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Front-End Performance Checklist 2021

Smashing Magazine

Defining The Environment Choosing a framework, baseline performance cost, Webpack, dependencies, CDN, front-end architecture, CSR, SSR, CSR + SSR, static rendering, prerendering, PRPL pattern. Assets Optimizations Brotli, AVIF, WebP, responsive images, AV1, adaptive media loding, video compression, web fonts, Google fonts.

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Front-End Performance Checklist 2020 [PDF, Apple Pages, MS Word]

Smashing Magazine

Run performance experiments and measure outcomes — both on mobile and on desktop (for example, with Google Analytics ). Addy Osmani has written a very detailed write-up on how to start performance budgeting , how to quantify the impact of new features and where to start when you are over budget. Image source ).

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Front-End Performance Checklist 2019 [PDF, Apple Pages, MS Word]

Smashing Magazine

Luckily, there are many great options that help you automate the collection of data and measure how your website performs over time according to these metrics. Note: based on research by Patrick Meenan and Andy Davies, HTTP/2 is effectively broken on many CDNs , so we shouldn’t be too optimistic about the performance boost there.