Tap 2-3-4, Tap 2-3-4, Tap 2-3-4, Tap 2-3-4, Tap...
or maybe something in the middle? Does it seem to make a difference to you? Or do you just tap more or less rapidly depending on the intensity of the situation? Should we all be buying stock in replacement space bars?
I find the best way to use the space-bar is to mash it with my face.
Joking aside, i use auto-fire with change cancels...just ****es me off when i forget to hit the space-bar to fire after switching to quick, realizing i am engaging and closing on a target and not firing at them. Of course, it does help when i get scrambled and switch to a teammate to heal them, that i do not shoot them and actually do heal.