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.
In the real world, roughly nobody gets theoretical maximums. That means that if we take the GSMA numbers about connection types at face value (https://www.gsma.com/mobileeconomy/ ), we end up wanting to calibrate expectations conservatively.
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So like I mentioned in the post, we see lots of different things base on the data source and the market.
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Also, data freshness is a challenge here. Some of our internal data sources show median RTTs north of 400ms in the markets growing fastest.
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