Perian used to be me first download on every Mac, but 10.7 does not let me hide the file preview (top right) in column view anymore. If I scroll through a list

Perian used to be me first download on every Mac, but 10.7 does not let me hide the file preview (top right) in column view anymore. If I scroll through a list of video files and hit something complicated (like MKV) the Finder just hangs. Has this bothered anyone else? Or is detail view more common in the wild? I love the VLC redesign though, and it arrived just in time, so I'm happy.