[anvic]

For most of us driver memory bugs are extremely rare and therefore a 2-14% performance drop is bonkers.

[mrguyorama]

My AMD GPU driver bugs out pretty regularly. Hardware companies are not known for their bulletproof driver code.

[astrange]

Anything you're not testing regresses, and any driver you let out of jail is going to regress too.

Properly engineered security fixes don't cause performance regressions, either because you find improvements to pay for them, or you get the hardware updated to make them cheaper. (That'd be PCID in this case.)

[saagarjha]

Both of these cost money.