So since the post I've done a lot of testing, I wasn't sure what you meant by steam performance graph unless you meant the frame timings but regardless I just did my own form; basically I found that VR High was flawless, Ultra caused some dips but both were actually quite lowballing on the settings; aka a bunch of things are set to Low / Medium : specifically I found MY most comfortable option being using the profiler to set everything from Texture to Jet Cones to "High" with Supersampling and HMD Image Quality to 1.00 with some small exceptions; Blur Off, DOF Off, Anti Aliasing None (honestly, didn't mess with these because I just don't care that much about them, they could probably all be on if I was concerned with it. I might up AA eventually.)
With this setup, I run buttery smooth - I mean BUTTERY SMOOTH in stations, zipping around stations, flying high on planets, low on planets, no matter WHAT is going on, this is seriously to me, the flawless setting for my setup.
However...with that said I tried to run Low VR with Supersampling 1.5 - Double-vision delay in stations. Tried 1.5 HMD quality in station again, on Low VR ; still the same problem. My conclusion simply being the SS and HMD Quality settings are indeed horrible in ED, but neh. Hardly a problem to me, given that I can set everything to High - maybe Ultra - set the HMD quality to 1.0 and the SS to either 0.65 or 1.0 and use a tool to tweak your HMD of choice and avoid the ingame settings in that regard. But.. frankly, I personally don't need to go further.
My buttery smooth setting is just that, buttery smooth, perfect, crystal clear to read everything and at most I might apply AA to get rid of minor jagged lines, but regardless altering the Vive's quality itself instead of using ED's settings would probably yield better results than having either of those ingame options above 1.0 short of running a SLI'd Titan X's or something :3 May be exaggerating a bit, and it varies depending on how picky you want to be about the dips when your talking about 1.25 settings and such, as mostly I found them entirely playable, minor, and not there the majority of the time but some are vastly more sensitive about frame-dips in VR than I am.
Also fairly important to bear in mind I do NOT enable reprojection or a-sync at all as to notice any dips at all below 90 that are legitimately noticeable so with these settings turned -on- raising SS or HMD Quality might have been possible and entirely smooth.