Performance

Articles and tools relating to web performance.

• Cache-Control for Civilians

  An in-depth exploration of how to use cache-control headers for optimal performance.

• JPEG XL and the Pareto Front

  An analysis of image size vs encode time for various image formats and encoders.

• Let's talk AVIF - and why we're not adding support just yet

  A look at AVIF's encode and decode performance.

• Make Jamstack Slow? Challenge Accepted.

  A very interesting article on common things that slow down sites, including tracking scripts.

• PageSpeed Insights

  Tool to check for, and suggest ways to improve, performance problems.

• Pingdom Tools

  Set of tools to analyse page load speed.

• Self-Host Your Static Assets

  A look at the performance of self-hosting vs using a CDN for third-party assets.

• A Smashing Guide to Performance

  A continually updated collection of guides on web performance.

• Web Fundamentals

  Google's training material on web performance.

• Is WebP really better than JPEG?

  An analysis of the perceptual performance of different image formats.