What is meant by a "fast" pre amp

I have heard a pre amp described as "fast", what does that description mean?

brf02-22-2010 12:34am

brf OP Details Discussions Posts This discussion Message User 1,715 posts 02-22-2010 at 01:24am Copy Comment URL Report Comment Edit Delete I have "heard" should read I have "read" a pre amp as described as fast, what does fast mean?