It was pointed out a couple of days ago that we might be somewhat over-doing it with the amount of comments in our code, especially in our CSS files. I didn't realise just how much until I ran a little test using our new-fangled dynamic CSS thingy; comments make up around 16Kb in the 65Kb of css sent down for the homepage alone.
For a broadband user, that's a whole... one-third of a second to download. Ahh well, at least we're heading in the right direction ;o)
One thing that really bugged me about the way this site runs is that, whenever you use the "back" button in your browser, the page re-loads. This isn't a standard thing - if you go to, say BBC.co.uk and click a link at the bottom of the homepage, then use the back button to go back to the homepage, you'll still be at the bottom of the page and you won't have to wait for it to reload. On UPSU.net, every time you visit a page it re-loads; this is great for making sure you see the latest version of a page, e.g.