Each time I update photoshop, it seems to run slower and less stable. I've tried everything I can think of and find. I've tried optimization steps, I've given it more RAM, I've tried working with smaller projects. Nothing has worked. It seems to run slightly better when I roll it back to an older installation of Photoshop, but it still runs exponentially slower than it should. Any suggestions? I'm running on a laptop with a Ryzen 9 and 16 gigs of RAM.
Try trashing your Photoshop preferences. Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) immediately after launching Photoshop. You will be prompted to delete the current settings.
(Mac OS only) Open the Preferences folder in the Library folder, and drag the Adobe Photoshop CS Settings folder to the Trash.
This action only affects the items found in the preferences dialog box. Numerous program settings are stored in the Adobe Photoshop Preferences file, including general display options, file-saving options, performance options, cursor options, transparency options, type options, and options for plug‑ins and scratch disks. Brushes (and lots of other setting) are not affected by the above instructions for deleting preferences. You may wish to make a screen capture of the settings in the Preferences dialog to reset them prior to deleting of this file.
Quite difficult to understand that if you downgrade Photoshop, it stll runs slower then before! What did change in the meanwhile? Installs and upgrades? Trashing the preferences would effectively be a good starting point.
One of the times, when I downgraded it, Photoshop actually ran faster. I think it had something to do with my computers graphics card being recognized within one but not the other.
It wasn't by much, but it was enough to be usable