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Critical CSS? Not So Fast!

CSS Wizardry

Let’s look at the performance implications of getting Critical CSS right. We actually have a synchronous JS file that takes longer than the CSS does 4 : performance. performance. By switching from an asynchronous media type (i.e. media=print ) to a synchronous media type (e.g. mark ( ' head finished ' ).

Media 351
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Fostering a Web Performance Culture

Jos

Web Performance is not only about understanding what makes a site fast. Performance is a feature and needs to be prioritized as such. Performance is a topic that has interested me for a long time. Moving over to web, the performance problems are different. This is not a post explaining why web performance is important.

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Bringing AV1 Streaming to Netflix Members’ TVs

The Netflix TechBlog

by Liwei Guo , Ashwin Kumar Gopi Valliammal , Raymond Tam , Chris Pham , Agata Opalach , Weibo Ni AV1 is the first high-efficiency video codec format with a royalty-free license from Alliance of Open Media (AOMedia), made possible by wide-ranging industry commitment of expertise and resources.

Media 246
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How to prevent hidden images from loading on responsive designs

MachMetrics

Responsive design is an absolute necessity in today’s web. Unfortunately, many themes and frameworks achieve responsive design by using hidden images on mobile devices or tablets. Plus, you’ll see a nice improvement in your mobile page speed scores ! Using <picture> with srcset.

Design 57
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Links on Performance V

CSS - Tricks

Does shadow DOM improve style performance? HTML-first, JavaScript last: the secret to web speed! Getting Your head Straight: A New CSS Performance Diagnostics Snippet — We covered Harry’s super clever snippet a while back, but Vitaly had beaten us to it and it’s worth re-sharing because it’s awfully cool.

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Web Performance Bookshelf

Rigor

Reading time 1 min Why share the library of the web performance books while there’s a substantial collection of fantastic websites and articles on the net? High Performance Browser Networking. This book is about performance problems and the various technologies created to fight them. High Performance Websites.

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Fostering a Web Performance Culture

Jos

Web Performance is not only about understanding what makes a site fast. Performance is a feature and needs to be prioritized as such. Performance is a topic that has interested me for a long time. Moving over to web, the performance problems are different. These days we have more and better tools to audit our performance.