Tool previews, such as the stamp brush preview, become laggy after hardware acceleration is turned on, even if it's turned back off.
Restarting Tiled after turning hardware acceleration off and not turning it back on again "fixes" the issue, and the tool previews follow the mouse cursor without delay again.
The lag is slight, but it's enough to be quite annoying. It feels like it's perhaps a frame or so behind.

In this GIF, I first have a freshly started Tiled with no hardware acceleration, there's no lag. Then, I turn on hardware acceleration and the lag appears. Then, I turn it off and the lag persists.

Encountered on Tiled 1.9.1 and 2023.02.17 (Qt6) on Win10 x64.