[*] change all std::unordered_map and std::unordered_set into ankerl::unordered_dense::map/set variants (#3442)

mainly doing this to reduce memory footprint; we all know how nice ankerl::unordered_dense is

in theory 4x faster - in practice these maps arent that "hot" anyways so not likely to have much perf gained

i just want to reduce mem fragmentation to ease my porting process, plus it helps other platforms as well (ahem weak Mediatek devices) :)

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Co-authored-by: Caio Oliveira <caiooliveirafarias0@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3442
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

26 files changed, 96 insertions, 69 deletions

diff --git a/src/core/arm/dynarmic/arm_dynarmic_64.h b/src/core/arm/dynarmic/arm_dynarmic_64.h
index 2ea1505ce7..07f6bb9449 100644
--- a/src/core/arm/dynarmic/arm_dynarmic_64.h
+++ b/src/core/arm/dynarmic/arm_dynarmic_64.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -8,7 +8,7 @@
 
 #include <atomic>
 #include <memory>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include <dynarmic/interface/A64/a64.h>
 #include "common/common_types.h"
diff --git a/src/core/arm/nce/lru_cache.h b/src/core/arm/nce/lru_cache.h
index 1bc00c8f14..947b66f675 100644
--- a/src/core/arm/nce/lru_cache.h
+++ b/src/core/arm/nce/lru_cache.h
@@ -1,11 +1,11 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #pragma once
 #include <list>
 #include <optional>
 #include <shared_mutex>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <utility>
 
 #include "common/logging/log.h"
@@ -144,7 +144,7 @@ private:
     using list_type      = std::list<key_type>;
     using list_iterator  = typename list_type::iterator;
     using map_value_type = std::pair<list_iterator, value_type>;
-    using map_type       = std::unordered_map<key_type, map_value_type>;
+    using map_type       = ankerl::unordered_dense::map<key_type, map_value_type>;
 
     template <typename V>
     void insert_or_update(const key_type& key, V&& value) {
diff --git a/src/core/arm/nce/patcher.h b/src/core/arm/nce/patcher.h
index f2b11fcda0..8612cfc63d 100644
--- a/src/core/arm/nce/patcher.h
+++ b/src/core/arm/nce/patcher.h
@@ -4,7 +4,7 @@
 #pragma once
 
 #include <span>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <vector>
 #include <oaknut/code_block.hpp>
 #include <oaknut/oaknut.hpp>
@@ -46,7 +46,7 @@ enum class PatchMode : u32 {
 
 using ModuleTextAddress = u64;
 using PatchTextAddress = u64;
-using EntryTrampolines = std::unordered_map<ModuleTextAddress, PatchTextAddress>;
+using EntryTrampolines = ankerl::unordered_dense::map<ModuleTextAddress, PatchTextAddress>;
 
 class Patcher {
 public:
diff --git a/src/core/file_sys/vfs/vfs_layered.cpp b/src/core/file_sys/vfs/vfs_layered.cpp
index 47b2a3c780..8dabe03e16 100644
--- a/src/core/file_sys/vfs/vfs_layered.cpp
+++ b/src/core/file_sys/vfs/vfs_layered.cpp
@@ -1,9 +1,12 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include <algorithm>
 #include <set>
-#include <unordered_set>
+#include <ankerl/unordered_dense.h>
 #include <utility>
 #include "core/file_sys/vfs/vfs_layered.h"
 
@@ -60,7 +63,7 @@ std::string LayeredVfsDirectory::GetFullPath() const {
 
 std::vector<VirtualFile> LayeredVfsDirectory::GetFiles() const {
     std::vector<VirtualFile> out;
-    std::unordered_set<std::string> out_names;
+    ankerl::unordered_dense::set<std::string> out_names;
 
     for (const auto& layer : dirs) {
         for (auto& file : layer->GetFiles()) {
@@ -76,7 +79,7 @@ std::vector<VirtualFile> LayeredVfsDirectory::GetFiles() const {
 
 std::vector<VirtualDir> LayeredVfsDirectory::GetSubdirectories() const {
     std::vector<VirtualDir> out;
-    std::unordered_set<std::string> out_names;
+    ankerl::unordered_dense::set<std::string> out_names;
 
