Every time I launch either iTerm or Terminal after not using it for a few hours, it takes anywhere from 10-20 seconds to return a prompt. The screen is blank, and although I can type I can't actually run any commands.

If I quit either application, subsequent launches (if done relatively soon thereafter) are quite fast. The slowness only seems to occur if the app wasn't running for a few hours.

I'm running OSX 10.5.7 on a MacBookPro. I have the exact same setup on another computer, with no slow downs.

Any ideas how to speed things up again?