I’m an AMD user, 5800x CPU and 6900 xt GPU with a reverb G2 but I think this might apply to other systems as well.
SU7 ran really smooth for me but SU8 brought back the stutters. Even after lowering my settings the stutters persisted. I always keep everything updated with latest drivers, firmware, windows updates etc especially since I have rather new hardware but several months ago I stopped updating my motherboard bios. Mainly because I had dialed in performance improvements for my CPU and didn’t want to mess with that. Well after trying many things to fix the stutters I figured the bios was my last hope. Immediately after I updated my x570 motherboard bios and all my stutters are gone now. I’ve been flying this way for 2 days now and the stutters have not returned so I’m confident this was my fix. I’m back to SU7 smooth stutter-free flying.
So if you’re experiencing stutters and can’t find a solution, I suggest you check if there’s a bios update and give that a try. Hopefully it helps you like it helped me.