_entrance.parent_region.type == LTTPRegionType.LightWorld:
+                        checks_in_area[location.player]["Light World"].append(location.address)
+                    elif main_entrance.parent_region.type == LTTPRegionType.DarkWorld:
+                        checks_in_area[location.player]["Dark World"].append(location.address)
+                    else:
+                        assert False, "Unknown Location area."
+                    # TODO: remove Total as it's duplicated data and breaks consistent typing
+                    checks_in_area[location.player]["Total"] += 1
 
         multidata["checks_in_area"].update(checks_in_area)
 
diff --git a/worlds/alttp/test/dungeons/TestDungeon.py b/worlds/alttp/test/dungeons/TestDungeon.py
index 94c30c34..8ca2791d 100644
--- a/worlds/alttp/test/dungeons/TestDungeon.py
+++ b/worlds/alttp/test/dungeons/TestDungeon.py
@@ -1,5 +1,5 @@
 from BaseClasses import CollectionState, ItemClassification
-from worlds.alttp.Dungeons import create_dungeons, get_dungeon_item_pool
+from worlds.alttp.Dungeons import get_dungeon_item_pool
 from worlds.alttp.EntranceShuffle import mandatory_connections, connect_simple
 from worlds.alttp.ItemPool import difficulties
 from worlds.alttp.Items import ItemFactory
diff --git a/worlds/checksfinder/__init__.py b/worlds/checksfinder/__init__.py
index feff1486..4978500d 100644
--- a/worlds/checksfinder/__init__.py
+++ b/worlds/checksfinder/__init__.py
@@ -69,8 +69,8 @@ class ChecksFinderWorld(World):
     def create_regions(self):
         menu = Region("Menu", self.player, self.multiworld)
         board = Region("Board", self.player, self.multiworld)
-        board.locations = [ChecksFinderAdvancement(self.player, loc_name, loc_data.id, board)
-                           for loc_name, loc_data in advancement_table.items() if loc_data.region == board.name]
+        board.locations += [ChecksFinderAdvancement(self.player, loc_name, loc_data.id, board)
+                            for loc_name, loc_data in advancement_table.items() if loc_data.region == board.name]
 
         connection = Entrance(self.player, "New Board", menu)
         menu.exits.append(connection)
diff --git a/worlds/ladx/Locations.py b/worlds/ladx/Locations.py
index 6c89db38..1fd6772c 100644
--- a/worlds/ladx/Locations.py
+++ b/worlds/ladx/Locations.py
@@ -219,7 +219,7 @@ def create_regions_from_ladxr(player, multiworld, logic):
 
         r = LinksAwakeningRegion(
             name=name, ladxr_region=l, hint="", player=player, world=multiworld)
-        r.locations = [LinksAwakeningLocation(player, r, i) for i in l.items]
+        r.locations += [LinksAwakeningLocation(player, r, i) for i in l.items]
         regions[l] = r
 
     for ladxr_location in logic.location_list:
diff --git a/worlds/ladx/__init__.py b/worlds/ladx/__init__.py
index 1d6c85dd..d21190bb 100644
--- a/worlds/ladx/__init__.py
+++ b/worlds/ladx/__init__.py
@@ -231,9 +231,7 @@ class LinksAwakeningWorld(World):
                             # Find instrument, lock
                             # TODO: we should be able to pinpoint the region we want, save a lookup table please
                             found = False
-                            for r in self.multiworld.get_regions():
-                                if r.player != self.player:
-                                    continue
+                            for r in self.multiworld.get_regions(self.player):
                                 if r.dungeon_index != item.item_data.dungeon_index:
                                     continue
                                 for loc in r.locations:
@@ -269,10 +267,7 @@ class LinksAwakeningWorld(World):
         event_location.place_locked_item(self.create_event("Can Play Trendy Game"))
        
