Are you using a Meta Quest headset? I discovered the best performance with my MQ3 was via airlink and then launching ED direct from that instead of SteamVR (or Steam link). You can also tweak some stuff in the Oculus Diagnostic Tool to increase encoding which I think means it reduces the fresnel effect with the pancake lenses. I also used an ED profiler thing which changes the colour scheme which helps greatly with readability of text.
Yeah 3. I can't remember what I tried wireless but it just was terrible so I put up with a cable for now until I can be bothered to try it again without, plus it has the added bonus of keeping itself charged I guess whilst I plug it in.
I don't know what the Fresno effect is but I've tweaked most of the settings to go as high as they can, like 750 encode rate etc.