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by iso1210 2122 days ago
https://www.youtube.com/watch?v=QEIUdMiColU is an animation of how it's supposed to work, including latencies

There are enough satelites and low enough routing on the lasers to mean packets will arrive from London to NY faster than even a great-circle fibre.

In reality how much bandwidth is available is a function of money, and HFTs tend to have a lot of money.