Dngallagher wrote:
Does not surprise me. May be related to the video hardware/drivers. Mojave may put more reliance on Metal vs Open GL.
I am running Mojave fine on my late 2015 iMac with a 2GB Radeon Video card and 5k display & 32 Gb ram. Have seen no slow downs with Photoshop yet, and I am in Photoshop daily.
If you were still running Mojave, there might be some performance settings specific to Photoshop that could help get rid of some slowdowns.
Thanks Donald, I tried changing the settings with no improvement. I'm OK with going back for now. There might be a fix coming down the line. This is the first time an update didn't work out. Might get a new machine next year.