I've been doing some performance tests with loadimpact, and there seems to be something weird going on.
If you take a look at the results above (you have to focus it with the graph's bottom slider), there are performance spikes at the begining and the end of the test, ending with a huge spike from 485ms to 1.22s
What is causing these spikes?
I am just using a simple setup.
php5-fpm -> nginx -> varnish -> (images/css/js/.etc) to cdn77 -> User