     for (const auto& layer : dirs) {
         for (const auto& sd : layer->GetSubdirectories()) {
diff --git a/src/core/hle/kernel/k_process.h b/src/core/hle/kernel/k_process.h
index 13717cc090..975448f0dd 100644
--- a/src/core/hle/kernel/k_process.h
+++ b/src/core/hle/kernel/k_process.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
@@ -78,7 +78,7 @@ private:
     std::array<DebugWatchpoint, Core::Hardware::NUM_WATCHPOINTS> m_watchpoints{};
     std::map<KProcessAddress, u64> m_debug_page_refcounts{};
 #ifdef HAS_NCE
-    std::unordered_map<u64, u64> m_post_handlers{};
+    ankerl::unordered_dense::map<u64, u64> m_post_handlers{};
 #endif
     std::unique_ptr<Core::ExclusiveMonitor> m_exclusive_monitor;
     Core::Memory::Memory m_memory;
@@ -493,7 +493,7 @@ public:
     static void Switch(KProcess* cur_process, KProcess* next_process);
 
 #ifdef HAS_NCE
-    std::unordered_map<u64, u64>& GetPostHandlers() noexcept {
+    ankerl::unordered_dense::map<u64, u64>& GetPostHandlers() noexcept {
         return m_post_handlers;
     }
 #endif
diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp
index 6986a98e35..5c2b6a4a88 100644
--- a/src/core/hle/kernel/kernel.cpp
+++ b/src/core/hle/kernel/kernel.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
@@ -10,7 +10,7 @@
 #include <functional>
 #include <memory>
 #include <thread>
-#include <unordered_set>
+#include <ankerl/unordered_dense.h>
 #include <utility>
 
 #include "common/assert.h"
@@ -786,8 +786,8 @@ struct KernelCore::Impl {
 
     std::optional<KObjectNameGlobalData> object_name_global_data;
 
-    std::unordered_set<KAutoObject*> registered_objects;
-    std::unordered_set<KAutoObject*> registered_in_use_objects;
+    ankerl::unordered_dense::set<KAutoObject*> registered_objects;
+    ankerl::unordered_dense::set<KAutoObject*> registered_in_use_objects;
 
     std::mutex server_lock;
     std::vector<std::unique_ptr<Service::ServerManager>> server_managers;
diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h
index 5d1a34281a..3b754e9397 100644
--- a/src/core/hle/kernel/kernel.h
+++ b/src/core/hle/kernel/kernel.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
@@ -11,7 +11,7 @@
 #include <list>
 #include <memory>
 #include <string>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <vector>
 
 #include "common/polyfill_thread.h"
diff --git a/src/core/hle/service/am/frontend/applet_web_browser_types.h b/src/core/hle/service/am/frontend/applet_web_browser_types.h
index 0892a6a716..3574568f6f 100644
--- a/src/core/hle/service/am/frontend/applet_web_browser_types.h
+++ b/src/core/hle/service/am/frontend/applet_web_browser_types.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
@@ -7,7 +7,7 @@
 #pragma once
 
 #include <array>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <vector>
 
 #include "common/common_funcs.h"
@@ -176,6 +176,6 @@ struct WebCommonReturnValue {
 };
 static_assert(sizeof(WebCommonReturnValue) == 0x1010, "WebCommonReturnValue has incorrect size.");
 
-using WebArgInputTLVMap = std::unordered_map<WebArgInputTLVType, std::vector<u8>>;
+using WebArgInputTLVMap = ankerl::unordered_dense::map<WebArgInputTLVType, std::vector<u8>>;
 
 } // namespace Service::AM::Frontend
diff --git a/src/core/hle/service/bcat/news/builtin_news.cpp b/src/core/hle/service/bcat/news/builtin_news.cpp
index 2c93da71e0..43b0445039 100644
--- a/src/core/hle/service/bcat/news/builtin_news.cpp
+++ b/src/core/hle/service/bcat/news/builtin_news.cpp
@@ -44,8 +44,8 @@ std::vector<u8> default_logo_small;
 std::vector<u8> default_logo_large;
 bool default_logos_loaded = false;
 