         self.dungeon_locations_by_dungeon = [[], [], [], [], [], [], [], [], []]     
-        for r in self.multiworld.get_regions():
-            if r.player != self.player:
-                continue
-
+        for r in self.multiworld.get_regions(self.player):
             # Set aside dungeon locations
             if r.dungeon_index:
                 self.dungeon_locations_by_dungeon[r.dungeon_index - 1] += r.locations
diff --git a/worlds/meritous/Regions.py b/worlds/meritous/Regions.py
index 2c66a024..de34570d 100644
--- a/worlds/meritous/Regions.py
+++ b/worlds/meritous/Regions.py
@@ -54,12 +54,12 @@ def create_regions(world: MultiWorld, player: int):
         world.regions.append(boss_region)
 
     region_final_boss = Region("Final Boss", player, world)
-    region_final_boss.locations = [MeritousLocation(
+    region_final_boss.locations += [MeritousLocation(
         player, "Wervyn Anixil", None, region_final_boss)]
     world.regions.append(region_final_boss)
 
     region_tfb = Region("True Final Boss", player, world)
-    region_tfb.locations = [MeritousLocation(
+    region_tfb.locations += [MeritousLocation(
         player, "Wervyn Anixil?", None, region_tfb)]
     world.regions.append(region_tfb)
 
diff --git a/worlds/oot/__init__.py b/worlds/oot/__init__.py
index 2ac54169..f7941716 100644
--- a/worlds/oot/__init__.py
+++ b/worlds/oot/__init__.py
@@ -195,7 +195,8 @@ class OOTWorld(World):
             setattr(self, option_name, option_value)
 
         self.shop_prices = {}
-        self.regions = []  # internal cache of regions for this world, used later
+        self.regions = []  # internal caches of regions for this world, used later
+        self._regions_cache = {}
         self.remove_from_start_inventory = []  # some items will be precollected but not in the inventory
         self.starting_items = Counter()
         self.songs_as_items = False
@@ -526,6 +527,10 @@ class OOTWorld(World):
                         # We still need to fill the location even if ALR is off.
                         logger.debug('Unreachable location: %s', new_location.name)
                     new_location.player = self.player
+                    # Change some attributes of Drop locations
+                    if new_location.type == 'Drop':
+                        new_location.name = new_region.name + ' ' + new_location.name
+                        new_location.show_in_spoiler = False
                     new_region.locations.append(new_location)
             if 'events' in region:
                 for event, rule in region['events'].items():
@@ -555,7 +560,8 @@ class OOTWorld(World):
 
             self.multiworld.regions.append(new_region)
             self.regions.append(new_region)
-        self.multiworld._recache()
+            self._regions_cache[new_region.name] = new_region
+        # self.multiworld._recache()
 
     def set_scrub_prices(self):
         # Get Deku Scrub Locations
@@ -622,7 +628,7 @@ class OOTWorld(World):
             'Twinrova',
             'Links Pocket'
         )
-        boss_rewards = [item for item in self.itempool if item.type == 'DungeonReward']
+        boss_rewards = sorted(map(self.create_item, self.item_name_groups['rewards']))
         boss_locations = [self.multiworld.get_location(loc, self.player) for loc in boss_location_names]
 
         placed_prizes = [loc.item.name for loc in boss_locations if loc.item is not None]
@@ -636,7 +642,6 @@ class OOTWorld(World):
             item = prizepool.pop()
             loc = prize_locs.pop()
             loc.place_locked_item(item)
-            self.multiworld.itempool.remove(item)
             self.hinted_dungeon_reward_locations[item.name] = loc
 
     def create_item(self, name: str, allow_arbitrary_name: bool = False):
@@ -671,7 +676,7 @@ class OOTWorld(World):
         self.multiworld.regions.append(menu)
         self.load_regions_from_json(overworld_data_path)
         self.load_regions_from_json(bosses_data_path)
-        start.connect(self.multiworld.get_region('Root', self.player))
+        start.connect(self.get_region('Root'))
         create_dungeons(self)
         self.parser.create_delayed_rules()
 
