[Bigwill]

I picked up swing speed by going to a heavier stiffer shaft. It allowed me to swing at my normal speed because my brain new i wasn't going to over power it.

Prior to this i had a lighter/weaker shaft that i could overpower and balloon. Thus i swung slower because if i turned it up the ball wouldn't go anywhere.

I've experienced the same thing. I've broken quite a few shafts, so if have one that is too light or flexible, I have a hard time making a good swing at it; I usually end up quitting on the shot.