CrumblyLiquid

I don’t know about DLSS specifically as I don’t have a Nvidia GPU but AMD FSR works fine as long as you use a somewhat new version of Proton. (And FSR isn’t limited to AMD GPUs)

I’m not sure about the frequency but on Linux you sometimes get small (few megabytes) updates to the shader cache but multi-gigabyte updates are just normal Rocket League updates (or I can’t think of any other reason).

I too have Rocket League on Steam running on Linux but I haven’t noticed any frequent big updates. Not anything out of the ordinary.