Having more number of CSS files results in more HTTP hits to Server. This will increase the page load time and decrease the performance. If we have more than 31 CSS files, the CSS will very likely break in Internet Explorer Browser. This problem is specific to IE Browser only.
This Video showcases how to optimize the number of CSS files in Drupal and increase the performance.
Related Videos::
Front End Optimization Part 2 :: http://bit.ly/K6mKb7
Front End Optimization Part 3 :: http://bit.ly/IwE4Re
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