Issue #33—Decipher WebPageTest results, understand your users through the lens of performance, the state of video and more.
#### PerformanceNewsletter #### Issue 33 #### Editor’s Note Often, we lean on performance metrics a lot. It makes sense—they were created to aid us in...
Issue #32—Investigating animation performance with DevTools, fixing layout instability, responsive image optimisation CDNs and more.
#### PerformanceNewsletter #### Issue 32 #### Editor’s Note We’re big advocates of choosing the right performance metrics to ensure they portray *real* user...
Issue #31—How web content affects power usage, everything you need to know about resource hints, making Instagram faster and more.
#### PerformanceNewsletter #### Issue 31 #### Editor’s Note The perception and definition of web performance are changing. We no longer remain solely focused...
Issue #30—Tackling third-party JavaScript, rendering on the Web, performance and accessibility are the baseline and more.
#### PerformanceNewsletter #### Issue 30 #### Editor’s Note Discussions about web performance are entering the mainstream. While they might not be focused on...
Issue #29—Largest Contentful Paint, loading CSS asynchronously, understanding Time to First Byte and more.
#### PerformanceNewsletter #### Issue 29 #### Editor’s Note The world of performance metrics can be deeply confusing. Which ones are always mandatory to...
Issue #28—Fast software is the best software, stale while revalidate, optimising GIFs and more.
#### PerformanceNewsletter #### Issue 28 #### Editor’s Note One of the reasons I find web performance to be a pillar of the way we design and build for the...
Issue #27—Reducing Intercom bundle size by 65%, the intersection of performance and accessibility, becoming a performance empathy advocate and more.
#### PerformanceNewsletter #### Issue 27 #### Editor’s Note Accessibility and performance *seem* like two vastly separate areas, but in reality, **they...
Issue #26—How does Google PageSpeed work and affect SEO rankings, the cost of JavaScript in 2019, find a cost of adding an npm package and more.
#### PerformanceNewsletter #### Issue 26 #### Editor’s Note A lot of our customers and performance advocates out there struggle with the same question: *How...
Issue #25—The real impact of image optimisation, gain speed with variable fonts, accessibility for everyone and more.
#### PerformanceNewsletter #### Issue 25 #### Editor’s Note We’re working hard to release a few major features to Calibre, one of them being **Insights**—a...
Issue #24—Webfont loading in Google Fonts, Lighthouse 5.0.0 and zero parse and compile for JavaScript.
#### PerformanceNewsletter #### Issue 24 #### Editor’s Note We’re currently recovering after a few intense days spent at the last edition of...
Issue #23—Paint holding, visualising third party scripts and performance privilege
#### PerformanceNewsletter #### Issue 23 #### Editor’s Note As every year, there are plenty of announcements in the performance, SEO and user experience...
Issue #22—Netflix’s web performance case study, new WebAssembly compiler and runtime, WASI Core and more!
#### PerformanceNewsletter #### Issue 22 #### Editor’s Note April marks the third anniversary since the announcement of Calibre. 🎉 **We’re 100% employee-...
Issue #21—The ethics of web performance, HTTP/3, faster promises and async functions, Google Lighthouse 4.0 and more!
#### PerformanceNewsletter #### Issue 21 #### Editor’s Note **Last year was huge for Calibre. **Since starting in 2017 we’ve seen more and more teams...
All about Time to Interactive, WASM, How HTTPs Ruined everything, and more!
#### PerformanceNewsletter #### Issue 20 #### Editor’s Note It hasn't been long since the last perf.email, but we enjoyed the articles below so much that I...
Issue 19—Native Lazy Load, Perceived performance, measuring layout and more!
#### PerformanceNewsletter #### Issue 19 #### Editor’s Note It's been a while since the last performance newsletter — we’ve been hard at work growing...
Issue 18—The cost of third-party scripts, performance auditing, variable fonts and more!
#### PerformanceNewsletter #### Issue 18 #### Editor’s Note Tomorrow the General Data Protection Regulation comes into effect. We see this as an essential...
Issue 17—sustainable technology, how healthy is the Internet, Chrome reduces parse and compile by almost 40% and more!
[](https://perf.email/) #### PerformanceNewsletter #### Issue 17 #### Editor’s Note You might have noticed a few changes. Perf.email was always published...
Issue 16—Building performance culture, revenue impact calculator, lazy loading images and video, automating performance systems and more!
Performance Newsletter PRESENTATION # Build performance for the long-term In February, [Allison McKnight](https://twitter.com/aemcknig), a Data Analytics...
Issue №15—Front-end Performance Checklist, Safari and Webpack performance upgrades, #perfMatters Conference and more!
Performance Newsletter RESOURCES # Front-end Performance Checklist for 2018 Smashing Magazine is continuing their performance advocacy with an incredibly...
Issue №14— Fontastic web performance, async CSS, why performance efforts fail and more!
Performance Newsletter OPEN SOURCE # Loading CSS asynchronously with preload Remember the newly released specification allowing us to prioritize and prefetch...
