If there is one area where you can start a fight between computer geeks, it is with the word performance. For this discussion, we will define two basic types of performance: measured and perceived:
Measured performance involves using a formal set of metrics to determine the ability of a system to provide a specific service within a certain set of criteria. Note that one of the more important of these criteria is time.
Perceived performance is how the end user reports the ability of a particular system or service to execute a series of tasks.
Both types of performance definitions can be used to determine how a particular system or service is performing. Normally, measured performance ...