You were right —
four times faster. I have downloaded the nightly and am now getting 40-60 fps on 4K content with my 16" MacBook Pro with M1 Pro. Remarkable. Mac Studio with M3 Ultra
really is going to be scary fast.
Tomorrow I guess I'll test on my Mac Studio with M2 Max purchased in June.
Thanks!
UPDATE: As expected, M2 Max gets 50-70 fps on the same 4K content — ~15% faster, which is no small thing. That militates in favor of M3 Max roaring along around 90 fps, and M3 Ultra being truly terrifying.