Part of my job at HubSpot is to meet and welcome new potential HubSpot engineering hires. One of the most surprising things I get to tell them is that we deploy 200-300 times a day.
Studies at Google and Amazon have shown that even 100ms of extra load time can have a dramatic effect on your conversion rate. So how fast is your site?
There is a little known portion of the HTML5 performance API which has made it into Chrome: