diff --git a/main_x11.cpp b/main_x11.cpp
--- a/main_x11.cpp
+++ b/main_x11.cpp
@@ -45,6 +45,7 @@
 #include <QPushButton>
 #include <QVBoxLayout>
 #include <QX11Info>
+#include <QSurfaceFormat>
 
 // system
 #ifdef HAVE_UNISTD_H
@@ -416,6 +417,9 @@
 
     KWin::Application::createAboutData();
     KQuickAddons::QtQuickSettings::init();
+    QSurfaceFormat format = QSurfaceFormat::defaultFormat();
+    format.setSwapInterval(0);
+    QSurfaceFormat::setDefaultFormat(format);
 
     QCommandLineOption replaceOption(QStringLiteral("replace"), i18n("Replace already-running ICCCM2.0-compliant window manager"));