I can report the beta helped. HWiNFO running without any settings changed, out of the box, on stable version the framerate would be stuck on some old value whenever my game was focused. On beta this no longer occurs.
(single Nvidia GPU with driver 552.44, Windows 11 23H2)
I did the test on my 3700X with an Asrock X570 Phantom Gaming 4. Getting somewhere between 82% and 85% during the Cinebench R20 load. I haven't done any changes to how CPU runs in the BIOS, the only thing I did is overclock RAM.
Either way, that's still well above 5% of deviation...