Measuring performance of a performance measuring tool comprises: a first data loader acquiring a first set of network data for passing to a first data channel; the first data channel calculating a first set of performance metrics using the first set of network data and storing the first network data and performance metrics in a database; a first data viewer displaying the first set of performance metrics; time stamping all operations performed in one or more of the acquisition, calculation and storing steps and saving the time stamp and operation details in a log file; a second data loader acquiring the time stamped data; a second data channel, calculating a second set of performance metrics using the time stamped data, storing the time stamped data and second set of performance metrics in the database; and a second data viewer, displaying the second performance metrics from the database.