-std::unordered_map<std::string, std::vector<u8>> news_images_small;
-std::unordered_map<std::string, std::vector<u8>> news_images_large;
+ankerl::unordered_dense::map<std::string, std::vector<u8>> news_images_small;
+ankerl::unordered_dense::map<std::string, std::vector<u8>> news_images_large;
 std::mutex images_mutex;
 
 
diff --git a/src/core/hle/service/bcat/news/news_storage.h b/src/core/hle/service/bcat/news/news_storage.h
index ad84e4080c..531e2adb9a 100644
--- a/src/core/hle/service/bcat/news/news_storage.h
+++ b/src/core/hle/service/bcat/news/news_storage.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
@@ -12,7 +12,7 @@
 #include <optional>
 #include <span>
 #include <string>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <vector>
 
 #include "common/common_types.h"
@@ -93,7 +93,7 @@ private:
     static s64 Now();
 
     mutable std::mutex mtx;
-    std::unordered_map<std::string, StoredNews> items;
+    ankerl::unordered_dense::map<std::string, StoredNews> items;
     size_t open_counter{};
 };
 
diff --git a/src/core/hle/service/caps/caps_manager.h b/src/core/hle/service/caps/caps_manager.h
index 893a9075a0..22f5672e47 100644
--- a/src/core/hle/service/caps/caps_manager.h
+++ b/src/core/hle/service/caps/caps_manager.h
@@ -1,9 +1,12 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include "common/fs/fs.h"
 #include "core/hle/result.h"
@@ -85,7 +88,7 @@ private:
     AlbumFileDateTime ConvertToAlbumDateTime(u64 posix_time) const;
 
     bool is_mounted{};
-    std::unordered_map<AlbumFileId, std::filesystem::path> album_files;
+    ankerl::unordered_dense::map<AlbumFileId, std::filesystem::path> album_files;
 
     Core::System& system;
 };
diff --git a/src/core/hle/service/ldn/lan_discovery.h b/src/core/hle/service/ldn/lan_discovery.h
index 0d15583172..d39197efff 100644
--- a/src/core/hle/service/ldn/lan_discovery.h
+++ b/src/core/hle/service/ldn/lan_discovery.h
@@ -1,7 +1,7 @@
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #pragma once
@@ -15,7 +15,7 @@
 #include <random>
 #include <span>
 #include <thread>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include "common/logging/log.h"
 #include "common/socket_types.h"
@@ -119,7 +119,7 @@ protected:
     std::array<LanStation, StationCountMax> stations;
     std::array<NodeLatestUpdate, NodeCountMax> node_changes{};
     std::array<u8, NodeCountMax> node_last_states{};
-    std::unordered_map<MacAddress, NetworkInfo, MACAddressHash> scan_results{};
+    ankerl::unordered_dense::map<MacAddress, NetworkInfo, MACAddressHash> scan_results{};
     NodeInfo node_info{};
     NetworkInfo network_info{};
     State state{State::None};
diff --git a/src/core/hle/service/lm/lm.cpp b/src/core/hle/service/lm/lm.cpp
index b8a34d34eb..2fda8a3b90 100644
--- a/src/core/hle/service/lm/lm.cpp
+++ b/src/core/hle/service/lm/lm.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -7,7 +7,7 @@
 #include <string>
 
 #include <optional>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <boost/container_hash/hash.hpp>
 #include "common/logging/log.h"
 #include "core/core.h"
@@ -331,7 +331,7 @@ private:
     };
     static_assert(sizeof(LogPacketHeader) == 0x18, "LogPacketHeader is an invalid size");
 
-    std::unordered_map<LogPacketHeaderEntry, std::vector<u8>> entries{};
+    ankerl::unordered_dense::map<LogPacketHeaderEntry, std::vector<u8>> entries{};
     LogDestination destination{LogDestination::All};
 };
 
diff --git a/src/core/hle/service/nifm/nifm.cpp b/src/core/hle/service/nifm/nifm.cpp
index 8fecef96d2..710a95a455 100644
--- a/src/core/hle/service/nifm/nifm.cpp
+++ b/src/core/hle/service/nifm/nifm.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -23,7 +23,7 @@
 #include <mutex>
 #include <optional>
 #include <thread>
-#include <unordered_set>
+#include <ankerl/unordered_dense.h>
 #include <common/settings.h>
 
