So I recently switched my work laptop over to Linux, because Windows XP was running incredibly slowly. Now I know that the usual cause of "Windows XP is running incredibly slowly" is simply "spyware" but in this case, it's "corporate required spyware" (Norton Antivirus, asset tracking software, etc.). It's slowing the thing to a freaking crawl.
It turns out that there's an official way you can get out of having to run the asset software and all that other corporate software: run Linux. (This also gets you out of having a supported PC, but I can cope.)
So I installed Debian Testing on it. And the laptop boots much, much faster now. (We're talking a good two minutes to load everything versus something like 20 minutes under Windows. Not kidding.) It runs faster. About the only thing slower is that, for some reason, GNOME feels slower than Windows. (KDE too, but Debian defaulted to GNOME, and I haven't decided to change it yet. Eclipse and Firefox both use GTK+, so, I'm basically just using GNOME software anyway.) But it's really not that big a deal, because minor things like compiling and running the software are faster.