Ditto, I did the same thing as @fanoop and went to Pingdom and saw my clients site loading at 6-10 secs. However, I did not notice it right away and only noticed it about 3 weeks in.
Has anyone found a fix for this? Otherwise I am going to have to find another solution to s2Member. Besides, I was not impressed when it was all installed, and realized that you can only do one Click pay items, and not Shopping cart. If a user wants to buy more than one item, users have to pay and come back and pay again.