BLOG · WEB PERFORMANCE
Method, real cases and tools to improve loading, responsiveness and stability, with no shortcuts for the tests.
The same URL can serve AVIF, WebP or JPEG depending on what the browser supports: how negotiation with the Accept header works, why Vary: Accept is essential and…
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With ETag, Last-Modified and conditional requests the server answers 304 without transferring the files again: how it works, when it helps TTFB and crawl budget, and the mistakes…
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External CSS pays off thanks to the cache, but many visits stop at the first page; going all inline bloats the HTML. Critical CSS resolves the trade-off: a…
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Reducing a font to only the characters you need can cut its weight by 90%: what subsetting is, how to do it with pyftsubset, how to load fonts…
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Enabling Cloudflare does not mean your pages are cached: the difference between a CDN and a Full Page Cache, how to check it, cache rules, APO for WordPress…
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Four tools, four verdicts on the same page: what Pingdom, GTmetrix, WebPageTest and PageSpeed Insights measure, why they disagree and which combination is the industry standard.
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Same engine, different numbers: what sets PageSpeed Insights apart from Lighthouse, why the scores do not match and which tool to use for each question.
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The cookie banner can become the LCP element, shift the content and slow down the first click: how it happens and how to implement consent in a compliant…
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From conversion rate by speed band to margin, from scenarios to maintenance costs: an honest method for estimating the return on a performance project and presenting it to…
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