[Boot2Qt] The mouse cursor becomes very laggy while selecting the option 'Pick Screen Color' from QColorDialog

Linux Ubuntu 22.04 
Qt Creator 12.0.0
Device: Raspberry Pi4 64 bit 
Qt ver.: (Qt 6.7.0 snapshot from dev/ 2023-11-27)

Steps to reproduce:

1. Open widgets dialog example - https://doc.qt.io/qt-6/qtwidgets-dialogs-standarddialogs-example.html
2. Run it on Raspberry Pi 4 64bit with eglfs platform.
3. Open color dialog.
4. Select 'Pick Screen Color'
5. Move the cursor.

Expected: The screen color can be picked smoothly.

Actual: The cursor becomes very laggy and slow.

Reproducibility:  100%