I noticed the same thing on my Intel 2020 MBP. Safari keeps freezing up at the very start, and all applications has a lag with the keyboard/input. Kind of like something is holding back the OS.
It's annoying because when I ran the betas, it was silky smooth, especially during the first several betas. This is a fresh new install, too. I suspect the new autocorrect might have something to do with it.