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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Web performance is not just TTFB: a reply to “Showing off with a PageSpeed score of 100”
The founder of Iweblab claims that TTFB “says next to nothing” and that only green on CrUX matters. But his Edge network is slower than a site with…
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Bots, scrapers and unwanted traffic: when the slowdown does not come from users
Aggressive crawlers, AI bots and automated scans can saturate the server without showing up in analytics: how to recognize them in the logs and filter them with robots.txt,…
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Server load during traffic spikes: performance under stress during sales and campaigns
What happens when traffic multiplies, how to estimate a site’s capacity, how to run a realistic load test and how to prepare site and infrastructure for Black Friday…
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Hosting and Core Web Vitals: shared, VPS, managed or cloud, what really changes for TTFB and traffic spikes
What depends on hosting and what does not, how shared, VPS, managed WordPress and cloud differ, and why comparisons must be made on dynamic pages and under load.
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The WordPress database that slows everything down: autoload options, transients, revisions and slow queries
Autoloaded options, metadata without indexes, revisions, transients, sessions and logs: how the database slows down WordPress dynamic pages, how to diagnose it and how to clean it up…
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HTTP 304 Not Modified: don’t resend what the browser already has
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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Object cache with Redis: when WordPress really needs it (and when it doesn’t)
The difference between page cache and object cache, the pages where Redis can halve response time, the cases where it is not needed, and how to configure it…
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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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THE NEXT STEP
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