First, as I'm sure you know, RTT dominates when it's high enough...and our metrics show it being quite high on these links. For the first few seconds (which is what we care about), you won't get full use of the link's available bandwidth.
We have a lot of data sources at Google and, frustratingly, they paint a conflicted picture. I spent most of a week digging into this late last year.
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The biases in the data are also important to tease out: we get disproportionately less Chrome User Experience Report data from users on the slowest links, e.g.
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Reports like the one you cited require methodological scrutiny. When someone reports observed available capacity that looks suspiciously close to theoretical HSPA+ capacity, something smells fishy.
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