There's a reason I give PMs and managers slow phones. Those are the people who need to be convinced that performance matters, not (usually) the engineers. When management minds change, so does team practice and culture.
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It's super difficult for individual engineers and designers to advocate effectively for users without org support. Making space for that is the big challenge in most teams. Nobody wants to do a bad job, and the definition of "good" is not set individually.
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These are complex interactions! Tools like Lighthouse provide _visibility_ to what was previously invisible. But they are not talismans. Saying "X gets 100 on LH" is specifically meaningful, but only when quantified (which hardware? which test environment? where in the network?)
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And, as a statement about success over time, "X gets 100 on LH" is functionally meaningless. The important question is: in projects where X is involved, what's the probability of a good LH score over the project's lifespan (again, situated in network/device/topology).
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Many a disappointed partner team has enthusiastically told me about their super-fast starting-point. Then we put the real site on the bench, with real hardware, with real link conditioning. Turns out, point-in-time visibility isn't worth very much if you don't keep looking.
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Replying to @mjackson
https://www.webpagetest.org/easy will run a LH analysis if you ask it to (bottom checkbox, "Run Lighthouse Audit"):pic.twitter.com/YDzlvAlWAF
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Replying to @slightlylate @mjackson
As this thread started about Gatsby, here's a public-sector site built on this stack, running through WPT/easy in this config: https://www.webpagetest.org/result/190829_F7_a00e889c76d1c198ec401361ec901904/ …
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Replying to @slightlylate @mjackson
What's different about this run vs. opening up devtools locally is: 1.) the location in the network (this is in a rack in Dulles, VA thanks to the generosity of
@patmeenan) 2.) the quality of the network emulation. WPT uses dummynet: https://github.com/WPO-Foundation/wptagent#traffic-shaping-options-defaults-to-host-based … 3.) the hardware2 replies 0 retweets 7 likes -
Specifically, WPT drives Chrome in this config on a *real MotoG4*: https://www.gsmarena.com/motorola_moto_g4-8103.php …
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Here's the resulting LH report: https://www.webpagetest.org/lighthouse.php?test=190829_F7_a00e889c76d1c198ec401361ec901904&run=3 …
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WPT also gives you the timeline paired with screenshots and video. If you click "filmstrip view" here on one of the test runs: https://www.webpagetest.org/result/190829_F7_a00e889c76d1c198ec401361ec901904/ … You can see the scrubbable waterfall: https://www.webpagetest.org/video/compare.php?tests=190829_F7_a00e889c76d1c198ec401361ec901904-r%3A3-c%3A0&thumbSize=200&ival=100&end=full …
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...and generate video: https://www.webpagetest.org/video/view.php?id=190829_543b6196144502098b95ce61e61eec1f17f5d3ea …
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