I would guesstimate low single digit microseconds (and guesstimating latency is pretty much my job).

Typical USB poll rates are 10-100 milliseconds. AMD made a perfectly sensible choice.

Wat. All but the cheapest crappiest mice have been using 1ms polling for the last decade. IIRC USB 3.0 is effectively 8kHz and doesn’t use polling which does make a difference for real-time video (webcam and capture card) latency and lip syncing.

But nobody cares about USB. A lot of applications do 10000 reads from your SSD in series (qd1) and that’s where latency matters. I agree that it should be on the order of 1us. And since most people only have one SSD, chipset latency is not that important.