͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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Sometimes, it feels like there’s an ongoing tension between synthetic (lab) and real user monitoring (field) tools to prove one’s dominance. The truth is, they are two different means to achieve different goals.
When I employ a tool to help me (or my team), I evaluate it’s solving and the expected results. Why wouldn’t we judge synthetic and RUM in the same way? They aren’t competing. They’re great together! Synthetic lets me reproduce speed issues and implement proven improvements. RUM brings me as close to the viewer and their experience as possible.
When we get wrapped up in tool debacles, we forget our end goal: creating the most accessible and fast user experience.
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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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### [Find your way with field data in the Web Vitals extension update](https://web.dev/field-data-in-the-web-vitals-extension/)
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[Rick Viscomi](https://twitter.com/rick_viscomi)
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The Web Vitals extension for Chrome is updated to show how local experiences compare to real user experiences in the field. You can understand how edge cases are handled and where the data comes from, too.
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### [Making A Strong Case For Accessibility](https://www.smashingmagazine.com/2021/07/strong-case-for-accessibility/)
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[Todd Libby](https://twitter.com/toddlibby)
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Often, making a case for prioritising accessibility work is hard. Similarly to web performance, we need actionable steps and strategies to win. Know how to help your team adopt new principles and improve access.
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# Case Studies
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### [How Real User Monitoring will improve GOV.UK for everyone](https://insidegovuk.blog.gov.uk/2021/06/16/how-real-user-monitoring-will-improve-gov-uk-for-everyone/)
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[Matt Hobbs](https://twitter.com/TheRealNooshu)
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Both synthetic and real user monitoring can help improve user experience. This is an excellent read on motivations behind using Real User Monitoring and the questions this methodology answers for GOV.UK.
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# Browsers
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### [RenderingNG: Ready for the next generation of web content](https://developer.chrome.com/blog/renderingng/)
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[Chris Harrelson](https://twitter.com/chrishtr)
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What’s the future of browser rendering engines? Learn about the upcoming changes to Chromium rendering architecture and what does it mean for performance and reliability.
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# Talks & Podcasts
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### [Top 10 performance pitfalls](https://www.youtube.com/watch?v=Lh9q3h2khlc&list=PLNYkxOF6rcIAKIQFsNbV0JDws_G_bnNo9&index=3)
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[Jake Archibald](https://twitter.com/jaffathecake) & [Surma](https://twitter.com/DasSurma)
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Do you know what the most common performance issues are? Learn about poor inlining strategies, over-bundling and more.
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