PageLoadStats is a tool I wrote to grab performance and stats about web pages and chart the data in a simple and useful way. It also has the ability to send alerts when the page load times moving average gets past a configurable alert level. It’s written in Python using Django.
If you have any interest in digging into the source code, grabbing a copy for ideas, or to start a new project, have at it! I’m open to any input, as well. pageloadstats in use pageloadstats in github