I’m in Arch and I generally struggle to get video acceleration in a browser with an Nvidia GPU.
I’m sitting with SW acceleration in the browser today because some update broke it. I have had it working in the past but I’ve had like 2-3 updates in the past 2 years break it.
And for what it’s worth there was a really bad tearing bug because of the argument over implicit and explicit synchronization that neither side wanted to fix. I think it’s since been addressed but that was only like in the past 6 months or something. So it’s definitely not been “years” since it’s been working seamlessly. Things break at a greater rate than X because X basically is frozen and isn’t getting updates.
With Arch, you have to read up ahead of time before updating software because it's a rolling release.
I remember one breaking change when I was switching from the previous Nvidia drivers to the new 'open' ones, but some breakge was expected with that change.
So it might make sense to avoid Wayland in that case.
Make sure you have switched over instead of using the old proprietary one.