@@ -682,16 +687,11 @@ class OOTWorld(World):
         # Bind entrances to vanilla
         for region in self.regions:
             for exit in region.exits:
-                exit.connect(self.multiworld.get_region(exit.vanilla_connected_region, self.player))
+                exit.connect(self.get_region(exit.vanilla_connected_region))
 
     def create_items(self):
-        # Uniquely rename drop locations for each region and erase them from the spoiler
-        set_drop_location_names(self)
         # Generate itempool
         generate_itempool(self)
-        # Add dungeon rewards
-        rewardlist = sorted(list(self.item_name_groups['rewards']))
-        self.itempool += map(self.create_item, rewardlist)
 
         junk_pool = get_junk_pool(self)
         removed_items = []
@@ -769,7 +769,7 @@ class OOTWorld(World):
 
         # Kill unreachable events that can't be gotten even with all items
         # Make sure to only kill actual internal events, not in-game "events"
-        all_state = self.multiworld.get_all_state(False)
+        all_state = self.multiworld.get_all_state(use_cache=True)
         all_locations = self.get_locations()
         reachable = self.multiworld.get_reachable_locations(all_state, self.player)
         unreachable = [loc for loc in all_locations if
@@ -781,7 +781,6 @@ class OOTWorld(World):
         bigpoe = self.multiworld.get_location('Sell Big Poe from Market Guard House', self.player)
         if not all_state.has('Bottle with Big Poe', self.player) and bigpoe not in reachable:
             bigpoe.parent_region.locations.remove(bigpoe)
-        self.multiworld.clear_location_cache()
 
         # If fast scarecrow then we need to kill the Pierre location as it will be unreachable
         if self.free_scarecrow:
@@ -997,6 +996,7 @@ class OOTWorld(World):
                             fill_restrictive(multiworld, multiworld.get_all_state(False), locations, group_dungeon_items,
                                 single_player_placement=False, lock=True, allow_excluded=True)
 
+
     def generate_output(self, output_directory: str):
         if self.hints != 'none':
             self.hint_data_available.wait()
@@ -1032,30 +1032,6 @@ class OOTWorld(World):
                 player_name=self.multiworld.get_player_name(self.player))
             apz5.write()
 
-            # Write entrances to spoiler log
-            all_entrances = self.get_shuffled_entrances()
-            all_entrances.sort(reverse=True, key=lambda x: x.name)
-            all_entrances.sort(reverse=True, key=lambda x: x.type)
-            if not self.decouple_entrances:
-                while all_entrances:
-                    loadzone = all_entrances.pop()
-                    if loadzone.type != 'Overworld':
-                        if loadzone.primary:
-                            entrance = loadzone
-                        else:
-                            entrance = loadzone.reverse
-                        if entrance.reverse is not None:
-                            self.multiworld.spoiler.set_entrance(entrance, entrance.replaces.reverse, 'both', self.player)
-                        else:
-                            self.multiworld.spoiler.set_entrance(entrance, entrance.replaces, 'entrance', self.player)
-                    else:
-                        reverse = loadzone.replaces.reverse
-                        if reverse in all_entrances:
-                            all_entrances.remove(reverse)
-                        self.multiworld.spoiler.set_entrance(loadzone, reverse, 'both', self.player)
-            else:
-                for entrance in all_entrances:
-                    self.multiworld.spoiler.set_entrance(entrance, entrance.replaces, 'entrance', self.player)
 
     # Gathers hint data for OoT. Loops over all world locations for woth, barren, and major item locations.
     @classmethod
@@ -1135,6 +1111,7 @@ class OOTWorld(World):
             for autoworld in multiworld.get_game_worlds("Ocarina of Time"):
                 autoworld.hint_data_available.set()
 
+
     def fill_slot_data(self):
         self.collectible_flags_available.wait()
         return {
@@ -1142,6 +1119,7 @@ class OOTWorld(World):
             'collectible_flag_offsets': self.collectible_flag_offsets
         }
 
+
     def modify_multidata(self, multidata: dict):
 
         # Replace connect name
@@ -1156,6 +1134,7 @@ class OOTWorld(World):
                 continue
             multidata["precollected_items"][self.player].remove(item_id)
 
+
     def extend_hint_information(self, er_hint_data: dict):
 
         er_hint_data[self.player] = {}
@@ -1202,6 +1181,7 @@ class OOTWorld(World):
                             er_hint_data[self.player][location.address] = main_entrance.name
                             logger.debug(f"Set {location.name} hint data to {main_entrance.name}")
 
