When I click on a large audio or video file in a Finder window my mac hangs for ages spinning a colourful wheel and then it eventually displays the file's preview as requested. This is in column mode. This takes so long I could have forgotten what I was doing. Up to a minute and thirty nine seconds or so. Does anybody know why and if I can stop it? I know that turning the preview off (clicking the tiny arrow top left of column) will stop it but it's not the best answer. I use this mode often to quickly check through files and some of these are huge video files (4gb). It didn't used to do this in the previous operating system at all. And not having a simple control panel along the bottom for video/audio files is wrong as well. This new click the spacebar is great but if the control panel was there too we'd have the choice of which to use, for quickly scrubbing through film and the like without having to press the space bar. I'm on a mac pro with 8 cores and system 10.5.2 which I thoroughly love, it's just these little things that used to make it perfect.