diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 841716792df..aa6aa6e86a3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -308,6 +308,7 @@ if (MSVC)
       ${Boost_INCLUDE_DIRS}
       ${PUGIXML_INCLUDE_DIR}
       ${CURL_INCLUDE_DIRS}
+      ${PARALLEL_HASHMAP_INCLUDE_DIRS}
       ${Protobuf_INCLUDE_DIRS}
       ${SPDLOG_INCLUDE_DIR}
       ${GMP_INCLUDE_DIR}
@@ -335,6 +336,7 @@ else()
     PRIVATE
       ${CMAKE_SOURCE_DIR}/src
       ${LUAJIT_INCLUDE_DIRS}
+      ${PARALLEL_HASHMAP_INCLUDE_DIRS}
       ${Protobuf_INCLUDE_DIRS}
       ${GMP_INCLUDE_DIRS}
   )
diff --git a/src/creatures/monsters/monster.h b/src/creatures/monsters/monster.h
index e85bac478e1..839d4486f23 100644
--- a/src/creatures/monsters/monster.h
+++ b/src/creatures/monsters/monster.h
@@ -28,7 +28,7 @@ class Creature;
 class Game;
 class Spawn;
 
-using CreatureHashSet = std::unordered_set<Creature*>;
+using CreatureHashSet = phmap::flat_hash_set<Creature*>;
 using CreatureList = std::list<Creature*>;
 
 class Monster final : public Creature
diff --git a/src/creatures/monsters/monsters.h b/src/creatures/monsters/monsters.h
index c2ad25581c4..bbffffc8883 100644
--- a/src/creatures/monsters/monsters.h
+++ b/src/creatures/monsters/monsters.h
@@ -131,7 +131,7 @@ class MonsterType
 		bool targetPreferMaster = false;
 
 		Faction_t faction = FACTION_DEFAULT;
-		std::unordered_set<Faction_t> enemyFactions;
+		phmap::flat_hash_set<Faction_t> enemyFactions;
 
 		bool canPushItems = false;
 		bool canPushCreatures = false;
diff --git a/src/creatures/players/grouping/groups.cpp b/src/creatures/players/grouping/groups.cpp
index 7d2ac315aed..ec37e924914 100644
--- a/src/creatures/players/grouping/groups.cpp
+++ b/src/creatures/players/grouping/groups.cpp
@@ -24,7 +24,7 @@
 #include "utils/pugicast.h"
 #include "utils/tools.h"
 
-const std::unordered_map<std::string, PlayerFlags> ParsePlayerFlagMap = {
+const phmap::flat_hash_map<std::string, PlayerFlags> ParsePlayerFlagMap = {
 	{"cannotusecombat", PlayerFlag_CannotUseCombat},
 	{"cannotattackplayer", PlayerFlag_CannotAttackPlayer},
 	{"cannotattackmonster", PlayerFlag_CannotAttackMonster},
@@ -65,9 +65,9 @@ const std::unordered_map<std::string, PlayerFlags> ParsePlayerFlagMap = {
 	{"isalwayspremium", PlayerFlag_IsAlwaysPremium}
 };
 
-const std::unordered_map<std::string, PlayerCustomFlags> ParsePlayerCustomFlagMap = {
-  {"canmapclickteleport", PlayerCustomFlag_CanMapClickTeleport},
-  {"ignoredbynpcs", PlayerCustomFlag_IgnoredByNpcs}
+const phmap::flat_hash_map<std::string, PlayerCustomFlags> ParsePlayerCustomFlagMap = {
+	{"canmapclickteleport", PlayerCustomFlag_CanMapClickTeleport},
+	{"ignoredbynpcs", PlayerCustomFlag_IgnoredByNpcs}
 };
 
 bool Groups::load()
diff --git a/src/creatures/players/player.cpp b/src/creatures/players/player.cpp
index 6d745c59972..c923be4b414 100644
--- a/src/creatures/players/player.cpp
+++ b/src/creatures/players/player.cpp
@@ -5456,7 +5456,7 @@ uint16_t Player::getHelpers() const
 	uint16_t helpers;
 
