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Method, real cases and tools to improve loading, responsiveness and stability, with no shortcuts for the tests.
Request phases, page events, chains, late-discovered resources, superfluous connections and network gaps: an eight-question method for reading the waterfall and finding the causes of a slow page.
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How an image CDN works, what it offers compared with plugins that optimize on the server, what the costs and risks for LCP are and how to tell…
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How HTTP compression works, how Gzip, Brotli and Zstandard differ, when to compress in advance and when on the fly, how to configure the server and what effect…
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How the browser picks an image variant, why a wrong sizes attribute makes it download files many times larger, when to use picture and how to handle it…
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dns-prefetch, preconnect, preload, prefetch and fetchpriority: how the browser decides priorities, when each hint speeds up the page and when it slows it down, with WordPress examples.
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DOM, CSSOM, render tree, layout, paint and composite: how the browser turns code into pixels, why CSS and synchronous scripts block the first paint and how to shorten…
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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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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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Heavy embedded players, hero videos without a poster, boxes without dimensions: how video affects LCP, INP and CLS and how to add it with facades, optimized posters and…
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