+
     def write_spoiler(self, spoiler_handle: typing.TextIO) -> None:
         required_trials_str = ", ".join(t for t in self.skipped_trials if not self.skipped_trials[t])
         spoiler_handle.write(f"\n\nTrials ({self.multiworld.get_player_name(self.player)}): {required_trials_str}\n")
@@ -1211,6 +1191,32 @@ class OOTWorld(World):
             for k, v in self.shop_prices.items():
                 spoiler_handle.write(f"{k}: {v} Rupees\n")
 
+        # Write entrances to spoiler log
+        all_entrances = self.get_shuffled_entrances()
+        all_entrances.sort(reverse=True, key=lambda x: x.name)
+        all_entrances.sort(reverse=True, key=lambda x: x.type)
+        if not self.decouple_entrances:
+            while all_entrances:
+                loadzone = all_entrances.pop()
+                if loadzone.type != 'Overworld':
+                    if loadzone.primary:
+                        entrance = loadzone
+                    else:
+                        entrance = loadzone.reverse
+                    if entrance.reverse is not None:
+                        self.multiworld.spoiler.set_entrance(entrance, entrance.replaces.reverse, 'both', self.player)
+                    else:
+                        self.multiworld.spoiler.set_entrance(entrance, entrance.replaces, 'entrance', self.player)
+                else:
+                    reverse = loadzone.replaces.reverse
+                    if reverse in all_entrances:
+                        all_entrances.remove(reverse)
+                    self.multiworld.spoiler.set_entrance(loadzone, reverse, 'both', self.player)
+        else:
+            for entrance in all_entrances:
+                self.multiworld.spoiler.set_entrance(entrance, entrance.replaces, 'entrance', self.player)
+
+
     # Key ring handling:
     # Key rings are multiple items glued together into one, so we need to give
     # the appropriate number of keys in the collection state when they are
@@ -1242,9 +1248,8 @@ class OOTWorld(World):
             return False
 
     def get_shufflable_entrances(self, type=None, only_primary=False):
-        return [entrance for entrance in self.multiworld.get_entrances() if (entrance.player == self.player and
-                                                                             (type == None or entrance.type == type) and
-                                                                             (not only_primary or entrance.primary))]
+        return [entrance for entrance in self.multiworld.get_entrances(self.player) if (
+                (type == None or entrance.type == type) and (not only_primary or entrance.primary))]
 
     def get_shuffled_entrances(self, type=None, only_primary=False):
         return [entrance for entrance in self.get_shufflable_entrances(type=type, only_primary=only_primary) if
@@ -1258,8 +1263,13 @@ class OOTWorld(World):
     def get_location(self, location):
         return self.multiworld.get_location(location, self.player)
 
-    def get_region(self, region):
-        return self.multiworld.get_region(region, self.player)
+    def get_region(self, region_name):
+        try:
+            return self._regions_cache[region_name]
+        except KeyError:
+            ret = self.multiworld.get_region(region_name, self.player)
+            self._regions_cache[region_name] = ret
+            return ret
 
     def get_entrance(self, entrance):
         return self.multiworld.get_entrance(entrance, self.player)
diff --git a/worlds/pokemon_rb/__init__.py b/worlds/pokemon_rb/__init__.py
index 11aa737e..6b8008ea 100644
--- a/worlds/pokemon_rb/__init__.py
+++ b/worlds/pokemon_rb/__init__.py
@@ -445,13 +445,9 @@ class PokemonRedBlueWorld(World):
         # Delete evolution events for Pokémon that are not in logic in an all_state so that accessibility check does not
         # fail. Re-use test_state from previous final loop.
         evolutions_region = self.multiworld.get_region("Evolution", self.player)
-        clear_cache = False
         for location in evolutions_region.locations.copy():
             if not test_state.can_reach(location, player=self.player):
                 evolutions_region.locations.remove(location)
-                clear_cache = True
-        if clear_cache:
-            self.multiworld.clear_location_cache()
 
         if self.multiworld.old_man[self.player] == "early_parcel":
             self.multiworld.local_early_items[self.player]["Oak's Parcel"] = 1
@@ -559,7 +555,6 @@ class PokemonRedBlueWorld(World):
                     else:
                         raise Exception("Failed to remove corresponding item while deleting unreachable Dexsanity location")
 
