I can tell you that I went from a 9700K clocked at 5GHz to a 12900K running stock with the most-used p-cores at 4.9GHz and I’ve seen a significant uplift in main thread performance (lower thread times) and am essentially never CPU-limited any more. To be fair, I was mostly GPU-limited before too. I absolutely saw a significant improvement in FPS in complex scenery, though. I also think that moving to DDR5 RAM had an effect there. But that’s just my experience and honestly, YMMV.
There’s no silver bullet to be had.