Temporarily reverted main thread delays to the old way to reduce CPU usage until we figure out a better way that gives more accuracy at comparably reduced CPU usage.

src/qt/qt_main.cpp

@@ -120,10 +120,7 @@ main_thread_fn()
             }
         } else {
             /* Just so we dont overload the host OS. */
-            if (drawits < -1 || dopause)
-                std::this_thread::sleep_for(std::chrono::milliseconds(1));
-            else
-                std::this_thread::yield();
+            std::this_thread::sleep_for(std::chrono::milliseconds(1));
         }
 
         /* If needed, handle a screen resize. */

src/win/Makefile.mingw

@@ -758,7 +758,11 @@ ifdef EXOBJ
 OBJ		+= $(EXOBJ)
 endif
 
+ifeq ($(OPENAL), y)
+LIBS		:= -mwindows -lopenal -lcomctl32 -lSDL2 -limagehlp -ldinput8 -ldxguid -ldxerr8 -luser32 -lgdi32 -lwinmm -limm32 -lole32 -loleaut32 -lshell32 -lversion -luuid
+else
 LIBS		:= -mwindows -lcomctl32 -lSDL2 -limagehlp -ldinput8 -ldxguid -ldxerr8 -luser32 -lgdi32 -lwinmm -limm32 -lole32 -loleaut32 -lshell32 -lversion -luuid
+endif
 
 ifeq ($(RTMIDI), y)
  SNDOBJ		+= midi_rtmidi.o

src/win/win.c

@@ -549,8 +549,7 @@ main_thread(void *param)
 			frames = 0;
 		}
 	} else	/* Just so we dont overload the host OS. */
-		Sleep((drawits < -1) ? 1 : 0);
-		// Sleep(1);
+		Sleep(1);
 
 	/* If needed, handle a screen resize. */
 	if (!atomic_flag_test_and_set(&doresize) && !video_fullscreen && !is_quit) {