Simon Willison’s Weblog

25th July 2007 - Link Blog

YSlow. New extension for Firebug (yes, an extension on top of another extension) from the Yahoo! performance team which provides improved performance measurement tools and optimisation advice.

Posted 25th July 2007 at 4:48 am

Recent articles

Hello Python 3.15, goodbye 3.10, and now I can use 3.11 - 12th October 2026
A new feature for my blog, built using my voice - 9th October 2026
Claude Haiku 5.5 - 7th October 2026
We're going to need default hard budget caps on pretty much everything - 3rd October 2026

This is a link post by Simon Willison, posted on 25th July 2007.

extension 2 firebug 22 firefox 102 http 125 optimisation 6 performance 95 yahoo 107 yslow 2

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