It started back in January 2020 with that release and hasn't gotten any better. I've tried all the suggested performance tweeks. I've emptied the cache, rebooted, gave Photoshop more memory, gave it less memory, tweeked GPU settings, reset to factory settings, etc. etcm but it is still laggy and borderline unusable.
Edits that took less than 5 minutes a few years ago are taking 30 minutes or more.
Can we have Photoshop 2019 back until these problems get worked out?
Bug, Crash or freeze, Mac, Performance, Problem or error
At some point you may want to look at your computer setup and confirm that they meet or (preferably) exceed the recommended system requirements. When you are ready to purchase a new system, be sure to run the specs by us first.