core(scoring): update TBT score curve #12576
Merged
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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
Desktop remains unchanged.