What are the real benefits of using external css and js in terms of page loading speed?

Question

What is the real benefit of using external css and js instead of putting the code directly in ... and in terms of page loading speed?

if we control the whole site from one header.php / aspx file? Using external files speeds up page loading?

My question is related only to page loading speed.

Answer 1

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Answer 2

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Answer 3

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http://articles.sitepoint.com/article/indexing-limits-where-bots-stop

Answer 4

yes, css and js files will be cached by the browser so that they only load once.