How to make Zorin OS faster / optimize CPU usage on old-ish laptop

General Help
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Thanks @Ponce-De-Leon, please see answers below:

  1. Yes (although, as I posted in this other thread, I would like to reactivate Secure boot now if that's not going to mess up with things)
  2. Yes
  3. I tried both and X11 seemed slightly worse so I went back to Wayland.
  4. Yes...

I am hoping there is some way to optimize CPU usage in the Core version so I don't have to reinstall another version from scratch..

Thanks!