͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
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#### Editor’s note
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Choosing the right format of a file and appropriately serving it can make or break the performance of a page. That’s why the increased adoption of new image formats, such as AVIF, is exciting. We can use high-quality imagery with the fraction of the size.
Also, with dedicated image CDNs, we can ensure fallbacks for less supported modern formats, have semantic markup and serve media from the closest location to the viewers of your sites. And since imagery is present on 99.9% of websites, it’s a worthy task to take on.
We have the tools to make the web fast—let’s keep working on it.
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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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# Case Studies
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### [How redBus improved their website's Interaction to Next Paint (INP) and increased sales by 7%](https://web.dev/redbus-inp/)
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[Amit Kumar](https://amitkumar-v.medium.com/) & [Saurabh Rajpal](https://twitter.com/saurabhrajpal)
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Learn how redBus identified latency issues caused by client-side, blocking JavaScript tasks and API network calls and worked on improving their Interaction to Next Paint metric.
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# Browsers
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### [What’s new in Safari 17](https://murshidmuzamil.com/blog/safari-17/)
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[Murshid Muzamil](https://murshidmuzamil.com/)
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Fair few performance news from the Safari 17 release. Safari 17 supports JPEG XL, a new, modern image format, preconnect via Early Hints and fetch priority.
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# Courses, Talks & Podcasts
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### [Improving performance for 3 million web sites](https://www.youtube.com/watch?v=yW_4A4pTPA4&ab_channel=NYWebPerformanceMeetup)
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[Michael Gooding](https://www.linkedin.com/in/mgooding1981/)
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The Merchant Performance team is a new team at Shopify working on speed. Check out this talk to find out what they learned over the past year, what their focus is and the challenges of optimising performance for a flexible no code solution.
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