 	if (guild && party) {
-		std::unordered_set<Player*> helperSet;
+		phmap::flat_hash_set<Player*> helperSet;
 
 		const auto& guildMembers = guild->getMembersOnline();
 		helperSet.insert(guildMembers.begin(), guildMembers.end());
diff --git a/src/creatures/players/player.h b/src/creatures/players/player.h
index 6865efaa39f..a8847a3c85d 100644
--- a/src/creatures/players/player.h
+++ b/src/creatures/players/player.h
@@ -2154,9 +2154,9 @@ class Player final : public Creature, public Cylinder
 		void internalAddThing(Thing* thing) override;
 		void internalAddThing(uint32_t index, Thing* thing) override;
 
-		std::unordered_set<uint32_t> attackedSet;
+		phmap::flat_hash_set<uint32_t> attackedSet;
 
-		std::unordered_set<uint32_t> VIPList;
+		phmap::flat_hash_set<uint32_t> VIPList;
 
 		std::map<uint8_t, OpenContainer> openContainers;
 		std::map<uint32_t, DepotLocker*> depotLockerMap;
diff --git a/src/game/game.h b/src/game/game.h
index 47647a50ee7..ff4aba18490 100644
--- a/src/game/game.h
+++ b/src/game/game.h
@@ -471,7 +471,7 @@ class Game
 		void sendOfflineTrainingDialog(Player* player);
 
 		const std::map<uint16_t, uint32_t>& getItemsPrice() const { return itemsPriceMap; }
-		const std::unordered_map<uint32_t, Player*>& getPlayers() const { return players; }
+		const phmap::flat_hash_map<uint32_t, Player*>& getPlayers() const { return players; }
 		const std::map<uint32_t, Npc*>& getNpcs() const { return npcs; }
 
 		const std::vector<ItemClassification*>& getItemsClassifications() const { return itemsClassifications; }
@@ -490,7 +490,7 @@ class Game
 		void removeGuild(uint32_t guildId);
 		void decreaseBrowseFieldRef(const Position& pos);
 
-		std::unordered_map<Tile*, Container*> browseFields;
+		phmap::flat_hash_map<Tile*, Container*> browseFields;
 
 		void internalRemoveItems(std::vector<Item*> itemList, uint32_t amount, bool stackable);
 
@@ -514,7 +514,7 @@ class Game
 		GameStore gameStore;
 		Canary::protobuf::appearances::Appearances appearances;
 
-		std::unordered_set<Tile*> getTilesToClean() const {
+		phmap::flat_hash_set<Tile*> getTilesToClean() const {
 			return tilesToClean;
 		}
 		void addTileToClean(Tile* tile) {
@@ -586,11 +586,11 @@ class Game
 		bool playerSpeakTo(Player* player, SpeakClasses type, const std::string& receiver, const std::string& text);
 		void playerSpeakToNpc(Player* player, const std::string& text);
 
-		std::unordered_map<uint32_t, Player*> players;
-		std::unordered_map<uint32_t, uint8_t> playersActiveImbuements;
-		std::unordered_map<std::string, Player*> mappedPlayerNames;
-		std::unordered_map<uint32_t, Guild*> guilds;
-		std::unordered_map<uint16_t, Item*> uniqueItems;
+		phmap::flat_hash_map<uint32_t, Player*> players;
+		phmap::flat_hash_map<uint32_t, uint8_t> playersActiveImbuements;
+		phmap::flat_hash_map<std::string, Player*> mappedPlayerNames;
+		phmap::flat_hash_map<uint32_t, Guild*> guilds;
+		phmap::flat_hash_map<uint16_t, Item*> uniqueItems;
 		std::map<uint32_t, uint32_t> stages;
 
 		/* Items stored from the lua scripts positions
@@ -626,7 +626,7 @@ class Game
 
 		std::map<uint32_t, BedItem*> bedSleepersMap;
 
-		std::unordered_set<Tile*> tilesToClean;
+		phmap::flat_hash_set<Tile*> tilesToClean;
 
