Same issue, also went to BPM's settings->display->Advanced, Disable GPU Blocklist, restarted Steam, no performance gain whatsoever.
RTX 3080 - 525.85.05 drivers on Pop OS, also tested same driver version on Gentoo with ~amd64, also tested Manjaro, Nobara, issue present across all distros.
Hardware acceleration on nVidia is not working.
Nothing extracted yet.
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Describe what you expected should happen and what did happen. Please link any large code pastes as a Github Gist
It runs at maybe 2 fps. Games work, of course, so it's not some driver issue.
Steps for reproducing this issue: