The SpeedIndex is a time metic. If you run the SpeedIndex audit from 3 different locations and take the medium value. like speedcurve.com
Speed Index from Webpage Test.org
https://sites.google.com/a/webpagetest.org/docs/using-webpagetest/metrics/speed-index
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votes
philip.meyer
shared this idea
This is an interesting website load time indicator but it requires browser simulation and is much more complicated and expensive to compute, that’s why there are dedicated and expensive tools to do just that. This won’t happen in updown.io.