After update from 2018 to 2019 version EVERYTHING in Photoshop LAGS - cropping, content aware filling, simplest actions, etc etc - EVERYTHING. No improvements in current version 20.0.4. Had to reinstall 2018 version which runs flawless and fast. MacOS Mojave 32Gb RAM IntelCore i7
You are not the only one! Just wait, something will go right and then something else will brake. Issues with [copy] [paste] are driving me crazy. Presets NOT working. The slowness is also a problem, especially when loading a file or saving it, from my standalone drive. Now, I did find a workaround, not a fix; place the file on the PC's hard drive and it will load and save fast (for me anyway). I do the files back on the remote hard drive where they belong. I'm going to stick with Adobe for now, but I have put time and money into trying to get PS to work, so I can smile again. Adobe knows and so do we. Good Luck!
Can you be a bit more specific about everything being slow? Is the entire application running slow or just certain operations? If the entire application is running slow, can you do me a favor and check Activity Monitor to see what processes (besides Photoshop) are using CPU at the same time Photoshop is running?