Mozilla has found that increasing the performance of their download page can dramatically increase their conversion ratio:

Let’s start with the punchline: By making a few minor tweaks to our top landing pages, we can drive an additional 60,000,000 Firefox downloads per year

With 275,000 daily visitors, a 15% improvement on this single English page translates to 10.28 million additional downloads per year. And, if we’re able to achieve a similar performance boost across our other top landing pages, we’ll drive in excess of 60 million yearly Firefox downloads.

How did they do it? By inlining javascript and css files… a technique we use extensively here at Core.

We make use of Minify, a php-based compressor and cache system that groups our css files and js files into as few separate documents as possible. It then compresses the files by removing whitespace, gzips them, and stores them for the next request.

It’s great to see documented improvements on such large sites as Mozilla. Keep up the good work!

http://blog.mozilla.com/metrics/2010/04/05/firefox-page-load-speed-–-part-ii/