What I'm trying to say is: It is very hard to know what comes from what.
I believe the connection between judder (from tracking) and fps are only connected in the way that a system (CPU & GPU) that doesn't rech high framerates is very likely to have tracking problems too and vice versa. If you restrict elite to one core you will see a massive performance drop in framerate and tracking which is I guess because elite also doesn't run solely on the GPU. Most quality setting however are render related which almost completely is done on the GPU.
There is also a problems with the terms stutter, judder, microjudder, dropouts and so on.
For example: I can have a very constant low framerate which of course will result in the visibility of single frames when I move my head fast, but without tracking dropouts which usually are not regular or happen just every 3rd frame or so (just an example) the whole experience can feel much smoother to some than high framerates with constant tracking stutter (meaning the camera rotation is not updated fast enough).
It all depends on individual perception or to put it like this: what's bugging you most.
I am of course no expert. I'm just trying to say at this moment where the "flaws" come from and what you can do about it. Still collecting as much info as possible is a good idea allthough it may be outdated very soon
My advice to anyone with Judder
Check your FPS, if it's less than 75 then that is the cause of judder and you should work to fix that first and foremost.
If it's stuck at 60fps and never goes any higher then you have the Vsync issue, turn Vsync off or unplug your 60hz monitor or lower the monitor's resolution till you can set the refresh rate to 75hz (e.g. I run my 1440p 60hz monitor at 1280x1024 which allows me to run it at 75hz rather than 60hz).
If the FPS goes above 75hz (or is capped at 75hz by vsync) but goes under 75fps a fair bit then the issue is performance related. You can lower your settings or monitor your GPU and CPU, work out which is the bottleneck and either overclock or upgrade.
Core parking can come into play here, turn off core parking to be sure. If you're on Win 7 then make sure you disable Aero.
If it's stuck at 37.5hz/fps then the issue is that you are running in direct mode. Change to Extended.
If the FPS is always north of 75fps and you still get judder then it could be camera related. if you block the camera does it work better? If so trying plugging the camera into a USB 2.0 (black) socket rather than 3.0 (Blue). Plug the power cable into the camera. Sit further back/closer to the camera and see if that fixes the issue. Try the desk demo, does that work AOK? if so go back and monitor your FPS, it's probably that but you didn't check it well enough.
If all else fails it's probably some kind of software issue and they've hard to debug, I'd recommend a backup and format/reinstall windows (harsh but the only way to be sure).
You want 75fps in games in VR, anything else is subpar to 75fps. You might be used to less than 75fps and have come to terms with it but it's still subpar compared to 75fps. If you are getting 72fps then it's not too bad, you still get low persistence. Anything south of 72fps is subpar, it causes judder, you get smearing if low persistence is turned off. Anyone that's interested in VR should be attempting to hit 75fps in their VR games. This is heavily documented.
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