Normally, I work on a Mac, but I installed Illustrator on a PC, and the mouse lag was horrendous. If I moved the mouse in a circle quickly, I could see about six instances of the pointer on screen. Sometimes, while I would do that, the lag would suddenly go away and I got a full 144 fps. But as soon as I started moving the mouse normally again, the lag returned. If an object is selected, I get a full 144 fps as well. I tried turning off GPU acceleration and the lag went away completely. So... yay, but I'm now I've got no animated zoom. This needs to be looked into.
Illustrator 26.3.1 (64 bit)
Windows 11
GPU: Gigabyte RTX 2080
Happens with two different mice, so that's not the issue.
Sorry to hear about this experience. I hope the problem is resolved by now. If not, kindly try updating the drivers for your GPU as suggested by GianVitulano and check if it helps.
Also, try resetting Illustrator's preferences by following the steps shared in this article (https://helpx.adobe.com/illustrator/kb/troubleshoot-preference-issues.html) and sharing your observations. Disclaimer: Please note that resetting preferences will remove all custom settings, and Illustrator will launch with the defaults. You may take a backup of these settings from the location mentioned in the article.
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