--- src/gui/kernel/qclipboard_x11.cpp.sav	2014-04-25 09:52:03.855693228 +0200

+++ src/gui/kernel/qclipboard_x11.cpp	2014-04-25 09:51:58.038693777 +0200

@@ -548,7 +548,8 @@ bool QX11Data::clipboardWaitForEvent(Win

                 return false;

             XSync(X11->display, false);

-            usleep(50000);

+            if (!XPending(X11->display))

+                usleep(5000);

             now.start();