diff --git a/src/ac6_texture_overrides.cpp b/src/ac6_texture_overrides.cpp
index 0bdb2270..cf9d2785 100644
--- a/src/ac6_texture_overrides.cpp
+++ b/src/ac6_texture_overrides.cpp
@@ -19,11 +19,13 @@
 
 REXCVAR_DECLARE(std::string, user_data_root);
 
-REXCVAR_DEFINE_BOOL(ac6_texture_swaps_enabled, true, "AC6/TextureSwaps",
-                    "Enable AC6 texture dump and replacement support");
+REXCVAR_DEFINE_BOOL(ac6_texture_swaps_enabled, false, "AC6/TextureSwaps",
+                    "Enable AC6 texture dump and replacement support (default off: the "
+                    "replacement lookup currently checks the filesystem on every texture "
+                    "upload, which can cause frame stutters; enable for texture modding)");
 REXCVAR_DEFINE_BOOL(ac6_texture_swaps_dump_enabled, false, "AC6/TextureSwaps",
                     "Dump host-ready textures to the user-data texture dump folder");
-REXCVAR_DEFINE_BOOL(ac6_texture_swaps_replace_enabled, true, "AC6/TextureSwaps",
+REXCVAR_DEFINE_BOOL(ac6_texture_swaps_replace_enabled, false, "AC6/TextureSwaps",
                     "Load matching replacement DDS files from the user-data texture override folders");
 REXCVAR_DEFINE_STRING(ac6_texture_swaps_dump_dir, "texture_dumps", "AC6/TextureSwaps",
                       "User-data subdirectory that stores dumped texture DDS files and metadata");
diff --git a/src/main.cpp b/src/main.cpp
index f0c63723..a90c54d6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -32,6 +32,8 @@ REXCVAR_DECLARE(bool, guest_vblank_sync_to_refresh);
 REXCVAR_DECLARE(bool, host_present_from_non_ui_thread);
 #if REX_HAS_D3D12
 REXCVAR_DECLARE(bool, d3d12_allow_variable_refresh_rate_and_tearing);
+REXCVAR_DECLARE(bool, d3d12_low_latency_swap_chain);
+REXCVAR_DECLARE(int32_t, d3d12_max_frame_latency);
 #endif
 REXCVAR_DECLARE(bool, vfetch_index_rounding_bias);
 REXCVAR_DECLARE(int32_t, video_mode_width);
@@ -114,11 +116,17 @@ void ApplyAc6DefaultSettings() {
         REXCVAR_SET(guest_vblank_sync_to_refresh, true);
     }
     if (!rex::cvar::HasNonDefaultValue("host_present_from_non_ui_thread")) {
-        REXCVAR_SET(host_present_from_non_ui_thread, false);
+        REXCVAR_SET(host_present_from_non_ui_thread, true);
     }
 #if REX_HAS_D3D12
     if (!rex::cvar::HasNonDefaultValue("d3d12_allow_variable_refresh_rate_and_tearing")) {
-        REXCVAR_SET(d3d12_allow_variable_refresh_rate_and_tearing, false);
+        REXCVAR_SET(d3d12_allow_variable_refresh_rate_and_tearing, true);
+    }
+    if (!rex::cvar::HasNonDefaultValue("d3d12_low_latency_swap_chain")) {
+        REXCVAR_SET(d3d12_low_latency_swap_chain, true);
+    }
+    if (!rex::cvar::HasNonDefaultValue("d3d12_max_frame_latency")) {
+        REXCVAR_SET(d3d12_max_frame_latency, 1);
     }
 #endif
     if (!rex::cvar::HasNonDefaultValue("vfetch_index_rounding_bias")) {