What are the performance differences between the following three, assuming they work in a semantic manner:
<link rel="stylesheet" href="one.css" />
<link rel="stylesheet" href="two.css" />
and:
<link rel="stylesheet" href="oneandtwo.css" />
and:
<link rel="stylesheet" href="combine.php?combine=one,two" />
Is there any major disadvantage to combining resources upon request, from a server load and user latency standpoint?