 		ModalWindow offlineTrainingWindow { std::numeric_limits<uint32_t>::max(), "Choose a Skill", "Please choose a skill:" };
 
diff --git a/src/game/scheduling/scheduler.h b/src/game/scheduling/scheduler.h
index 52b7774d4b9..d570937508f 100644
--- a/src/game/scheduling/scheduler.h
+++ b/src/game/scheduling/scheduler.h
@@ -87,7 +87,7 @@ class Scheduler : public ThreadHolder<Scheduler>
 
 		uint32_t lastEventId {0};
 		std::priority_queue<SchedulerTask*, std::deque<SchedulerTask*>, TaskComparator> eventList;
-		std::unordered_set<uint32_t> eventIds;
+		phmap::flat_hash_set<uint32_t> eventIds;
 };
 
 constexpr auto g_scheduler = &Scheduler::getInstance;
diff --git a/src/items/functions/item_parse.hpp b/src/items/functions/item_parse.hpp
index 7ce7163040e..f45e94339ff 100644
--- a/src/items/functions/item_parse.hpp
+++ b/src/items/functions/item_parse.hpp
@@ -28,7 +28,7 @@
 
 class ConditionDamage;
 
-const std::unordered_map<std::string, ItemParseAttributes_t> ItemParseAttributesMap = {
+const phmap::flat_hash_map<std::string, ItemParseAttributes_t> ItemParseAttributesMap = {
 	{"type", ITEM_PARSE_TYPE},
 	{"description", ITEM_PARSE_DESCRIPTION},
 	{"runespellname", ITEM_PARSE_RUNESPELLNAME},
@@ -149,7 +149,7 @@ const std::unordered_map<std::string, ItemParseAttributes_t> ItemParseAttributes
 	{"imbuementslot", ITEM_PARSE_IMBUEMENT},
 };
 
-const std::unordered_map<std::string, ItemTypes_t> ItemTypesMap = {
+const phmap::flat_hash_map<std::string, ItemTypes_t> ItemTypesMap = {
 	{"key", ITEM_TYPE_KEY},
 	{"magicfield", ITEM_TYPE_MAGICFIELD},
 	{"container", ITEM_TYPE_CONTAINER},
@@ -169,7 +169,7 @@ const std::unordered_map<std::string, ItemTypes_t> ItemTypesMap = {
 	{"potion", ITEM_TYPE_POTION},
 };
 
-const std::unordered_map<std::string, TileFlags_t> TileStatesMap = {
+const phmap::flat_hash_map<std::string, TileFlags_t> TileStatesMap = {
 	{"down", TILESTATE_FLOORCHANGE_DOWN},
 	{"north", TILESTATE_FLOORCHANGE_NORTH},
 	{"south", TILESTATE_FLOORCHANGE_SOUTH},
@@ -179,7 +179,7 @@ const std::unordered_map<std::string, TileFlags_t> TileStatesMap = {
 	{"eastalt", TILESTATE_FLOORCHANGE_EAST_ALT},
 };
 
-const std::unordered_map<std::string, Fluids_t> FluidTypesMap = {
+const phmap::flat_hash_map<std::string, Fluids_t> FluidTypesMap = {
 	{"water", FLUID_WATER },
 	{"blood", FLUID_BLOOD},
 	{"beer", FLUID_BEER},
@@ -200,7 +200,7 @@ const std::unordered_map<std::string, Fluids_t> FluidTypesMap = {
 	{"ink", FLUID_INK },
 };
 
-const std::unordered_map<std::string, WeaponType_t> WeaponTypesMap = {
+const phmap::flat_hash_map<std::string, WeaponType_t> WeaponTypesMap = {
 	{"sword", WEAPON_SWORD},
 	{"club", WEAPON_CLUB},
 	{"axe", WEAPON_AXE},
@@ -210,7 +210,7 @@ const std::unordered_map<std::string, WeaponType_t> WeaponTypesMap = {
 	{"ammunition", WEAPON_AMMO}
 };
 
