Sgt_Kickaxe - 8:52 pm on Nov 6, 2010 (gmt 0)
AdSense on all of them is slower than my pages!
I ran a webpagetest on one of my sites that had high accuracy estimates and found out that the adsense was to blame. Adsense was in fact shocklingly slow, ranging from 400ms to 600ms per load which is rediculous.
I had the adsense spread over the page and used the 3 units, 2 link units maximum so I was able to reduce my adsense load by eliminating 1 ad unit and 1 link unit, both from the bottom/sidebar of the page.
Earnings loss wasn't much but page speed was noticeably faster in the next few tests. 7.3 seconds is something to worry about but don't take that value as fact, run a few webpagetest(.org) to see what the real values (and real slowdowns) are.