QtWebEngine Locked at 60FPS Despite Detecting 144Hz Displays

AelecTi

Windows 10，Qt 6.6.1

To reproduce the issue, compile and install qtwebengine (version 6.6.1#1) using vcpkg.

vcpkg install qtwebengine[geolocation,proprietary-codecs,spellchecker,webchannel,default-features]:x64-windows --editable --x-buildtrees-root="C:\qt"

After installation, compile and run the following code:

#include <QApplication>
#include <QWebEngineView>

int main(int argc, char *argv[])
{
   QApplication app(argc, argv);

   QWebEngineView view;

   // Check the refresh rate
   view.setUrl(QUrl("https://vsynctester.com")); 

   view.show();

   return app.exec();
}

The test results show that the refresh rate of QtWebEngineView is capped at 60 FPS.

When I set the URL to chrome://gpu/, it shows that Chromium correctly detects my 144Hz monitor, but for some reason, it's still limiting the max refresh rate to 60.

I've tried using qputenv("QTWEBENGINE_CHROMIUM_FLAGS", "--ignore-gpu-blacklist --enable-gpu --vsync-interval=7 --max-gum-fps=144"); with no luck.

Also, using qputenv("QTWEBENGINE_CHROMIUM_FLAGS", "--disable-frame-rate-limit"); pushes the frames beyond 500, but it maxes out CPU resources.

Any ideas on how to fix this?