Aerotwist - The Anatomy of a Frame →

a little reference for what's involved in shipping pixels to screen

Paul Lewis is going deep into the rendering pipeline - again. Caveat: his is a Blink / Chrome view of the world; most of the main thread tasks are 'shared' in some form by all vendors, like layout or style calcs, but the overall architecture he describes may vary for Gecko / Firefox and Internet Explorer / EdgeHTML.