͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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Confirmation bias is a tendency to search, interpret and favour information that confirms our existing beliefs. Confirmation bias is one reason why websites and apps are still not as fast and accessible as they should be.
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We assume we live in a modern-day age, where fast networks and good devices would be evenly distributed—nothing further from the truth. Some gaps become smaller, but a vast majority of the population isn’t benefitting from those fast networks and devices we were expecting.
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The web is open. The web is for all. We won’t fulfil that mission if we ignore the realities of access and inequality. We won’t break down barriers if we don’t confront our biases.
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Karolina
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#### What’s Performance newsletter?
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Performance Newsletter is a fortnightly mailing by [Calibre](https://calibreapp.com), featuring web performance tools, talks and resources.
Don’t worry—we don’t spam. If you’d like to leave, [unsubscribe]() at any time. Suggest content [here](mailto:[email protected]).
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# Articles
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### [How to Improve CSS Performance](https://calibreapp.com/blog/css-performance)
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[Milica Mihajlija](https://twitter.com/bibydigital)
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JavaScript might be the primary, but it isn’t the only source of speed headaches. CSS can cause significant performance issues too. Do you know how to prevent them from happening?
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### [The Mobile Performance Inequality Gap, 2021](https://infrequently.org/2021/03/the-performance-inequality-gap/)
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[Alex Russell](https://twitter.com/slightlylate)
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It’s easy to assume that modern devices and network are fast—after all, technology has been progressing at warp speed. Is that a fair assumption based on data? Who are we excluding when not prioritising performance and relying on biased theories?
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### [Making the slowest "fast" page](https://www.tunetheweb.com/blog/making-the-slowest-fast-page/)
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[Barry Pollard](https://twitter.com/tunetheweb)
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Is it possible to trick Lighthouse that a slow website is fast? Everything can be gamed (to some degree), so entertain this theoretical exercise.
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# Case Studies
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### [Measuring Frontend Latency: Our Strategy to Simplify the Complex](https://medium.com/glossier/measuring-frontend-latency-our-strategy-to-simplify-the-complex-7e0ae0fe3c6e)
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[Aaron Suggs](https://twitter.com/ktheory)
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With dozens of speed metrics available, how do you choose the ones to focus on? And more importantly, how do you measure them? Learn about Glossier’s approach.
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### [How CLS optimizations increased Yahoo! JAPAN News’s page views per session by 15%](https://web.dev/yahoo-japan-news/)
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[Shunya Shishido](https://twitter.com/sisidovski), [Tomoki Kiraku](https://twitter.com/gladenjoy) & [Milica Mihajlija](https://twitter.com/bibydigital)
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Unexpected layout shifts are frustrating and often confuse people browsing your sites. See how Yahoo! JAPAN uncovered and addressed Cumulative Layout Shift issues.
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# New in Calibre
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### [Release Notes: February](https://calibreapp.com/blog/release-notes-feb-2021)
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Here’s our monthly roundup of what was released in February: more options when testing protected Sites, updated Test Agent with Chrome 89 and more.
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