As long as your resource is bound to a particular user action, you can see it in the waterfall analysis for a user action and compare your values.
I don't think you can chart the load time now measured from UEM. You can chart the server response time for an individual request (you need to have the request marked as key request), but it's measured on the server-side. There are custom metrics for UEM coming later this year, but I'm not sure if you will be able to define a loading time for a single resource as a metric.
Hi @Julius L.
Thanks for your answer
The problems are:
1. The JS they want to monitor is spread all around their user actions
2. From the water fall analysis for one user action you can get the timing for very short period of time
Any how thanks