Has something changed with "data transmission" since 16.04?

[Owen Thomas]

I am running two instances of a Java program that talk to each other on the
same machine using Java sockets. Since moving from 16.04 to 20.04, I have
noticed that these two instances establish connections and exchange data
perhaps at least 500 times faster. The increase in speed appears to be so
much that it appears I have had to measure transfer times in nanoseconds
instead of milliseconds because transfers, once taking about 88
milliseconds now might take about 150 microseconds.

Will similar transfer rates also be observed when I run each instance from
a separate machine as was the case when I was running under 16.04? Did
16.04 have a data transfer bottleneck that has been eliminated in later
releases?

I also moved JDK's from 8 to 11, and perhaps something changed there. (?)

Let me know thanks.

  Owen.

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