Preloading Fonts and the Puzzle of Priorities
"Consider using <link rel=preload> to prioritize fetching resources that are currently requested later in page load" is the seemingly simple advice Lighthouse gives. Preload is a trade-off – when we explicitly increase the priority of one resource we implicitly decrease the priority of others – and so to work effectively preload requires authors to identify the optimal resources to preload, browse
Bypassing Cookie Consent Banners in Lighthouse and WebPageTest
When it comes to testing pages using Lighthouse, WebPageTest or other similar tools, cookie and similar consent banners are a pain! They can cause layout shifts, on mobile the banner is sometimes the element for Largest Contentful Paint (LCP), they visually obscure other parts of the page, and if implemented correctly only some of the page's resources will be fetched. When analysing sites one of m
How the Browser Pre-loader Makes Pages Load Faster
The pre-loader (also known as the speculative or look-ahead pre-parser) may be the single biggest improvement ever made to browser performance. During their implementation Mozilla reported a 19% improvement in load times, and in a test against the Alexa top 2,000 sites Google found around a 20% improvement. It’s not a new browser feature but some seem to believe it’s Chrome only and yet others sug
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Measuring the Impact of 3rd-Party Tags With WebPageTest
