͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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We made it—the year is nearly over. Without the usual preface, I’d like to thank you for being here: reading and sharing the Performance Newsletter.
It means a lot to us to have so many of you engaged in making the web faster and more accessible. We look forward to sharing even more new and insightful resources. For now, have a peaceful transition into 2022!
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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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### [Why Lighthouse Performance Score Doesn’t Work](https://calibreapp.com/blog/downsides-of-performance-score)
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[Karolina Szczur](https://twitter.com/fox)
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Page speed metrics aren’t without flaws. What happens if one of the most popularised web performance signals comes with many caveats? It’s time to reassess the Performance Score.
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### [Performance Implications of JavaScript Errors](https://calendar.perfplanet.com/2021/performance-implications-of-javascript-errors/)
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[Amit Singh](https://twitter.com/sans_colon)
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How do we measure the impact of JavaScript errors on speed? Do more prevalent errors always degrade performance? Read on to find out.
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### [HTTP compression](https://calendar.perfplanet.com/2021/http-compression/)
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[Leon Brocard](https://twitter.com/orangeacme)
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Compression is a core feature of HTTP that improves transfer speed, cache bandwidth utilization and cache utilization. Learn about its past, present and the future.
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# Case Studies
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### [How QuintoAndar increased conversion rates and pages per session by improving page performance](https://web.dev/quintoandar/)
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[Daniela Sayuri Yassuda](https://github.com/danielasy)
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Learn how a Brazilian proptech company refactored their app to deliver significant improvements to Core Web Vitals. In consequence, QuintoAndar’s saw an 87% increase in pages per session!
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### [Measuring Web Performance at Airbnb](https://medium.com/airbnb-engineering/measuring-web-performance-at-airbnb-122da8d3ea3f)
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[Joshua Nelson](https://twitter.com/nelsonjoshpaul)
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Find out what web performance metrics are most important for AirBnB and why they opt to design their own measurements, including a Page Performance Score.
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# New in Calibre
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### [A Year in Features: What We Released in 2021](https://calibreapp.com/blog/release-notes-2021-summary)
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Here’s our yearly summary of new features, improvements and free page speed tools we’ve built in 2021. Read on for a sneak peek of what’s coming next year!
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