I have also noticed this problem and wanted to add some more info to demonstrate the issue. Switching to the QT5 build does fix the problem.
For comparison, check these two videos comparing the qt6 and qt5 build. In the qt6 video, notice how slow the UI responds when mousing over elements and how long it takes for the card to update compared to the review buttons at the bottom bar.
QT6: Anki 2.1.60 QT6 - YouTube
QT5: Anki 2.1.60 QT5 - YouTube
C:\Users\Lewis>type %appdata%\anki2\gldriver
angle
C:\Users\Lewis>type %appdata%\anki2\gldriver6
angle