Where I'm experiencing the most noticeable regression is in Shadertoy, https://www.shadertoy.com/new should run at 60fps on any modern hardware with WebGL enabled yet I'm getting at most 20fps (and higher CPU usage than usual).

On my system R seams to work correctly.

Could the problem be related to this? https://bugzilla.kernel.org/show_bug.cgi?id=205663

@adurante Yes, my R install is very clean.

On my system all tests pass.

@adurante, here you have the full output

I am getting the correct value.

I did file the same issue here.

I'm referring to the Plata-Lumine theme with "Dark theme" switch disabled.