Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?
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Notes -
If you're doing TCP, even small amounts of latency can have bizarre impact when you're dealing with relatively large bandwidth compared to the underlying MTU size, window size and buffer size (and if going past the local broadcast domain, packet size, though getting any nontrivial IPv6 layout to support >65k packets is basically impossible for anyone not FAANG-sized). I can't say with much confidence without knowing a lot about the specific systems, and might not be able to say even with, but I've absolutely seen this sort of behavior caused by the receiving device taking 'too long' (eg, 10ms) to tell the sender that it was ready for more data, and increasing MTU size and sliding window size drastically reduced the gap.
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