I did some playtesting with this last night on my 4930K rig for about an hour or so. I was able to use a W2 game save along with a completed W3 save for a newgame+ campaign. It was something I'd wanted to do since I really liked the weapons/armor I had at the end of my last playthrough. The first 10 minutes had some stutters but I think that was perhaps while it was compiling whatever and after that, it did get better.
As this is now my 2nd DLSS 3 game that has prevented MSI AB from working I believe that may have something to do with at least some of the crashing reports. I had the same thing happen with Portal if I tried to use EVGA's Precision X1 OSD so I didn't even both trying to force any kind of OSD.
That being said, I had it on RT Ultra, turned off the usual junk (blur, lens flare, etc.), and set it to V-Sync @ 60 FPS. The 4930K/3090 Ti did o.k. with this at 5120x1440. I believe it was averaging 40-60 FPS. Unfortunately, CDPR did not update the engine to recognize UW aspect ratios or give an option to manually change, so the cutscenes are still 16:9 but I plan to re-find the hex code fix for it as the ones from earlier versions are great because there is content visible in 32:9 that is not seen with 16:9.
Other than that, I do see some improvements but have only just barely gotten into it. Face textures seem the same but overall scenery such as vegetation, buildings, sky, and water, is where I noticed the most improvements. However, since I've been using Halk's mods since around 2018 a lot it still looks similar to his last overhaul but I'm happy with that since I really enjoyed it with my last play-through.