I have a 15" unibody MBP, one of the revisions right before the sealed in battery revision. It's running snow leopard, recently I started having slowdown problems when opening any finder windows. Whenever I open it it takes like 10-30 seconds for the window to show up and it beachballs and crawls when I try to select a file/app to open. When I don't have a finder window open everything runs fine, any ideas what could be causing this?