͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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Wouldn’t it be nice to browse the web without endless ads, banners and layout shifts? With no auto-playing music and videos attacking your ears? Without endless waiting for things to load?
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I don’t know about you, but I’m tired of fighting slow, unusable websites and ads that bypass even the most sophisticated ad-blockers. ”Surfing the web” used to be fun. I don’t think it is anymore.
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We have the power to change this. Ask for motivation for changes. Offer feedback. Challenge stakeholders. Build a better, calmer and more respectful web.
It’s up to us.
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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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### [JavaScript performance beyond bundle size](https://nolanlawson.com/2021/02/23/javascript-performance-beyond-bundle-size/)
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[Nolan Lawson](https://github.com/nolanlawson)
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Bundle size is one of the most popularised JavaScript speed optimisations, but the script’s impact spans much further than just size. Learn what you might be missing when focusing only on bundles.
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### [Time for Next-Gen Codecs to Dethrone JPEG](https://cloudinary.com/blog/time_for_next_gen_codecs_to_dethrone_jpeg)
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[Jon Sneyers](https://twitter.com/jonsneyers)
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There are a handful of new-generation image codecs, each with its unique characteristics. Which one will be the best JPEG successor?
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### [Study Finds Bad Web Design is Killing Us All With Stress](https://au.pcmag.com/news/84535/study-finds-bad-web-design-is-killing-us-all-with-stress)
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[Eric Griffith](https://www.linkedin.com/in/ecgriffith/)
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Poor performance, dark UX patterns and website issues cause real stress. Slow-loading pages caused a 21% spike in blood pressure in the Cyber Duck UX Agency study participants.
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# Case Studies
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### [How I cut GTA Online loading times by 70% ](https://nee.lv/2021/02/28/How-I-cut-GTA-Online-loading-times-by-70/)
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[t0st](https://buymeacoffee.com/t0st)
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Remember Grand Theft Auto Online? Turns out it’s notorious for its slow loading times. Someone investigated the slowness and found the culprit—see how!
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# Tools
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### [Internet Speed Test: Measure Latency & Jitter](https://speed.cloudflare.com/)
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[Cloudflare](https://www.cloudflare.com/)
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Who doesn’t love a good speed test. Your download speed is only a part of the network connectivity picture. Visualise download, upload and latency.
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### [PageSpeed Insights uses http/2 to make network requests](https://developers.google.com/speed/docs/insights/release_notes?hl=en-US&utm_source=PSI&utm_medium=incoming-link&utm_campaign=PSI#march-3,-2021)
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Up until now, PageSpeed Insights (both the UI and the API) only supported HTTP/1.1. If your requests are served in H2, you will now see that speed impact portrayed in PSI.
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