Menu throttling adjustments

menu/menu_driver.c

@@ -6783,7 +6783,8 @@ void menu_driver_toggle(
 
       /* Menu should always run with vsync on and
        * a video swap interval of 1 */
-      if (current_video->set_nonblock_state)
+      if (     settings->bools.menu_throttle_framerate
+            && current_video->set_nonblock_state)
       {
          current_video->set_nonblock_state(
                video_driver_data,

runloop.c

@@ -7145,6 +7145,25 @@ static enum runloop_state_enum runloop_check_state(
       float fastforward_ratio = runloop_get_fastforward_ratio(settings,
             &runloop_st->fastmotion_override.current);
 
+      /* Sleep half frame time when menu pause is enabled to
+       * keep framerate under reasonable levels without vsync, but
+       * sleep regardless of vsync to keep CPU usage and temperature
+       * lower with GL when vsync is on */
+      if (settings->bools.menu_pause_libretro)
+      {
+         float refresh_rate = video_driver_get_refresh_rate();
+         uint8_t sleep      = 0;
+
+         if (refresh_rate == 0.0f)
+            refresh_rate = settings->floats.video_refresh_rate;
+
+         if (refresh_rate > 0)
+         {
+            sleep = 1000000 / refresh_rate / 2 / 1000;
+            retro_sleep(sleep);
+         }
+      }
+
       if (!settings->bools.menu_throttle_framerate && !fastforward_ratio)
          return RUNLOOP_STATE_MENU_ITERATE;