 #ifdef _WIN32
diff --git a/src/core/hle/service/nvdrv/core/container.h b/src/core/hle/service/nvdrv/core/container.h
index cf549d7f32..62404e14a7 100644
--- a/src/core/hle/service/nvdrv/core/container.h
+++ b/src/core/hle/service/nvdrv/core/container.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2022 yuzu Emulator Project
 // SPDX-FileCopyrightText: 2022 Skyline Team and Contributors
 // SPDX-License-Identifier: GPL-3.0-or-later
@@ -6,7 +9,7 @@
 
 #include <deque>
 #include <memory>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include "core/device_memory_manager.h"
 #include "core/hle/service/nvdrv/nvdata.h"
diff --git a/src/core/hle/service/nvdrv/core/nvmap.h b/src/core/hle/service/nvdrv/core/nvmap.h
index b8be599ae9..17b9ccd1c7 100644
--- a/src/core/hle/service/nvdrv/core/nvmap.h
+++ b/src/core/hle/service/nvdrv/core/nvmap.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2022 yuzu Emulator Project
 // SPDX-FileCopyrightText: 2022 Skyline Team and Contributors
 // SPDX-License-Identifier: GPL-3.0-or-later
@@ -9,7 +12,7 @@
 #include <memory>
 #include <mutex>
 #include <optional>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <assert.h>
 
 #include "common/bit_field.h"
@@ -158,7 +161,7 @@ private:
     std::list<std::shared_ptr<Handle>> unmap_queue{};
     std::mutex unmap_queue_lock{}; //!< Protects access to `unmap_queue`
 
-    std::unordered_map<Handle::Id, std::shared_ptr<Handle>>
+    ankerl::unordered_dense::map<Handle::Id, std::shared_ptr<Handle>>
         handles{};           //!< Main owning map of handles
     std::mutex handles_lock; //!< Protects access to `handles`
 
diff --git a/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.h b/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.h
index c9a6737ba9..7d50fd4c33 100644
--- a/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.h
+++ b/src/core/hle/service/nvdrv/devices/nvhost_as_gpu.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: 2021 yuzu Emulator Project
@@ -13,7 +13,7 @@
 #include <memory>
 #include <mutex>
 #include <optional>
-#include <unordered_set>
+#include <ankerl/unordered_dense.h>
 #include <vector>
 
 #include "common/address_space.h"
@@ -113,7 +113,7 @@ private:
     };
     static_assert(sizeof(IoctlRemapEntry) == 20, "IoctlRemapEntry is incorrect size");
 
-    std::unordered_set<s64_le> map_buffer_offsets{};
+    ankerl::unordered_dense::set<s64_le> map_buffer_offsets{};
 
     struct IoctlMapBufferEx {
         MappingFlags flags{}; // bit0: fixed_offset, bit2: cacheable
diff --git a/src/core/hle/service/nvdrv/devices/nvhost_gpu.h b/src/core/hle/service/nvdrv/devices/nvhost_gpu.h
index b8854aab95..c29231dc0c 100644
--- a/src/core/hle/service/nvdrv/devices/nvhost_gpu.h
+++ b/src/core/hle/service/nvdrv/devices/nvhost_gpu.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -210,7 +210,7 @@ private:
     NvCore::SyncpointManager& syncpoint_manager;
     NvCore::NvMap& nvmap;
     std::shared_ptr<Tegra::Control::ChannelState> channel_state;
-    std::unordered_map<DeviceFD, NvCore::SessionId> sessions;
+    ankerl::unordered_dense::map<DeviceFD, NvCore::SessionId> sessions;
     u32 channel_syncpoint;
     std::mutex channel_mutex;
 
diff --git a/src/core/hle/service/nvdrv/devices/nvhost_nvdec_common.h b/src/core/hle/service/nvdrv/devices/nvhost_nvdec_common.h
index 63e6377603..6b66a0d28d 100644
--- a/src/core/hle/service/nvdrv/devices/nvhost_nvdec_common.h
+++ b/src/core/hle/service/nvdrv/devices/nvhost_nvdec_common.h
@@ -1,10 +1,13 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
 #include <deque>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <vector>
 
