Change refresh rate in Textmate?

A long time ago, I changed a setting that would make holding down CMD-Z (undo) and CMD-X (redo) a whole lot faster. I believe it was the refresh rate or something and I don’t believe it was an actual setting in Textmate, but perhaps through Terminal.

I recently reformatted my MacPro and really miss it because when I have a TON of undos to do, it takes a lot longer to go back (say 80 or so undos).

Does anyone have any idea what I’m referring to? I’d really like to change the setting again to help speed things up.