Why TTFB alone won't tell you what's actually slow
A lower TTFB does not guarantee a faster page, and a higher one does not guarantee a slower one. Cloudflare has the data to prove it. Here is what to measure instead.
Posts tagged with Web Performance
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HSTS preload is a one-way street: what removal actually takes
Most guides say removal "takes months." The real number, from the official removal page, is 6 to 12 weeks to reach most Chrome users, and Firefox and Safari run their own separate clocks entirely.
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504 vs 503: what actually triggers each in nginx, Cloudflare, and ALB
503 means a server is deliberately not serving right now. 504 means something upstream never answered in time. The trigger conditions for each are different in nginx, AWS ALB, and Cloudflare, and none of them share the same defaults.
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The Cache-Control directives map: no-store, no-cache, private, must-revalidate
Five directives, one table, and four ways getting one of them wrong actually breaks a site: a personal page cached on a shared CDN, a logged-out user seeing a previous session on the back button, and two more.