 #include "common/common_types.h"
@@ -128,7 +131,7 @@ protected:
     NvCore::NvMap& nvmap;
     NvCore::ChannelType channel_type;
     std::array<u32, MaxSyncPoints> device_syncpoints{};
-    std::unordered_map<DeviceFD, NvCore::SessionId> sessions;
+    ankerl::unordered_dense::map<DeviceFD, NvCore::SessionId> sessions;
 };
 }; // namespace Devices
 } // namespace Service::Nvidia
diff --git a/src/core/hle/service/nvdrv/devices/nvmap.h b/src/core/hle/service/nvdrv/devices/nvmap.h
index d07d85f888..19c5b479df 100644
--- a/src/core/hle/service/nvdrv/devices/nvmap.h
+++ b/src/core/hle/service/nvdrv/devices/nvmap.h
@@ -1,10 +1,13 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
 #include <memory>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <vector>
 #include "common/common_funcs.h"
 #include "common/common_types.h"
@@ -115,7 +118,7 @@ private:
 
     NvCore::Container& container;
     NvCore::NvMap& file;
-    std::unordered_map<DeviceFD, NvCore::SessionId> sessions;
+    ankerl::unordered_dense::map<DeviceFD, NvCore::SessionId> sessions;
 };
 
 } // namespace Service::Nvidia::Devices
diff --git a/src/core/hle/service/nvdrv/nvdrv.h b/src/core/hle/service/nvdrv/nvdrv.h
index b76f81e594..329ac91c41 100644
--- a/src/core/hle/service/nvdrv/nvdrv.h
+++ b/src/core/hle/service/nvdrv/nvdrv.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2021 yuzu Emulator Project
 // SPDX-FileCopyrightText: 2021 Skyline Team and Contributors
 // SPDX-License-Identifier: GPL-3.0-or-later
@@ -9,7 +12,7 @@
 #include <memory>
 #include <span>
 #include <string>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include "common/common_types.h"
 #include "core/hle/service/kernel_helpers.h"
@@ -100,7 +103,7 @@ private:
     /// Id to use for the next open file descriptor.
     DeviceFD next_fd = 1;
 
-    using FilesContainerType = std::unordered_map<DeviceFD, std::shared_ptr<Devices::nvdevice>>;
+    using FilesContainerType = ankerl::unordered_dense::map<DeviceFD, std::shared_ptr<Devices::nvdevice>>;
     /// Mapping of file descriptors to the devices they reference.
     FilesContainerType open_files;
 
@@ -108,7 +111,7 @@ private:
 
     EventInterface events_interface;
 
-    std::unordered_map<std::string, std::function<FilesContainerType::iterator(DeviceFD)>> builders;
+    ankerl::unordered_dense::map<std::string, std::function<FilesContainerType::iterator(DeviceFD)>> builders;
 };
 
 void LoopProcess(Core::System& system);
diff --git a/src/core/hle/service/nvnflinger/hos_binder_driver_server.h b/src/core/hle/service/nvnflinger/hos_binder_driver_server.h
index f4b4060115..b66f1776b0 100644
--- a/src/core/hle/service/nvnflinger/hos_binder_driver_server.h
+++ b/src/core/hle/service/nvnflinger/hos_binder_driver_server.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -5,7 +8,7 @@
 
 #include <memory>
 #include <mutex>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include "common/common_types.h"
 #include "core/hle/service/nvnflinger/binder.h"
@@ -36,8 +39,8 @@ private:
 
     mutable std::mutex lock;
     s32 last_id = 0;
-    std::unordered_map<s32, std::shared_ptr<android::IBinder>> binders;
-    std::unordered_map<s32, RefCounts> refcounts;
+    ankerl::unordered_dense::map<s32, std::shared_ptr<android::IBinder>> binders;
+    ankerl::unordered_dense::map<s32, RefCounts> refcounts;
 };
 
