Not all disciplines. As long as the bullets completely passes through the cardboard backer, it's fast enough. Bullseye and PPC come to mind.
way offtopic but
good to know, I want to try some Bullseye pistol this year, I used to be a fair pistol shot but fell out of practice after a broken ankle and now I really suck. No more IDPA or USPCA but I always wanted to try Bullseye