DNS, TLS and connections: the milliseconds before the first byte
Redirects, DNS resolution, TCP and TLS negotiation: how much the phases before the first byte cost, why they are part of users’ TTFB and how to reduce them…
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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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Brotli, Gzip and Zstandard compression: how much the text of your pages really weighs
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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Preload, preconnect and fetchpriority: how to tell the browser what really matters
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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HTTP/3 and QUIC: what changes for speed on mobile networks
Fewer round trips to open the connection, no chain blocking when a packet is lost, connections that survive a change of network: what HTTP/3 brings compared with HTTP/2,…
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Early Hints (HTTP 103): announcing critical resources while the server is thinking
With the 103 code the server or CDN tells the browser which resources to download while the page is still being prepared: how it works, when it pays…
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THE NEXT STEP
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