More capacity != faster speeds. "Speed" is relative to the distance your destination vs source is. Latency and jitter play part of this. Just because you have a bigger pipe doesn't mean its faster, just means you can cram more down it per second.
"Throughput" is a solution to a max windosw size and latency, the formula
TCP-Window-Size-in-bits / Latency-in-seconds = Bits-per-second-throughput
In other words, if you want better "speed" regarldess of throughput adjust your TCP window size on your system.
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