On Ultra RTX preset, I'm getting lower than expected fps. I have an RTX 3080 and an Ryzen 5 3600X. Others are getting 70fps average while I get 40-50fps and low GPU usage, you can see it's 63% in the image.
DLSS does next to nothing for me as well, boosts fps from 47fps to 50fps with RTX enabled. So these are the issues, I think they may be connected.
Posting this in hopes that CD Projekt Red will notice and fix this soon, many are having this issue, see here for example: https://linustechtips.com/topic/1279643-cyberpunk-horribly-low-fps-3080
Here's a video showing the weird DLSS behaviour: