It is a fact that end user response time is critical for business success. The faster web pages are perceived the longer users tend to stay on the page and therefore spend more money and drive business. In order to ensure that end user response times are acceptable at all times it is necessary to measure the time in the way the end user perceives performance. Measuring and monitoring your live system is important to identify problems early on before it affects too many end users. In order to make sure that web pages are fast from the start it is very important to constantly and continuously measure web page performance throughout the development phase and in testing. There are two questions that need to be answered: * What is the time the user actually perceives as web response time? * How to measure it accurately and in an automated way? Here are the answers to these two questions