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core(scoring): update TBT score curve #12576

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merged 3 commits into from
Jun 1, 2021
Merged

core(scoring): update TBT score curve #12576

merged 3 commits into from
Jun 1, 2021

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paulirish
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@paulirish paulirish commented May 27, 2021

Part of #11866

Updates the Total Blocking Time control points to be closer to the intended methodology laid out in https://web.dev/performance-scoring/#metric-scores

In addition, if we were picking entirely new control points, the May 2021 HTTP Archive run gives

HA p08 - 19ms
HA p25 - 189ms

But we think these as our control points would be too jarring and aggressive for now. Still, there's room to improve, so we're doing a small shift of TBT being scored more strictly.

p10: 200
median: 600

image

Desktop remains unchanged.

scoring: {
p10: 287,
p10: 200,
median: 600,
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why not drop the median down a bit too?

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Reducing it would exacerbate the effect of variance. This scoring curve has the biggest slope of all of the metrics, so I'm wary to increase the slope even more.

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4 participants