 } // namespace Service::Nvnflinger
diff --git a/src/core/hle/service/olsc/daemon_controller.h b/src/core/hle/service/olsc/daemon_controller.h
index 4a4b89317b..fc7dd7bbcb 100644
--- a/src/core/hle/service/olsc/daemon_controller.h
+++ b/src/core/hle/service/olsc/daemon_controller.h
@@ -4,7 +4,7 @@
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include "common/uuid.h"
 #include "core/hle/service/cmif_types.h"
@@ -54,10 +54,10 @@ private:
         }
     };
 
-    std::unordered_map<AppKey, bool, AppKeyHash> app_auto_transfer_{};
-    std::unordered_map<Common::UUID, bool> global_auto_upload_{};
-    std::unordered_map<Common::UUID, bool> global_auto_download_{};
-    std::unordered_map<AppKey, u8, AppKeyHash> autonomy_task_status_{};
+    ankerl::unordered_dense::map<AppKey, bool, AppKeyHash> app_auto_transfer_{};
+    ankerl::unordered_dense::map<Common::UUID, bool> global_auto_upload_{};
+    ankerl::unordered_dense::map<Common::UUID, bool> global_auto_download_{};
+    ankerl::unordered_dense::map<AppKey, u8, AppKeyHash> autonomy_task_status_{};
 };
 
 } // namespace Service::OLSC
diff --git a/src/core/hle/service/sm/sm.h b/src/core/hle/service/sm/sm.h
index d5f372b97d..039d53ebf8 100644
--- a/src/core/hle/service/sm/sm.h
+++ b/src/core/hle/service/sm/sm.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -10,7 +10,7 @@
 #include <memory>
 #include <mutex>
 #include <string>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 #include <concepts>
 
 #include "core/hle/kernel/k_port.h"
@@ -97,8 +97,8 @@ private:
 
     /// Map of registered services, retrieved using GetServicePort.
     std::mutex lock;
-    std::unordered_map<std::string, SessionRequestHandlerFactory> registered_services;
-    std::unordered_map<std::string, Kernel::KClientPort*> service_ports;
+    ankerl::unordered_dense::map<std::string, SessionRequestHandlerFactory> registered_services;
+    ankerl::unordered_dense::map<std::string, Kernel::KClientPort*> service_ports;
 
     /// Kernel context
     Kernel::KernelCore& kernel;
diff --git a/src/core/hle/service/vi/conductor.h b/src/core/hle/service/vi/conductor.h
index 6dd105dd40..59eb2fd022 100644
--- a/src/core/hle/service/vi/conductor.h
+++ b/src/core/hle/service/vi/conductor.h
@@ -1,10 +1,13 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once
 
 #include <memory>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include "common/common_types.h"
 #include "common/polyfill_thread.h"
@@ -45,7 +48,7 @@ private:
 private:
     Core::System& m_system;
     Container& m_container;
-    std::unordered_map<u64, VsyncManager> m_vsync_managers;
+    ankerl::unordered_dense::map<u64, VsyncManager> m_vsync_managers;
     std::shared_ptr<Core::Timing::EventType> m_event;
     Common::Event m_signal;
     std::jthread m_thread;
diff --git a/src/core/launch_timestamp_cache.cpp b/src/core/launch_timestamp_cache.cpp
index 95b6bc8c41..217b3f28da 100644
--- a/src/core/launch_timestamp_cache.cpp
+++ b/src/core/launch_timestamp_cache.cpp
@@ -8,7 +8,7 @@
 #include <mutex>
 #include <sstream>
 #include <string>
-#include <unordered_map>
+#include <ankerl/unordered_dense.h>
 
 #include <fmt/format.h>
 #include <nlohmann/json.hpp>
@@ -21,8 +21,8 @@
 namespace Core::LaunchTimestampCache {
 namespace {
 
-using CacheMap = std::unordered_map<u64, s64>;
-using CountMap = std::unordered_map<u64, u64>;
+using CacheMap = ankerl::unordered_dense::map<u64, s64>;
+using CountMap = ankerl::unordered_dense::map<u64, u64>;
 
 std::mutex g_mutex;
 CacheMap g_cache;