This is a bug in lighthouse
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Replying to @cramforce @slightlylate
Surely, it's less Lighthouse != Lighthouse and more synthetic throttling != real-world constraints. That Lighthouse runs in both contexts is a feature, but perhaps the key is for it to surface that synthetic results are indicative only?
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Replying to @aerotwist @slightlylate
If a score of 100 doesn't mean it is good, then that is a product issue. This would be possible to fix. Besides improving throttling, LH could run on real hardware. The latter is basically the way to buy a solution with money.
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Replying to @cramforce @aerotwist
To product quality, yes, I'm currently in the middle of writing an email suggesting much, much more conservative scoring. On HW, I've recommended as much for many years. The ~25 MotoG4's on WPT are there today because we (Chrome) bought them and
@patmeenan generously runs them.2 replies 0 retweets 4 likes -
Right, but what do you do with -- say -- Lighthouse as standalone, in DevTools, or as part of http://web.dev ? Adjusting scores makes some sense, but ultimately devs will need to run it on representative devices to get representative scores.
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It has been...challenging...for me to get folks to center performance claims and goals in the context of a specific and reproducible device/network config. I don't think enough engineers trace sites or work with partners.
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Replying to @slightlylate @aerotwist and
I think one of the most important pieces to focus on is RUM metrics so you actually get real data from your users and how much performance impacts the bottom line. I don't think enough engineers set SLOs around performance and measure what matters.
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Replying to @davidannez @slightlylate and
Even with RUM you have to be careful and account for abandons as part of "perf" since the population changes as perf changes (or just swings wildly for the heck of it)
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Replying to @patmeenan @davidannez and
Also only useful after you have shipped :(
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Replying to @patmeenan @davidannez and
Yep yep! I try to get managers to visualise their *marginal* customer. The one who they want to buy, but is most likely on the bubble because perf. What phone/network are they on? Said differently, what's the P95/P99 customer today? Are they your growth market?
3 replies 0 retweets 1 like
Sometimes, because of demographics -- kids have cheaper devices -- it's an emphatic "yes"...and sometimes (enterprise software not sold to govt, e.g.), it's a "no"
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