Chapter 2 GatherinG requirements Pages load = resource download + service calls • Where resource download is average time taken to download resources like Cascading Style Sheets (CSS), Hypertext Markup Language (HTML), scripts, and images, etc.; and service call is average time required by the web services to return data from the server. • You need to build a service call workload profile for all the services calls impacting the particular page. • Transaction time: The average time taken for key transactions, for example, average time taken by account and transaction services to fetch the data as well as other resources (e.g., CSS, HTML, scripts, and images). • Search completion time: The average time taken by the search module to provide the top ten results. Performance Testing: The DXP application must fit performance levels and delivery times on the agreed SLA (service level agreement) for stress testing to be planned and performed. • Load testing and stress testing will be performed on the BXP portal pages to certify that the critical performance requirements are met. • The pages will be performance tuned to guarantee that the response time is within 2 to 4 seconds for all the pages under average production load. • The target CPU utilization will be under 25%. • The LoadRunner application will be used to perform load testing. 49