http://kly.no/posts/2009_12_08__Varnishstat_for_dummies__.html
Great little article on how to make sense of the varnishstat output.
http://www.phpied.com/non-onload-blocking-async-js/
Strategy to load javascript asynchronously without blocking page load. Involves creating an iframe, loading the script in the iframe, then setting the iframe's dom to the parent's dom to allow the script to work normally. Tricky.
http://www.stevesouders.com/blog/2012/02/10/the-performance-golden-rule/
90% of time is in the front end. Top 10 sites = 74%, top 10k = 92%, top 50k = 87%.