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Progressive jpegs: a new best practice

Progressive jpegs: a new best practice | Lectures web | Scoop.it

Bandwidth-wise, images are hogs. They are the largest average web site payload (62%), and they are most often the content bottleneck. When images arrive, they come tripping onto the page, pushing other elements around and triggering a clumsy repaint. They come “chop chop chop chop chop down” or you get nothing until suddenly “boom!” out of nowhere there it is. We all know what I’m talking about when I say “chop chop down” and “boom” and it makes us a little bit sick, because we sense how much time we’ve lost of our precious, short lives, waiting for pictures to download.

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DOM, HTML5, & CSS3 Performance

In this 30min video I cover:

Reflows, what they are and how to avoid them
Hardware accelerated CSS, how to trigger it
Letting the browser optimize animation for you with requestAnimationFrame
Web Workers
Benchmarking
Build scripts
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