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core(scoring): tweak performance weights #5083

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merged 2 commits into from
May 2, 2018
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patrickhulce
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closes #4629

tweaks the performance score weights according to https://docs.google.com/document/d/1XiKdkLgWul0l40slhkCmQufNdjUiTlq3H_EAjrBH5Cw/edit#

I ran the weights and new thresholds for what we have in HTTPArchive and got the distribution, it's pretty aggressive.

Median: 27
75th Percentile: 43
90th Percentile: 69
95th Percentile: 83
99th Percentile: 98

Roughly 3% of sites get a 90+
Roughly 0.08% of sites get a 100

I'm disappointed new rolling window EIL won't get any credit, but that'll give us time to take a look at the distribution of the new definition and adjust score thresholds without impacting the overall perf score, and this is aggressive enough as it is :)

@paulirish paulirish mentioned this pull request May 1, 2018
82 tasks
{id: 'interactive', weight: 5, group: 'perf-metric'},
{id: 'speed-index', weight: 1, group: 'perf-metric'},
{id: 'estimated-input-latency', weight: 1, group: 'perf-metric'},
{id: 'first-cpu-idle', weight: 2, group: 'perf-metric'},
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nbd but why did the order change?

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oh just aligning more with the order presented over there, I have no opinion I can revert

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need to update the golden LHR it looks like, but otherwise LGTMmmmm

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BY ORDER OF THE COMMITTEE

@patrickhulce patrickhulce merged commit 8fcbb84 into master May 2, 2018
@patrickhulce patrickhulce deleted the tweak_perf_score branch May 2, 2018 03:02
kdzwinel pushed a commit to kdzwinel/lighthouse that referenced this pull request Aug 16, 2018
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Perf Metrics & Scoring vNext
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