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networks/dns-lookups-why-a-website-is-slower-the-first-time-you-visit.md
DNS lookups: why a website is slower the first time you visit
Typing a name like www.example.com sets off a short chain of questions: a resolver asks a root server, then a .com server, then the…
infrastructure/docker-build-cache-why-a-one-line-change-can-trigger-a-full-reinstall.md
Docker build cache: why a one-line change can trigger a full reinstall
You change one line of code, rebuild your Docker image, and wait while every library downloads again. Often the cause is just the order of…
computers/cpu-cache-why-reading-a-grid-by-rows-beats-columns-step-by-step.md
CPU cache: why reading a grid by rows beats columns, step by step
Two loops add up the same grid of numbers, yet one can run about ten times slower. The reason is a small, fast memory inside your processor…