Automated performance tracking

[adehnert]

We've seen some speed issues (eg, ASA-#112) with the DB. It would be awesome if the DB automatically tracked how long page loads were taking (and ideally how DB access, computation, and rendering compare) and stored that for later analysis.

Some possibly-useful tools include ​https://github.com/disqus/django-perftools, ​http://chris.improbable.org/2010/08/30/django-performance-monitoring-using-speedtracer/, and ​http://code.google.com/p/django-performance/. (In descending order of how promising they look after a couple minutes of looking at their websites...)