-const std::unordered_map<std::string, ImbuementTypes_t> ImbuementsTypeMap = {
+const phmap::flat_hash_map<std::string, ImbuementTypes_t> ImbuementsTypeMap = {
 	{"elemental damage", IMBUEMENT_ELEMENTAL_DAMAGE},
 	{"life leech", IMBUEMENT_LIFE_LEECH},
 	{"mana leech", IMBUEMENT_MANA_LEECH},
diff --git a/src/items/item.h b/src/items/item.h
index 77b053e1c02..568e710e7c5 100644
--- a/src/items/item.h
+++ b/src/items/item.h
@@ -319,7 +319,7 @@ class ItemAttributes
 		static double emptyDouble;
 		static bool emptyBool;
 
-		typedef std::unordered_map<std::string, CustomAttribute> CustomAttributeMap;
+		typedef phmap::flat_hash_map<std::string, CustomAttribute> CustomAttributeMap;
 
 		struct Attribute {
 			union {
diff --git a/src/items/items.cpp b/src/items/items.cpp
index 6b170d06b8d..9675700493e 100644
--- a/src/items/items.cpp
+++ b/src/items/items.cpp
@@ -43,7 +43,7 @@ void Items::clear()
 	nameToItems.clear();
 }
 
-using LootTypeNames = std::unordered_map<std::string, ItemTypes_t>;
+using LootTypeNames = phmap::flat_hash_map<std::string, ItemTypes_t>;
 
 LootTypeNames lootTypeNames = {
 	{"armor", ITEM_TYPE_ARMOR},
diff --git a/src/items/tile.h b/src/items/tile.h
index 63a9b2e0849..065e5930e03 100644
--- a/src/items/tile.h
+++ b/src/items/tile.h
@@ -37,7 +37,7 @@ class BedItem;
 
 using CreatureVector = std::vector<Creature*>;
 using ItemVector = std::vector<Item*>;
-using SpectatorHashSet = std::unordered_set<Creature*>;
+using SpectatorHashSet = phmap::flat_hash_set<Creature*>;
 
 class TileItemVector : private ItemVector
 {
diff --git a/src/lua/scripts/lua_environment.hpp b/src/lua/scripts/lua_environment.hpp
index 75e636747f5..e4607fb90e2 100644
--- a/src/lua/scripts/lua_environment.hpp
+++ b/src/lua/scripts/lua_environment.hpp
@@ -59,16 +59,16 @@ class LuaEnvironment: public LuaScriptInterface {
 	private:
 		void executeTimerEvent(uint32_t eventIndex);
 
-		std::unordered_map < uint32_t,
+		phmap::flat_hash_map < uint32_t,
 		LuaTimerEventDesc > timerEvents;
-		std::unordered_map < uint32_t,
+		phmap::flat_hash_map < uint32_t,
 		Combat * > combatMap;
-		std::unordered_map < uint32_t,
+		phmap::flat_hash_map < uint32_t,
 		AreaCombat * > areaMap;
 
-		std::unordered_map < LuaScriptInterface * ,
+		phmap::flat_hash_map < LuaScriptInterface * ,
 		std::vector < uint32_t >> combatIdMap;
-		std::unordered_map < LuaScriptInterface * ,
+		phmap::flat_hash_map < LuaScriptInterface * ,
 		std::vector < uint32_t >> areaIdMap;
 
 		LuaScriptInterface * testInterface = nullptr;
diff --git a/src/lua/scripts/script_environment.hpp b/src/lua/scripts/script_environment.hpp
index 1ee98c1697a..128e109227b 100644
--- a/src/lua/scripts/script_environment.hpp
+++ b/src/lua/scripts/script_environment.hpp
@@ -98,7 +98,7 @@ class ScriptEnvironment {
 		static std::multimap < ScriptEnvironment * , Item * > tempItems;
 
 		// local item map
-		std::unordered_map < uint32_t, Item * > localMap;
+		phmap::flat_hash_map < uint32_t, Item * > localMap;
 		uint32_t lastUID = std::numeric_limits < uint16_t > ::max();
 
