Painfully slow after every update

Every time I update macOS, the iMac restarts and is so slow that I can only assume the GPU is not working. It takes me about 10 minutes to move the mouse cursor to the password box on the login screen and type it in and then when I finally get to the Desktop it’s still unusable slow (maybe 1 frame per second) and OCLP pops up saying “you’re running without root patches” and it runs the patcher.

Is there no way to get ahead of this before updating? I don’t think I’m doing anything wrong: any time there’s an update, I update OCLP and run everything possible (except root patching as that won’t run with a pending update). OCLP even detects when an update is downloading and asks to do something (can’t remember the exact message but something like “OCLP has detected an update is downloading - would you like to [perform some action]?” which seems to be advisable so I say yes.

Am I doing something wrong?

Author: @twistsouth