Is it just me or is Safari (now version 1.1.1) no longer multi-threaded, at least with regards to the graphics engine?
To see what I mean, go to an intense webpage of your choice or start a large download, and then select a menu item. The page and the download continue to download, but neither does the page completely load nor the download progress bar update until the menu item is released. I have a suspicion that previous versions of Safari were multi-threaded graphically, too.