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Something interesting to do is see the source for google.com, msn.com

Compressed really well and built for speed. Then view the source at yahoo.com

Links to look at for performance. yslow http://developer.yahoo.com/yslow/

page speed http://code.google.com/speed/page-speed/docs/rules_intro.htm...

This is a total micro-optimization at best. Nearly every client is going to support compressed content. The difference between minified then compressed and unminified and compressed is tiny.

You are right though the difference probably does matter on the scale of Google, MSN, and Yahoo, but I wouldn't focus on it for my site.

15% of clients don't do compression, usually because of "internet security" software altering the Accept-Encoding header.

From the talk you linked to in another comment... http://en.oreilly.com/velocity2010/public/schedule/detail/11...

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