Why more than 500ms time difference between DOM Content Loaded and Onload

[GreenGecko]

A test from close to the server ( which lowers latency all round )... http://www.webpagetest.org/result/151015_T8_3TW/

This shows an increase in CPU, so it must be processing embedded javascript. As there is almost none on the page, the I expect it's the init () function that's slowing everything down.

Either that, or a reorganisation of css / js from the body into the header and fixing the worst of the html errors may give the browser an easier time in parsing it.