͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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The truth is, we can game some speed metrics. But what might result in meeting a goal doesn’t translate to a better experience. In an ideal world, we should trust tools that claim to bring improvements. Speed gains should be genuine and demonstratable.
Sadly, [this isn’t always true](https://twitter.com/geekybiz/status/1429746730258427911). We can make an honest effort but fall for an empty promise because of marketing or lack of resources or skills to verify a claim. It’s hard!
Ultimately, while metrics are necessary, we need to remember what’s most critical is how well something works and feels.
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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 lab and field data can be different (and what to do about it)](https://web.dev/lab-and-field-data-differences/)
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[Philip Walton](https://twitter.com/philwalton)
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Lab and field speed testing are both invaluable but can yield different results. Variance then reduces trust in monitoring. Learn why those two settings differ.
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### [HTTP/3: Performance Improvements (Part 2)](https://www.smashingmagazine.com/2021/08/http3-performance-improvements-part2/)
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[Robin Marx](https://twitter.com/programmingart)
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Are you feeling like reading a detailed deep dive? Learn how exactly QUIC and HTTP/3 improve web performance.
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What’s better than a thorough explanation of the AVIF image format usage and benefits that include cats? Find out how to implement AVIF today with an open source tool, imgproxy.
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### [Does shadow DOM improve style performance?](https://nolanlawson.com/2021/08/15/does-shadow-dom-improve-style-performance/)
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[Nolan Lawson](https://github.com/nolanlawson)
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Why would shadow DOM could improve style performance? Is the speed gain worth using shadow DOM in your daily work?
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### [Building a resilient frontend using progressive enhancement ](https://www.gov.uk/service-manual/technology/using-progressive-enhancement)
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[GOV.UK](https://twitter.com/govuk)
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While it’s not a performance-oriented resource, building front-ends with resilience in mind improves user experience, accessibility and speed—a great list to live by.
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# Tools
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### [Vue Lazy Load Image Component](https://github.com/alexjoverm/v-lazy-image)
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[Alex Jover](https://twitter.com/alexjoverm)
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Are you using Vue.js? Use this component to lazy load an image automatically when it enters the viewport using the [Intersection Observer API](https://developer.mozilla.org/docs/Web/API/Intersection_Observer_API).
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