The power of cache in a slow world
summary
Claims concrete tactics: CDN Fastly runs varnish forks and accepts VCL, saving hundreds of milliseconds by avoiding the three‑way TCP handshake for repeated requests; real RTTs show ~250–350 ms to Sydney. Techniques include varnish VCL synthetic 666→200 to ack client actions and log for background processing, ESI for edge templating, stripping cookies into temp vars for cacheability, DNS TTLs and s‑Maxage / stale‑while‑revalidate directives, and short TTLs (even 1s) plus purge-by‑surrogate‑key.
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chapters (12)
- 0:00Intro
- 1:00Fastly
- 2:12Autonomous Systems
- 8:52Data Movement
- 10:50Speed of Light
- 11:03Cheating
- 11:25Cashman
- 11:37HTTP
- 14:23Varnish Cash
- 18:46Synthetic Responses
- 21:50Cached Dynamic Content
- 30:07Final Thoughts
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