src/java.desktop/windows/classes/sun/awt/windows/WToolkit.java

*** 301,313 ****
  
      @Override
      public void run() {
          AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
              Thread.currentThread().setContextClassLoader(null);
              return null;
          });
!         Thread.currentThread().setPriority(Thread.NORM_PRIORITY + 1);
          boolean startPump = init();
  
          if (startPump) {
              registerShutdownHook();
          }
--- 301,314 ----
  
      @Override
      public void run() {
          AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
              Thread.currentThread().setContextClassLoader(null);
+             Thread.currentThread().setPriority(Thread.NORM_PRIORITY + 1);
              return null;
          });
! 
          boolean startPump = init();
  
          if (startPump) {
              registerShutdownHook();
          }