[wp-trac] [WordPress Trac] #59120: Measure interactivity metrics in performance tests

[WordPress Trac]

#59120: Measure interactivity metrics in performance tests
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 Reporter:  swissspidy        |       Owner:  (none)
     Type:  defect (bug)      |      Status:  new
 Priority:  normal            |   Milestone:  Future Release
Component:  Build/Test Tools  |     Version:
 Severity:  normal            |  Resolution:
 Keywords:                    |     Focuses:  performance
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Comment (by flixos90):

 On the one hand, I'd argue we don't need to measure TBT because FID and
 INP are far more meaningful.

 On the other hand, the reason TBT is used in some tooling is because it's
 the only way to reliably get a glimpse of interactivity in automated
 tests. The problem with both FID and INP is that they require actual
 interactions to happen. How could we implement that in a way that works
 across our test suites? What would the interactions be that we implement?
 I feel like this may end up an arbitrary decision, so I'm not sure about
 how feasible it is.

 In other words, I think we should implement ''either'' FID and INP ''or''
 TBT. The first one would be ideal, but the latter may be realistically the
 only option.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59120#comment:2>
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