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Your Hero Images Need You! Save the Day with HT...

Your Hero Images Need You! Save the Day with HTTP2 Image Loading

Images form 64% of all website data & have a high correlation to page load time. Optimizing image delivery through compression alone is a daunting task. Using HTTP2's superpowers, we can optimize images to ship faster, increasing the perceived performance and initiating users' emotional responses to visuals earlier. HTTP2-powered image delivery leads to lower bounce rates and higher conversions.

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This version of my talk was given at beyondtellerrand conference in Düsseldorf, Germany on Tuesday, 20160510.

Tobias Baldauf

May 10, 2016
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  1. Default Scan Levels Thanks to Frédéric Kayser for creating 'jsk':

    http://encode.ru/threads/1800-JSK-JPEG-Scan-Killer-progressive-JPEG-explained-in-slowmo 41 / 89
  2. John Melor (Google, SPDY, 2012): @15%: initial visuals @35%: good

    visuals thanks to John Melor for this fantastic research and thanks to Yoav Weiss & Andy Davies for publishing it in their slide decks! See https://yoavweiss.github.io/respimg-blinkon-presentation/#/71/2 53 / 89
  3. Site A displays 7.4x faster than Site B more info

    at https://sites.google.com/a/webpagetest.org/docs/using-webpagetest/metrics/speed-index 61 / 89
  4. And Reduce Speed Index by 57% (6% via JPEG Scan

    Layer Optimization alone) 88 / 89