diff --git a/inc/dd.h b/inc/dd.h
index bb36710..48dc680 100644
--- a/inc/dd.h
+++ b/inc/dd.h
@@ -137,6 +137,7 @@ typedef struct CNCDDRAW
     HCURSOR old_cursor;
     int show_cursor_count;
     BOOL novidmem;
+    BOOL fpupreserve;
     BOOL accurate_timers;
     BOOL resizable;
     BOOL nonexclusive;
diff --git a/src/config.c b/src/config.c
index 8fdaca6..928e95c 100644
--- a/src/config.c
+++ b/src/config.c
@@ -45,6 +45,7 @@ void cfg_load()
     g_ddraw->d3d9linear = cfg_get_bool("d3d9linear", TRUE);
     g_ddraw->gdilinear = cfg_get_bool("gdilinear", FALSE);
     g_ddraw->resolutions = cfg_get_int("resolutions", RESLIST_NORMAL);
+    g_ddraw->fpupreserve = cfg_get_bool("fpupreserve", FALSE);
     cfg_get_string("screenshotdir", ".\\Screenshots\\", g_ddraw->screenshot_dir, sizeof(g_ddraw->screenshot_dir));
 
     if (g_ddraw->locktopleft)
@@ -337,6 +338,10 @@ static void cfg_create_ini()
             "; Note: Disables upscaling if a child window was detected\n"
             "fixchilds=2\n"
             "\n"
+            "; Set the precision for Direct3D9 floating-point calculations to the precision used by the calling thread\n"
+            "; Note: Enable this if there are desyncs in online games\n"
+            "fpupreserve=false\n"
+            "\n"
             "\n"
             "\n"
             "; ### Hotkeys ###\n"
@@ -648,6 +653,14 @@ static void cfg_create_ini()
             "renderer=gdi\n"
             "hook=2\n"
             "\n"
+            "; Dune 2000\n"
+            "[dune2000]\n"
+            "fpupreserve=false\n"
+            "\n"
+            "; Dune 2000 - CnCNet\n"
+            "[dune2000-spawn]\n"
+            "fpupreserve=false\n"
+            "\n"
             "; Dragon Throne: Battle of Red Cliffs\n"
             "[AdSanguo]\n"
             "maxgameticks=60\n"
diff --git a/src/render_d3d9.c b/src/render_d3d9.c
index f640fb0..06f6185 100644
--- a/src/render_d3d9.c
+++ b/src/render_d3d9.c
@@ -71,11 +71,11 @@ BOOL d3d9_create()
             g_d3d9.params.BackBufferCount = 1;
 
             DWORD behavior_flags[] = {
-                D3DCREATE_HARDWARE_VERTEXPROCESSING | D3DCREATE_PUREDEVICE,
-                D3DCREATE_HARDWARE_VERTEXPROCESSING | D3DCREATE_PUREDEVICE,
-                D3DCREATE_HARDWARE_VERTEXPROCESSING,
-                D3DCREATE_MIXED_VERTEXPROCESSING,
-                D3DCREATE_SOFTWARE_VERTEXPROCESSING,
+                D3DCREATE_MULTITHREADED | D3DCREATE_HARDWARE_VERTEXPROCESSING | D3DCREATE_PUREDEVICE,
+                D3DCREATE_MULTITHREADED | D3DCREATE_HARDWARE_VERTEXPROCESSING | D3DCREATE_PUREDEVICE,
+                D3DCREATE_MULTITHREADED | D3DCREATE_HARDWARE_VERTEXPROCESSING,
+                D3DCREATE_MULTITHREADED | D3DCREATE_MIXED_VERTEXPROCESSING,
+                D3DCREATE_MULTITHREADED | D3DCREATE_SOFTWARE_VERTEXPROCESSING,
             };
 
             for (int i = 0; i < sizeof(behavior_flags) / sizeof(behavior_flags[0]); i++)
@@ -86,7 +86,7 @@ BOOL d3d9_create()
                         D3DADAPTER_DEFAULT,
                         D3DDEVTYPE_HAL,
                         g_ddraw->hwnd,
-                        D3DCREATE_MULTITHREADED | behavior_flags[i],
+                        behavior_flags[i] | (g_ddraw->fpupreserve ? D3DCREATE_FPU_PRESERVE : 0),
                         &g_d3d9.params,
                         &g_d3d9.device)))
                     return g_d3d9.device && d3d9_create_resouces() && d3d9_set_states();