-            self.multiworld._recache()
 
         if self.multiworld.door_shuffle[self.player] == "decoupled":
             swept_state = self.multiworld.state.copy()
diff --git a/worlds/pokemon_rb/rom.py b/worlds/pokemon_rb/rom.py
index 4b191d91..096ab8e0 100644
--- a/worlds/pokemon_rb/rom.py
+++ b/worlds/pokemon_rb/rom.py
@@ -546,10 +546,8 @@ def generate_output(self, output_directory: str):
 
     write_quizzes(self, data, random)
 
-    for location in self.multiworld.get_locations():
-        if location.player != self.player:
-            continue
-        elif location.party_data:
+    for location in self.multiworld.get_locations(self.player):
+        if location.party_data:
             for party in location.party_data:
                 if not isinstance(party["party_address"], list):
                     addresses = [rom_addresses[party["party_address"]]]
diff --git a/worlds/ror2/Rules.py b/worlds/ror2/Rules.py
index 7d941774..65c04d06 100644
--- a/worlds/ror2/Rules.py
+++ b/worlds/ror2/Rules.py
@@ -96,8 +96,7 @@ def set_rules(multiworld: MultiWorld, player: int) -> None:
         #   a long enough run to have enough director credits for scavengers and
         #   help prevent being stuck in the same stages until that point.)
 
-        for location in multiworld.get_locations():
-            if location.player != player: continue  # ignore all checks that don't belong to this player
+        for location in multiworld.get_locations(player):
             if "Scavenger" in location.name:
                 add_rule(location, lambda state: state.has("Stage_5", player))
         # Regions
diff --git a/worlds/sm/__init__.py b/worlds/sm/__init__.py
index f208e600..4b4002c1 100644
--- a/worlds/sm/__init__.py
+++ b/worlds/sm/__init__.py
@@ -294,7 +294,7 @@ class SMWorld(World):
         for src, dest in self.variaRando.randoExec.areaGraph.InterAreaTransitions:
             src_region = self.multiworld.get_region(src.Name, self.player)
             dest_region = self.multiworld.get_region(dest.Name, self.player)
-            if ((src.Name + "->" + dest.Name, self.player) not in self.multiworld._entrance_cache):
+            if src.Name + "->" + dest.Name not in self.multiworld.regions.entrance_cache[self.player]:
                 src_region.exits.append(Entrance(self.player, src.Name + "->" + dest.Name, src_region))
             srcDestEntrance = self.multiworld.get_entrance(src.Name + "->" + dest.Name, self.player)
             srcDestEntrance.connect(dest_region)
@@ -563,8 +563,8 @@ class SMWorld(World):
         multiWorldItems: List[ByteEdit] = []
         idx = 0
         vanillaItemTypesCount = 21
-        for itemLoc in self.multiworld.get_locations():
-            if itemLoc.player == self.player and "Boss" not in locationsDict[itemLoc.name].Class:
+        for itemLoc in self.multiworld.get_locations(self.player):
+            if "Boss" not in locationsDict[itemLoc.name].Class:
                 SMZ3NameToSMType = {
                     "ETank": "ETank", "Missile": "Missile", "Super": "Super", "PowerBomb": "PowerBomb", "Bombs": "Bomb",
                     "Charge": "Charge", "Ice": "Ice", "HiJump": "HiJump", "SpeedBooster": "SpeedBooster",
diff --git a/worlds/soe/__init__.py b/worlds/soe/__init__.py
index 9a8f38cd..d02a8d02 100644
--- a/worlds/soe/__init__.py
+++ b/worlds/soe/__init__.py
@@ -417,7 +417,7 @@ class SoEWorld(World):
                     flags += option.to_flag()
 
