Let’s make the web faster – Google Code.
Some choice excerpts:
CSS: Using every declaration just once
Using every CSS declaration only once is an effective way to reduce file size of style sheets. It’s not a trivial optimization technique though: Watch over the cascade and adjust your editing workflow.
HTTP caching
Web pages can load much faster on repeated visits if the resources come from the cache. Learn about two groups of HTTP headers that make all the difference.
Optimizing web graphics
Optimizing your web illustrations, icons, and graphics is one of the simplest yet most effective ways to decrease your page load time. In this tutorial, we discuss image file formats and optimize some real Google graphics for faster download on the web.