I added a browser type tally to the right hand column. I have very little idea why. It is another database query and update for each page load, but it doesn’t have significant impact on the performance. I’m still loading 280 front pages/second which is 5 times my available bandwidth. No worries yet.
I’m measuring my page load capacity with “openload”. There is a debian package and it is trivial to use. I like that in a tool. They can be found over at sourceforge, http://openwebload.sourceforge.net/