͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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In some ways, the way we monitor and present web performance monitoring data is flawed. When constantly looking at medians, averages and percentiles, our analysis can easily obscure subpar experiences.
We become accustomed to a certain range of poor user experiences even when they’re visible. They become acceptable—a necessary cost. Finding which audiences have poor user experience can also feel too hard to investigate. Still, we shouldn’t give up.
**There’s no good web performance if everyone doesn’t experience it.**
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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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### [A Unified Theory of Web Performance](https://calendar.perfplanet.com/2021/a-unified-theory-of-web-performance/)
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[Alex Russell](https://twitter.com/slightlylate)
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There are probably as many definitions of what web performance is and should do as many people you ask. Hear one of the most insightful performance experts explain their page speed north star.
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### [Using Diagnostic Metrics](https://calendar.perfplanet.com/2021/using-diagnostic-metrics/)
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[Annie Sullivan](https://twitter.com/anniesullie)
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How to choose from dozens of web performance metrics, and how do they help diagnose UX problems? Follow this strategy to help narrow down problematic areas in your sites and apps.
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# Case Studies
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### [Improving Core Web Vitals, A Smashing Magazine Case Study](https://www.smashingmagazine.com/2021/12/core-web-vitals-case-study-smashing-magazine/)
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[Barry Pollard](https://twitter.com/tunetheweb)
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Investing in web performance isn’t new for Smashing Magazine, but they still faced long-standing issues despite all the efforts. See how they overcame them and what they learnt during their journey.
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# Tools
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### [SQIP: a pluggable image converter with vector support](https://github.com/axe312ger/sqip)
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[Benedikt Rötsch](https://twitter.com/axe312ger)
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SQIP generates SVG-based previews of images. Use them as a lazy-loading image preview, a video thumbnail or an artistic element for your projects!
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### [Fuite: a CLI tool for finding memory leaks in web apps](https://github.com/nolanlawson/fuite)
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[Nolan Lawson](https://github.com/nolanlawson)
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Testing memory leaks in JavaScript isn’t easy or widespread. With Fuite, you can test for memory leaks straight from your command line. Give it a go!
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# Talks & Podcasts
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### [Why we need to talk about audits](https://www.youtube.com/watch?v=mMIKtfVD21g)
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[Martin Splitt](https://twitter.com/g33konaut) & Bartosz Goralewicz
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Learn how to streamline the collaboration between SEOs and developers. Find out what SEOs recommend and how the focus on search engine optimisation impacts performance.
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