I’d noticed that Google Chrome (on my Mac, at least) was taking longer and longer to get started, and then I’d still have to wait for several minutes for any of my autocomplete history or favicons on the bookmarks bar to show up. As it turned out, I’d never cleared my history before, and that was really killing startup performance on what is otherwise a very, very fast browser. Of course, after clearing my history, all the URL auto-complete history I’d built up over months of use has to be restored, and that is mildly frustrating — but not necessarily as frustrating as waiting for the browser to get started.