(01-02-2013, 03:58 PM)Streeter Wrote: DX9 is the fastest, yet least accurate/stable, while OpenGL is the opposite (and DX11 being somewhere in between).
More accurately put, DX9 is generally faster than OpenGL or DX11. Whichever one runs faster for you depends on which games you're playing, your hardware, and the drivers you're using. Sometimes DX11 actually runs faster for some people. I've also seen a handful of games other users play where DX11 performance tanks while OpenGL stays in the middle. Other times OpenGL performance delivers more FPS in certain games over the either DX9 or DX11. In short, it depends; generally, your statement holds true, though not in every case.
(01-02-2013, 03:58 PM)Streeter Wrote: So, does this still hold true with the 3.5 release? How much has changed in terms of performance/accuracy/stability since?
Probably, not much has changed. Accuracy has gone up since 3.0; DX9 is still the least accurate, being behind DX11 and OpenGL. Their overall performances should be relatively the similar, though I remember a few commits that reasonably sped up the DX9 and DX11 backends a few months ago (can't find it atm).