Problem after few weeks (laggy, freez, black background..)

I used OCLP to install Sonoma on end 2012 MacBook pro. Everything was fine in the first weeks but now I have a lot of trouble like:

  • after login the background image is just black, but background is set
  • it's getting really slow after 1-2 mins... So I can't even type anything... It's like 500ms and higher response time
  • activity monitor doesn't show any high load processes

Does anyone know what to do here?

Author: @ka10r