Online shopping sites slow down under load

Keynote's performance Index showed consumers completed a transaction 95.98% of the time and response time was 15.03 seconds. This is slightly better than the previous week. But transactions on the worst performing site still failed almost 14 out of every 100 times the transaction was attempted. The index measures response time and success rate for executing a typical multistep online transaction on 13 leading retail Web sites including Amazon, eBay, BestBuy and Sears.