 		// script file id
diff --git a/src/map/house/house.h b/src/map/house/house.h
index 6bced1d230e..a9b435e0928 100644
--- a/src/map/house/house.h
+++ b/src/map/house/house.h
@@ -46,8 +46,8 @@ class AccessList
 
 	private:
 		std::string list;
-		std::unordered_set<uint32_t> playerList;
-		std::unordered_set<uint32_t> guildRankList;
+		phmap::flat_hash_set<uint32_t> playerList;
+		phmap::flat_hash_set<uint32_t> guildRankList;
 		bool allowEveryone = false;
 };
 
diff --git a/src/map/map.h b/src/map/map.h
index b6d29a09217..9365fa12352 100644
--- a/src/map/map.h
+++ b/src/map/map.h
@@ -70,7 +70,7 @@ class AStarNodes
 	private:
 		AStarNode nodes[MAX_NODES];
 		bool openNodes[MAX_NODES];
-		std::unordered_map<uint32_t, AStarNode*> nodeTable;
+		phmap::flat_hash_map<uint32_t, AStarNode*> nodeTable;
 		size_t curNode;
 		int_fast32_t closedNodes;
 };
diff --git a/src/otpch.h b/src/otpch.h
index 3346d2a879f..6980096a922 100644
--- a/src/otpch.h
+++ b/src/otpch.h
@@ -46,5 +46,6 @@
 #include <pugixml.hpp>
 
 #include "spdlog/spdlog.h"
+#include "parallel_hashmap/phmap.h"
 
 #endif  // SRC_OTPCH_H_
diff --git a/src/server/network/connection/connection.h b/src/server/network/connection/connection.h
index 7bb49150fd8..fe6cdf83acd 100644
--- a/src/server/network/connection/connection.h
+++ b/src/server/network/connection/connection.h
@@ -59,7 +59,7 @@ class ConnectionManager
 	private:
 		ConnectionManager() = default;
 
-		std::unordered_set<Connection_ptr> connections;
+		phmap::flat_hash_set<Connection_ptr> connections;
 		std::mutex connectionManagerLock;
 };
 
diff --git a/src/server/network/protocol/protocolgame.cpp b/src/server/network/protocol/protocolgame.cpp
index a96e6859164..82f56c4e9dd 100644
--- a/src/server/network/protocol/protocolgame.cpp
+++ b/src/server/network/protocol/protocolgame.cpp
@@ -6712,7 +6712,7 @@ void ProtocolGame::openImbuementWindow(Item *item)
 	}
 
 	std::vector<Imbuement *> imbuements = g_imbuements().getImbuements(player, item);
-	std::unordered_map<uint16_t, uint16_t> needItems;
+	phmap::flat_hash_map<uint16_t, uint16_t> needItems;
 
 	msg.add<uint16_t>(imbuements.size());
 	for (const Imbuement *imbuement : imbuements)
@@ -7173,7 +7173,7 @@ void ProtocolGame::reloadCreature(const Creature *creature)
 
 	NetworkMessage msg;
 
-	std::unordered_set<uint32_t>::iterator it = std::find(knownCreatureSet.begin(), knownCreatureSet.end(), creature->getID());
+	phmap::flat_hash_set<uint32_t>::iterator it = std::find(knownCreatureSet.begin(), knownCreatureSet.end(), creature->getID());
 	if (it != knownCreatureSet.end())
 	{
 		msg.addByte(0x6B);
diff --git a/src/server/network/protocol/protocolgame.h b/src/server/network/protocol/protocolgame.h
index e038b75e24c..25a546019a0 100644
--- a/src/server/network/protocol/protocolgame.h
+++ b/src/server/network/protocol/protocolgame.h
@@ -474,7 +474,7 @@ class ProtocolGame final : public Protocol
 
 	friend class Player;
 
-	std::unordered_set<uint32_t> knownCreatureSet;
+	phmap::flat_hash_set<uint32_t> knownCreatureSet;
 	Player *player = nullptr;
 
 	uint32_t eventConnect = 0;
diff --git a/src/server/server.h b/src/server/server.h
index a3b60fa53ac..5d5de16dd3b 100644
--- a/src/server/server.h
+++ b/src/server/server.h
@@ -116,7 +116,7 @@ class ServiceManager
 	private:
 		void die();
 
