͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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One of the hurdles in improving web performance is how contextual it is. There’s a lot of catch-all advice that might be relevant to you, but often, especially with more complex applications and sites, that advice isn’t appropriate anymore.
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At some point in our performance journey, we have already implemented all the strategies to speed up our custom fonts or lazy load images. None of the off-the-shelf advice is sufficient. What’s left is complex debugging, significant rewrites as well as lots of trial and error.
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For this reason, we must leverage automated workflows that will ensure our baseline performance remains intact so that we can focus on more significant issues that can’t be outsourced. Automate the tedious, focus on the most impactful.
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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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### [Reducing the Site-Speed Impact of Third-Party Tags](https://andydavies.me/blog/2020/10/02/reducing-the-site-speed-impact-of-third-party-tags/)
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[Andy Davies](https://twitter.com/andydavies)
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Third Party tools can and most likely will ruin your performance benchmarks. Learn how to audit your third parties and mitigate their impact.
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### [How to Improve Core Web Vitals](https://simonhearne.com/2020/core-web-vitals/)
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[Simon Hearne](https://twitter.com/SimonHearne)
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Core Web Vitals, three new user experience metrics that will affect your SEO, are here to stay. Find out how to improve yours.
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### [Please stop using CDNs for external Javascript libraries](https://shkspr.mobi/blog/2020/10/please-stop-using-cdns-for-external-javascript-libraries/)
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[Terence Eden](https://twitter.com/edent)
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Using CDNs to host JavaScript libraries looks beneficial on the surface, but in reality, carries significant risks and questionable performance gains. What happens if someone hacks your CDN?
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# Tools
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### [Compress Your Images in GitHub with Image Actions 2.0](https://calibreapp.com/blog/image-actions-2.0)
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[Karolina Szczur](https://twitter.com/fox)
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Did you know you can compress imagery directly in your pull requests? We made substantial improvements to Image Actions, so you can create powerful optimisation automations without leaving GitHub.
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# Browsers
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### [Chrome is deploying HTTP/3 and IETF QUIC](https://blog.chromium.org/2020/10/chrome-is-deploying-http3-and-ietf-quic.html)
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[David Schinazi](https://twitter.com/dschinazi), [Fan Yang](https://www.linkedin.com/in/fan-yang-09a61348) & [Ian Swett](https://www.linkedin.com/in/ian-swett-177597/)
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Chrome is rolling out support for IETF QUIC, which significantly outperforms HTTP over TLS 1.3 over TCP. HTTP/3 and its performance gains are coming!
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# New in Calibre
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### [Release Notes: September](https://calibreapp.com/blog/release-notes-sep-2020)
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Here’s our monthly roundup of what was released in September: Accessing and exporting your performance data with ease, Test Duration metric and more.
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