Performance
Articles and tools relating to web performance.
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A Smashing Guide to Performance
A continually updated collection of guides on web performance.
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Cache-Control for Civilians
An in-depth exploration of how to use cache-control headers for optimal performance.
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Is WebP really better than JPEG?
An analysis of the perceptual performance of different image formats.
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Let's talk AVIF - and why we're not adding support just yet
A look at AVIF's encode and decode performance.
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Make Jamstack Slow? Challenge Accepted.
A very interesting article on common things that slow down sites, including tracking scripts.
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PageSpeed Insights
Tool to check for, and suggest ways to improve, performance problems.
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Pingdom Tools
Set of tools to analyse page load speed.
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Self-Host Your Static Assets
A look at the performance of self-hosting vs using a CDN for third-party assets.
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Web Fundamentals
Google's training material on web performance.
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WebPageTest
Comprehensive tool for analysing page load performance and making recommendations for improvement.