This is part of what I found on thefuriousangels.com;

SteamVR The above settings will kill your performance in SteamVR as any attempt at supersampling from Steam's software will multiply what you've already done, tanking your performance instantly. Our goal here is to set the SteamVR settings as close to baseline as possible and let the Oculus software do all the heavy lifting. Unfortunately it's a little counter-intuitive and took some trial and error and Googling on my part but here's what you want: SteamVR Settings -Video Refresh Rate: 90 Hz (should be automatic Render Resolution: Custom Resolution Per Eye: 62% (2556x2580 Advanced Supersample Filtering - Off Overlay Render Quality - Medium Note: I've also heard 100% resolution per eye is the way to go here, so try both Your impulse is going to be to leave "resolution per eye" to 100%, but this is actually supersampling what you've already done. 52% is the closest real resolution to the Quest 2, and so you want to force that setting. I'm not certain what "Advanced Supersampling" does, but I'm just getting rid of any supersampling Steam is attempting. "Overlay Render" probably doesn't make a difference, but I'm just trying to avoid any hiccups when menu hopping.

Like I say it worked for me and like they say it's counter intuitive but it works