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22 September 2020

⚡️ 58: AVIF is here.

͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏
 
Performance Newsletter
[issue 58]()
 
#### Editor’s note
 
The speed of our products and sites often relies on external factors, well beyond the code we might write or design we might produce. Third party tools we include, which content delivery we use or even what browser is used by a viewer, as they differ in the implementation of certain, critical features, like resource prioritisation.
 
Speed regressions might come from many surprising places, but it’s our responsibility to identify and potentially mitigate them. While it’s easy to assign blame to a framework, tool or a browser, ultimately, we are the stewards of what gets delivered to the user and how their experience might feel.
 
Let’s optimise for speed, accessibility and delight.
 
Karolina
 
 
 
 
#### last call: we are hiring a front-end developer!
 

Are you an experienced Front-end Developer wanting to build interfaces for a [performance monitoring product](https://calibreapp.com/) with a small, but an impactful team that values work-life balance?

Find out more [here](https://calibreapp.com/careers/front-end-developer). **Applications close this Wednesday, September 23, 23:59 AEST.**

 
 
 
# Articles  
 
AVIF has landed
 
### [AVIF has landed](https://jakearchibald.com/2020/avif-has-landed/)
 
[Jake Archibald](https://twitter.com/jaffathecake)
AVIF is here. See detailed comparisons of the new image format in different cases and find out if implementing support right now is worth it.
 
Accelerating JavaScript (in the browser)
 
### [Accelerating JavaScript (in the browser)](https://hyphaebeast.club/writing/accelerating-js/)
 
[Jonathan Dinu](https://twitter.com/hyphaebeast)
There are several areas where JavaScript speed bottlenecks can be hiding. Learn what type of optimisation might be useful in addressing them.
 
Performance Metrics for Front-End Applications
 
### [Performance Metrics for Front-End Applications](https://blog.bitsrc.io/performance-metrics-for-front-end-applications-a04fdfde217a)
 
[Mahdhi Rezvi](https://twitter.com/MahdhiRezvi)
With a wide variety of performance metrics, it might be challenging to know which ones are most relevant to you. Refresh your knowledge and reevaluate your metric set.
 
 
 
# Case Studies  
 
Core Web Vitals – Wix vs. WordPress, Shopify vs. Shopware – What’s fastest?
 
### [Core Web Vitals – Wix vs. WordPress, Shopify vs. Shopware – What’s fastest?](https://www.sistrix.com/blog/core-web-vitals-wix-vs-wordpress-shopify-vs-shopware-whats-fastest/#20th_place_Website_access_from_England_needs_improvement)
 
[Johannes Beus](https://www.linkedin.com/in/jbeus/?originalSubdomain=de)
Is Wordpress slow? What CDNs are delivering fast sites? In what countries do users get the fastest webpages? Find out here.
 
 
 
# Talks & Podcasts  
 
Understanding Resource Priorities
 
### [Understanding Resource Priorities](https://noti.st/andydavies/Tw5Q3B/understanding-resource-priorities#savduTt)
 
[Andy Davies](https://twitter.com/AndyDavies)
Learn how browsers prioritise resources, how some of them adjust for network conditions, what part servers play and how the decisions we make as developers influence their behaviour.
 
 
# New in Calibre  
 
Find your Slowest and Fastest Pages, Understand Lighthouse Audits Better and More
### [Release Notes: August](https://calibreapp.com/blog/release-notes-aug-2020)
Here’s our monthly roundup of what was released in August: Finding your slowest and fastest Pages, Lighthouse 6.3.0, better Lighthouse audits and more.
 
 
Calibre
 
This email is brought to you by the team at [Calibre](https://calibreapp.com). Our performance monitoring platform helps you deliver stellar user experiences to everyone.
 
 

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