             with open(placement_file, "wb") as f:  # generate placement file
-                for location in filter(lambda l: l.player == self.player, self.multiworld.get_locations()):
+                for location in self.multiworld.get_locations(self.player):
                     item = location.item
                     assert item is not None, "Can't handle unfilled location"
                     if item.code is None or location.address is None:
diff --git a/worlds/undertale/__init__.py b/worlds/undertale/__init__.py
index 5e363447..9e784a4a 100644
--- a/worlds/undertale/__init__.py
+++ b/worlds/undertale/__init__.py
@@ -193,7 +193,7 @@ class UndertaleWorld(World):
     def create_regions(self):
         def UndertaleRegion(region_name: str, exits=[]):
             ret = Region(region_name, self.player, self.multiworld)
-            ret.locations = [UndertaleAdvancement(self.player, loc_name, loc_data.id, ret)
+            ret.locations += [UndertaleAdvancement(self.player, loc_name, loc_data.id, ret)
                              for loc_name, loc_data in advancement_table.items()
                              if loc_data.region == region_name and
                              (loc_name not in exclusion_table["NoStats"] or
diff --git a/worlds/witness/hints.py b/worlds/witness/hints.py
index 4fd0edc4..8a9dab54 100644
--- a/worlds/witness/hints.py
+++ b/worlds/witness/hints.py
@@ -228,8 +228,8 @@ def make_hints(multiworld: MultiWorld, player: int, hint_amount: int):
         if item.player == player and item.code and item.advancement
     }
     loc_in_this_world = {
-        location.name for location in multiworld.get_locations()
-        if location.player == player and location.address
+        location.name for location in multiworld.get_locations(player)
+        if location.address
     }
 
     always_locations = [
diff --git a/worlds/zillion/__init__.py b/worlds/zillion/__init__.py
index 1e79f4f1..a5e1bfe1 100644
--- a/worlds/zillion/__init__.py
+++ b/worlds/zillion/__init__.py
@@ -329,23 +329,22 @@ class ZillionWorld(World):
         empty = zz_items[4]
         multi_item = empty  # a different patcher method differentiates empty from ap multi item
         multi_items: Dict[str, Tuple[str, str]] = {}  # zz_loc_name to (item_name, player_name)
-        for loc in self.multiworld.get_locations():
-            if loc.player == self.player:
-                z_loc = cast(ZillionLocation, loc)
-                # debug_zz_loc_ids[z_loc.zz_loc.name] = id(z_loc.zz_loc)
-                if z_loc.item is None:
-                    self.logger.warn("generate_output location has no item - is that ok?")
-                    z_loc.zz_loc.item = empty
-                elif z_loc.item.player == self.player:
-                    z_item = cast(ZillionItem, z_loc.item)
-                    z_loc.zz_loc.item = z_item.zz_item
-                else:  # another player's item
-                    # print(f"put multi item in {z_loc.zz_loc.name}")
-                    z_loc.zz_loc.item = multi_item
-                    multi_items[z_loc.zz_loc.name] = (
-                        z_loc.item.name,
-                        self.multiworld.get_player_name(z_loc.item.player)
-                    )
+        for loc in self.multiworld.get_locations(self.player):
+            z_loc = cast(ZillionLocation, loc)
+            # debug_zz_loc_ids[z_loc.zz_loc.name] = id(z_loc.zz_loc)
+            if z_loc.item is None:
+                self.logger.warn("generate_output location has no item - is that ok?")
+                z_loc.zz_loc.item = empty
+            elif z_loc.item.player == self.player:
+                z_item = cast(ZillionItem, z_loc.item)
+                z_loc.zz_loc.item = z_item.zz_item
+            else:  # another player's item
+                # print(f"put multi item in {z_loc.zz_loc.name}")
+                z_loc.zz_loc.item = multi_item
+                multi_items[z_loc.zz_loc.name] = (
+                    z_loc.item.name,
+                    self.multiworld.get_player_name(z_loc.item.player)
+                )
         # debug_zz_loc_ids.sort()
         # for name, id_ in debug_zz_loc_ids.items():
         #     print(id_)