My laptop started doing that laggy thing again, which is so painfully frustrating because to fix it you have to slog through the unresponsive controls.
I found a thing that suggested that xserver-xorg-video-intel can be the cause, the details of it say it is discouraged, so I removed it and rebooted, and I seem to be okay.
...except that when I did the apt show xserver-xorg-video-intel command again, it was still there. 😕
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