͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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Most of us believe that web performance is critical. But sometimes, it isn’t easy to convince someone else to share that belief. One of the reasons for our struggle is how we approach and frame this conversation.
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The introduction of web performance is often fueled with negativity—showcasing and critiquing poor user experience in a non-empathetic and non-constructive way. Meeting that negativity without understanding and knowledge about speed is confronting. What am I doing wrong? Why are things so horrible?
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We *need* to use our expertise to educate and lift others, not talk them down.
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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 Convince Your Boss to Care About Speed](https://calibreapp.com/blog/convince-your-boss-about-performance)
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[Karolina Szczur](https://twitter.com/fox)
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Are you finding it hard to convince your manager, boss or client that investing time and money in optimising web performance is worth it? Here’s how to approach those conversations and be successful!
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### [Why should 73% of Polish websites have a closer look at their mobile user experience?](https://www.thinkwithgoogle.com/intl/en-cee/marketing-strategies/app-and-mobile/why-should-73-of-polish-websites-have-a-closer-look-at-their-mobile-user-experience/)
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[Piotr Kowalski](https://www.linkedin.com/in/piotr-kowalski-054604/)
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Have a look at how most-visited Polish sites fare with Core Web Vitals thresholds in this report compiled based on CrUX data.
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### [Best practices for cookie notices](https://web.dev/cookie-notice-best-practices/)
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[Katie Hempenius](https://twitter.com/katiehempenius)
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It’s easy not to think much of cookie notices, but they can significantly affect performance and user experience. Learn how to avoid common design and implementation mistakes.
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### [How To Make Tree Shakeable Libraries](https://blog.theodo.com/2021/04/library-tree-shaking/)
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[François Hendriks](https://twitter.com/fr_hendriks)
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Tree shaking is a reliable performance strategy to reduce the size and impact of your JavaScript. But how do we write tree-shakeable libraries?
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# Browsers
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### [QUIC and HTTP/3 Support now in Firefox Nightly and Beta](https://hacks.mozilla.org/2021/04/quic-and-http-3-support-now-in-firefox-nightly-and-beta/)
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[Dragana Damjanovic](https://www.linkedin.com/in/dragana-damjanovic-91a48820/)
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Firefox is nearly HTTP/3 ready! HTTP/3 will be available by default by the end of May in stable versions, but you can test it out in Beta and Nightly.
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# New in Calibre
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### [Release Notes: March](https://calibreapp.com/blog/release-notes-mar-2021)
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Here’s our monthly roundup of what was released in March: new testing regions, better way to manage people within your organisation, updates to React Live Chat Loader and more.
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