Depends what gun its going on.
If its a low preassure gun, doesnt really matter as long as the recharge rate of the valve is good, otherwise your velocity will drop of when you fire fast.
If its an RT mag or similar, the higher input preasure requires an ADJ system so you can tune the trigger response so as you do or dont get bounce.
EG: My RT can do about 15 BPS with about 650 psi going into it, not bouncing just me firing it. If I wack it up too 8-900 psi it will do about 24 BPS but that will be some bounce involved as well!
Gaz