Determine best way to track the moment where full Vue apps are setup
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Problem to solve
Currently the performance testing is checking times available through the Timings API:
We might want to track also moments after DOMready and even after window.onload.
We should find a way to track this globally on several pages but do it in a generic way, to not have to update the performance tests every time we have a new app
We can focus this effort on the MR page example but keep a generic approach.
Intended users
Developers that develop and make use of the performance automated testing.
Further details
Context: &805 (closed)
Proposal
Thinking of having a generic custom event that multiple Vue apps can use to record the moment the full app is setup in a global object so that the performance test script can check that like it does for the timing API.
Question: is one event enough? Should we track several moments and have the performance tool calculate deltas between them? Or leave that for a later improvement?
What does success look like, and how can we measure that?
Able to identify when an MR worsens the overall perceived performance or Time to Interaction with a full-fledged Vue app.