Mark Zeman Lightning Demo Keynote - Velocity Santa Clara 2014
summary
SpeedCurve runs WebPageTest on 250 sites across 17 viewports to measure responsive asset changes and finds worrying specifics: the 320px viewport is only 18% smaller in bytes than 1920px on average, 38% of sites “flatline” with no optimization, 55% partially optimize, removing flatliners yields a 43% image-size gap, Newzealand.com generates 22 image variants and serves WebP, only 5% conditionally load CSS (Obama cuts CSS 88%), 11% conditionally load JS, and many sites actually increase mobile image payloads.
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