tedster - 5:36 pm on Jul 30, 2010 (gmt 0)

where can I find specs on this that you would recommend reading. 'correct cache control headers '

A good starting place is [developer.yahoo.com...] - this is the documentation for Yahoo's YSlow tool. It's an interesting note that Steve Souders [stevesouders.com] did most of the speed research while he was at Yahoo and then was hired at Google.