--- gfx_sdl2.c	2024-05-28 10:43:53
+++ gfx_sdl2.c.patched	2024-05-28 10:43:40
@@ -54,9 +54,11 @@ static const int frame_time = 1000 / (2 * FRAMERATE);
 // whether to use timer for frame control
 static bool use_timer = true;
 // time between consequtive game frames
-static const int frame_time = 1000 / (2 * FRAMERATE);
+static const int frame_time_60FPS = 1000 / (2 * FRAMERATE);
+static const int frame_time_30FPS = 1000 / FRAMERATE;
 
 
+
 const SDL_Scancode windows_scancode_table[] = {
   /*  0                        1                            2                         3                            4                     5                            6                            7  */
   /*  8                        9                            A                         B                            C                     D                            E                            F  */
@@ -141,6 +143,9 @@ static inline void gfx_sdl_set_vsync(const bool enable
 }
 
 static inline void gfx_sdl_set_vsync(const bool enabled) {
+    use_timer = true;
+    SDL_GL_SetSwapInterval(0);
+    return;
 #ifdef TARGET_SWITCH
     use_timer = false;
         SDL_GL_SetSwapInterval(1);
@@ -357,9 +362,15 @@ static inline void sync_framerate_with_timer(void) {
     // get base timestamp on the first frame (might be different from 0)
     if (last_time == 0) last_time = SDL_GetTicks();
     const int elapsed = SDL_GetTicks() - last_time;
-    if (elapsed < frame_time)
-        SDL_Delay(frame_time - elapsed);
-    last_time += frame_time;
+    if(config60FPS){
+        if (elapsed < frame_time_60FPS)
+            SDL_Delay(frame_time_60FPS - elapsed);
+        last_time += frame_time_60FPS;
+    }else{
+        if (elapsed < frame_time_30FPS)
+            SDL_Delay(frame_time_30FPS - elapsed);
+        last_time += frame_time_30FPS;
+    }
 }
 
 static void gfx_sdl_swap_buffers_begin(void) {