-		std::unordered_map<uint16_t, ServicePort_ptr> acceptors;
+		phmap::flat_hash_map<uint16_t, ServicePort_ptr> acceptors;
 
 		boost::asio::io_service io_service;
 		Signals signals{io_service};
diff --git a/src/utils/tools.cpp b/src/utils/tools.cpp
index 8837eb1c201..29d804c6f01 100644
--- a/src/utils/tools.cpp
+++ b/src/utils/tools.cpp
@@ -503,19 +503,19 @@ Direction getDirectionTo(const Position& from, const Position& to)
 	return dir;
 }
 
-using MagicEffectNames = std::unordered_map<std::string, MagicEffectClasses>;
-using ShootTypeNames = std::unordered_map<std::string, ShootType_t>;
-using CombatTypeNames = std::unordered_map<CombatType_t, std::string, std::hash<int32_t>>;
-using AmmoTypeNames = std::unordered_map<std::string, Ammo_t>;
-using WeaponActionNames = std::unordered_map<std::string, WeaponAction_t>;
-using SkullNames = std::unordered_map<std::string, Skulls_t>;
-using ImbuementTypeNames = std::unordered_map<std::string, ImbuementTypes_t>;
+using MagicEffectNames = phmap::flat_hash_map<std::string, MagicEffectClasses>;
+using ShootTypeNames = phmap::flat_hash_map<std::string, ShootType_t>;
+using CombatTypeNames = phmap::flat_hash_map<CombatType_t, std::string, std::hash<int32_t>>;
+using AmmoTypeNames = phmap::flat_hash_map<std::string, Ammo_t>;
+using WeaponActionNames = phmap::flat_hash_map<std::string, WeaponAction_t>;
+using SkullNames = phmap::flat_hash_map<std::string, Skulls_t>;
+using ImbuementTypeNames = phmap::flat_hash_map<std::string, ImbuementTypes_t>;
 
 /**
  * @Deprecated
  * It will be dropped with monsters. Use RespawnPeriod_t instead.
  */
-using SpawnTypeNames = std::unordered_map<std::string, SpawnType_t>;
+using SpawnTypeNames = phmap::flat_hash_map<std::string, SpawnType_t>;
 
 MagicEffectNames magicEffectNames = {
 	{"assassin",			CONST_ME_ASSASSIN},
diff --git a/src/utils/utils_definitions.hpp b/src/utils/utils_definitions.hpp
index 9edc424aeeb..bc93a4bedd7 100644
--- a/src/utils/utils_definitions.hpp
+++ b/src/utils/utils_definitions.hpp
@@ -683,7 +683,7 @@ enum item_t : uint16_t {
 };
 
 // A map which contains items that, when on creating, should be transformed to the default type.
-const std::unordered_map<item_t, item_t> ItemTransformationMap = {
+const phmap::flat_hash_map<item_t, item_t> ItemTransformationMap = {
 	{ITEM_SWORD_RING_ACTIVATED, ITEM_SWORD_RING},
 	{ITEM_CLUB_RING_ACTIVATED, ITEM_CLUB_RING},
 	{ITEM_DWARVEN_RING_ACTIVATED, ITEM_DWARVEN_RING},
@@ -753,7 +753,7 @@ enum Blessings_t : uint8_t {
 	HEARTH_OF_THE_MOUNTAIN = 8,
 };
 
-const std::unordered_map<Blessings_t, std::string> BlessingNames = {
+const phmap::flat_hash_map<Blessings_t, std::string> BlessingNames = {
 	{TWIST_OF_FATE, "Twist of Fate"},
 	{WISDOM_OF_SOLITUDE, "The Wisdom of Solitude"},
 	{SPARK_OF_THE_PHOENIX, "The Spark of the Phoenix"},
diff --git a/vcpkg.json b/vcpkg.json
index 56e1730af44..5101167b7d4 100644
--- a/vcpkg.json
+++ b/vcpkg.json
@@ -13,6 +13,7 @@
     "curl",
     "jsoncpp",
     "protobuf",
+    "parallel-hashmap",
     {
       "name": "luajit",
       "platform": "!arm"