It's official: according to Google Webmaster Tools, this site is now “faster than 84% of sites”:
Can you tell when I made the switch from using Drupal to Django? ;)
Here's my Pingdom graph for the same period:
Pingdom also show the same marked improvement around the end of August.
Hopefully there'll be another improvement to report on soon - I upgraded Django to v1.3 a couple of days ago (absolutely painless) and finally got around to setting up memcached today (a little more painful due to a bug in the pylibmc library that causes mod_wsgi to hang). Time will tell how the caching affects things, but in the meantime, here's a “live” report from Pingdom for the last month: