Hello all,
As you might already know, YSlow is a tool to check website performance, I just run a test against: http://en.wikipedia.org/wiki/Main_Page
Results is quite surprising, Grade F (47). Of course lower mark does not always means bad, but there are some room for improvement, e.g.
1. Minify JS (e.g. http://en.wikipedia.org/skins-1.5/common/ajax.js?179)
2. Enable GZip compression (e.g. http://en.wikipedia.org/skins-1.5/monobook/main.css?179)
3. Add expire header (e.g. http://upload.wikimedia.org/wikipedia/en/9/9d/Commons-logo-31px.png)
4. Don't put CSS out of the <head />
etc.
By do this, it should save some money on bandwidth, as well as to provide a better user experience.
Howard