Tips : Speed up a Drupal web site by enabling CSS file aggregation by  Nadeau Software

Speed up your web site by automatically combining multiple module and theme CSS files into one large file using Drupal's CSS file aggregation feature. The single large CSS file is more efficient to send to a visitor's browser, speeding up the site. The large file also has white-space removed, making it a bit smaller and faster to send. This article shows how to enable the feature and it benchmarks the performance improvement.

Table of Contents:
1. How to enable Drupal CSS file aggregation
2. What does it do?
3. How well does it work?
1. Effect on total CSS file size
2. Effect on total CSS load time
3. Effect on total page load time
4. When doesn't it work?
5. Conclusions
6. Further reading
7. Appendix: How I tested

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Courtesy : Nadeausoftware.com