Get and install "wireshark"
Capture the traffic
Look for any unusual TCP stuff (retransmissions, etc)
Look for dead times
Move a pin on your routines entry point
Watch those pins toggling on an oscilloscope.
Compare what you see in the scope with the wireshark capture
If you don't find the answer, post whatever calls for your attention +
capture files + oscilograms and I will try to help.
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