Great news (for my old MBP4,1 anyway) - got the 10.15.4 beta 1 up and running with NVidia GT full acceleration!
Does that mean that I can expect some performance improvements with 10.15.4? I am on 10.15.2 on my MBP 4,1 now (dosdude patch), quite well and without issues. But if there will be improvements I may decide to push forward to the newer version, so what upgrade method will be necessary to use?