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Hmm. Even with the fix it didn't look very smooth even if it is a lot better. I wonder if that is due to the recording, or due to the mouse settings (mouse poll rate and acceleration settings are very impactful on smoothness), due to X or the toolkit, or due to it not being as good as it can be.

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I think issue is the screen capture tool or a framerate mismatch in transcoding. The video is 59fps, but the mouse cursor only updates every few frames. Usually it's every other frame, but sometimes it takes three frames or more to update, and sometimes it updates in two or more consecutive frames. On most of the frames where the cursor moves, the window size also changes.

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