I was having the same issue on my iMac (Intel, 2019) after upgrading to Monterey. Lagging apps, UI issues, etc. I read Sherman13's solution of turning off the screensaver, and immediately after I turned that off, EVERYTHING sped back up to normal! No issues, lags or delays anymore. Nice and snappy again.
TalkerTalker
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution