Which is faster?

Which is faster?

Hello I was just wondering if anyone could let me know which is faster.....

  a) link to jquery folder e.g. src="jquery-1.4-min.js"></script>

or b) use google cdn eg. src="http://;ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js"></script>


of if there are significant advantages of one method over the other.

Thanks in advance

Vicky