@pixeljetstream @GDCPresoReviews slightly more expensive interp (mul-mad-mad instead of mad-mad, essentially) and the pixel shader had to gather the tri attrs instead of a dedicated setup stage doing it, but a PS was in a better position to hide the gather latency than the dedicated setup did, because it had some reasonable other work to interleave it with.

Dedicated setup was basically all gathers and then just a sub or two, then back to gathers, so constantly waiting on gathers.