I thought I detected quite a bit of shader stutter when it first started but it seemed to clear up reasonably quickly. Likely because the environment is very samey across the demo area.
I wouldn't say it runs good on PC. The streams I've seen show a lot of stutter during the beginning two hours (, the initial new york city and the first part of the fantasy world) and it is not related to the streaming from Twitch/YouTube.
I think if you limit performance sensibly it can be a pretty smooth experience once the shader stutter has been resolved which seemed to be within a couple of minutes of starting for me, save the very occasional stutter further in.
The games seems to be quite CPU limited at max settings (including RT) on my 3700x. Using RTSS I can get a flat line save some very minor fluctuations in the most intense moments at a locked 40fps. That's at a resolution of 3840x1600 with DLSSQ engaged. I can see the GPU is quite comfortable at those settings, rarely going into the 80% range, but the CPU is regularly straying into the mid 80's or possibly above on some cores. At native res the bottleneck shifts heavily back on the GPU though on a 4070Ti. I haven't checked specifically but that might be a VRAM limitation as it seems to be using around 9.7GB with DLSSQ.
Note all of this is without yet installing the game ready drivers so I may give that a try tomorrow and also to re-validate my understanding around shader stutter now that I have identified settings that provide otherwise smooth gameplay.
Watch and share Loads GIFs on Gfycat
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It's basically instant. source is an era user in the performance thread. Starting loading time, on an NVMe. https://gfycat.com/anyabsoluteicterinewarbler
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Impressive loading skipping the logo on a PCIE 4 NVME SSD. Loading time are part of the past.
EDIT: It is loading in 0.2 s
Yes even with my "paltry" 16GB RAM I'm getting ~1s load times or less from the main menu on a 3.5GB/s NVMe. DirectStorage FTW!