We've been doing some performance testing and came across this great post Jai Haridas. Definitely worth a read!
http://social.msdn.microsoft.com/Forums/en-US/windowsazure/thread/d84ba34b-b0e0-4961-a167-bbe7618beb83
c6d6bb61-8ab0-44f5-88f6-817fac5063e8|1|5.0