AMP - Google Searchservices.google.com/fh/files/misc/ne_speed_race_webinar_amp.pdf · AMP Accelerated Mobile Pages. PIC AMP ? What AMP JS does for you Smart Content Prioritization
What AMP JS does for youSmart Content Prioritization Elements are prefetched when appropriate, layout is only performed once, loading is asynchronous.
Efficient Layout and RenderingOne network request to layout the entire document, style recalculations are minimized, and only GPU-accelerated animations are allowed.
Limited by DesignThere is no 3rd-party JavaScript outside of iframes, no scrolling elements, and CSS is limited to 50kB in the document head.