Image CDN: on-the-fly resizing and conversion, and when it pays off
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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BLOG · WEB PERFORMANCE
Analysis and insights
on real-world performance.
Method, real cases and tools to improve loading, responsiveness and stability, with no shortcuts for the tests.
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Responsive images with srcset and sizes: serving the right size to every screen
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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Optimizing image weight with conditional serving of optimized WebP or AVIF images
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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Lazy loading done right: when to defer images and when it is a mistake
Deferred loading reduces transferred data, but on the wrong image it worsens LCP: how loading=”lazy” works, which images to defer, how WordPress behaves and how to check it.
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