I experienced improvements in the speed of the Finder after doing an Archive and Install on my new Mac Mini 2 Ghz. (i had previously done an upgrade installation) Moving files used to take seconds. Even after installation, it still took a while, i had to do this action several times before the machine actually seemed to learn this process and it is now instant. Opening folders is now instant. I still believe that Tiger was somewhat faster. As far as the choppy animations, Expose seems fine, the widgets open slow or faster depending on how many applications are running at the same time. The dock seems fine, but the grid opening of applications in the dock remains jerky. I see this seems to be a problem on faster machines as well.