[wp-trac] [WordPress Trac] #57687: Add automated performance testing CI workflow MVP

[WordPress Trac]

#57687: Add automated performance testing CI workflow MVP
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 Reporter:  adamsilverstein   |       Owner:  mukesh27
     Type:  enhancement       |      Status:  assigned
 Priority:  normal            |   Milestone:  6.3
Component:  Build/Test Tools  |     Version:  trunk
 Severity:  normal            |  Resolution:
 Keywords:  needs-patch       |     Focuses:  performance
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Comment (by flixos90):

 Replying to [comment:4 oandregal]:
 > In https://github.com/WordPress/gutenberg/pull/48288 I'm proposing to
 add a new metric to Gutenberg's front-end performance suite: LCP-TTFB. I'm
 unaware of any industry metric that tracks the same thing, I'll be happy
 to adapt if there's any.

 +1 to using LCP-TTFB. I have been using this in several benchmarks before
 when it comes to assessing client-side changes specifically.

 One thing to pay attention to is to get the median right: We need to
 compute LCP-TTFB for every run and then take the median of those values,
 not take the median LCP and median TTFB and use those.

 I'm sure you mention my numbers mainly as an illustrative example for your
 calculation, but just to clarify that that calculation technically
 computes the median in the incorrect way (although I think at a high level
 we will still note the major client-side performance benefit for block
 themes either way, which is great to see).

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Ticket URL: <https://core.trac.wordpress.org/ticket/57687#comment:5>
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