Checkout this blog post for information on how to collect timing details about every page, test and transaction in your load test as well as generate 90th and 95th percentile data for the pages, tests and transactions: http://blogs.msdn.com/slumley/pages/how-to-get-90th-and-95th-percentile-information-as-well-as-timing-details-for-every-page-test-and-transcation.aspx