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Unfortunately I'm unable to use the latest drivers with the faceshift software I need - what with the whole Apply buyout thing. Stuck using a 2014 iteration I believe.
In any case - I've done the experiment to prove that its most likely a light problem by leaving the camera on all day and watching its fps drop as the sun drops down - opening up the rooms curtains actually increased the fps in this test so I assume from the evidence that its a lighting issue not a driver issue. Unless of course the newer drivers need less light?