I use a lot of .jpg and .tif files. In Windows Explorer on XP Professional, it takes a long time for the files to be listed. The icon beside the file name (in details mode) changes from a generic file icon to the Photoshop icon (that's the link I've chosen) one file at a time, and while this is happening, my CPU usage is at 100%. I've used TweakUI to speed up the menus, as suggested on this site, and that helped. Does anyone have any other suggestions?