well I never had a single problem with Cyberpunk @ max settings, not 1, so I never experienced any of the "problems" other people were having. Lag doesn't always have to do with the GPU; CPU, RAM, or Disk problems can contribute. I've also never had any problems getting this game to run. The only problems were having it be too dark before the flashlight, and poor clipping getting into the store, but first of all its a BETA and probably has only 1 or 2 people working on it.
Any mechanical problems, any software problems, any OS issues, any temp issues, cheap parts, and poor ventilation are just a few things that can cause lag.
but, I have a double radiator, 10 noctua fan, liquid system with much of the windows 10 trash turned off