Simon Willison’s Weblog

High-end Varnish-tuning. Tuning the Varnish HTTP cache to serve 27K requests/second on a single core 2.2GHz Opteron.

Posted 20th October 2009 at 9:25 am

Recent articles

Large Language Models can run tools in your terminal with LLM 0.26 - 27th May 2025
Highlights from the Claude 4 system prompt - 25th May 2025
Live blog: Claude 4 launch at Code with Claude - 22nd May 2025

varnish 10 performance 89 caching 47 http 96

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe