That describes what I've seen. When I first compared 2020 and 2024 in as apples-to-apples a way as I could, it seemed like 2024's frame rate was about a third lower than 2020's. This was on a 7900 XTX with 24 gigs of VRAM.

I'm waiting for SU4 before I get back into it...

VR situation was much worse. On the hardware where 2020 was OKish, 2024 was unplayable.