webcheck.performance represents the overall performance of your synthetic test while webcheck.location.performance timeseries represent the individual performance of your synthetic test executed on a specific location, such as 'New York'. As a Webcheck also offers the possibility to define multi-step tests, such as 1.step: Login, 2.Step: Select product, 3.Step: Checkout; each of those steps also exposes its performance through the API.
Overall, you get pretty detailed and fine grained performance information for your defined Webchecks through API.
