Changed to plat_delay_ms() according to tneukom's latest suggestion.

src/qt/qt_main.cpp

@@ -149,9 +149,6 @@ main_thread_fn()
             if (dopause)
                 ack_pause();
 
-#ifdef Q_OS_WINDOWS
-            timeBeginPeriod(1);
-#endif
             plat_delay_ms(1);
         }
     }
@@ -160,9 +157,6 @@ main_thread_fn()
     for (uint8_t i = 1; i < GFXCARD_MAX; i ++) {
         if (gfxcard[i]) {
             ui_deinit_monitor(i);
-#ifdef Q_OS_WINDOWS
-            timeBeginPeriod(1);
-#endif
             plat_delay_ms(500);
         }
     }

src/qt/qt_ui.cpp

@@ -59,7 +59,15 @@ extern "C" {
 void
 plat_delay_ms(uint32_t count)
 {
+#ifdef Q_OS_WINDOWS
+    // On Win32 the accuracy of Sleep() depends on the timer resolution, which can be set by calling timeBeginPeriod
+    // https://learn.microsoft.com/en-us/windows/win32/api/timeapi/nf-timeapi-timebeginperiod
+    timeBeginPeriod(1);
+    Sleep(count);
+    timeEndPeriod(1);
+#else
     QThread::msleep(count);
+#endif
 }
 
 wchar_t *