Without knowing how it works, it is difficult to draw conclusions.
You are assuming that the commands are sent instantly, and any buffering is happening on the shield. You are also assuming that the log file entry is written at the time the command is sent.
If the buffering happens on the server side, and messages are logged only after receiving a "command complete" message from the shield, then it could be a speed problem after all. But in that case, they could flush the buffer as soon as you release the button.
Continuing that thought, perhaps the way they flush the butter is to process every buffered command, but not send it to the shield. This could result in entries appearing in the log file even if no command is sent.
Tell me what you are doing, and what to look for. (I am not sure how to make sure things are actually being logged, or how to view them.) I'll try it on my setup and let you know if I see anything different.
I did originally think that the commands were possibly being buffered by the Shield, but after I watched the myServer log last night that doesn't appear to be the case. You make a good point about myServer maybe only adding an entry to the log once it receives an acknowledgement from the Shield, but I have no way of determining that and since the behavior is the same when sending an IR command I assume it simply posts entries to the log as it issues commands in real time. I could be wrong but to me logically if it was otherwise the server would log a TX command sent and an RX response received for debugging purposes.
What I did was open the myServer Live Event log and just watched what was happening while I pressed a direction button. On IP it starts sending the same command repeatedly, at the rate of maybe a little more than once per second. Once I let go of the button I see the command still being sent repeatedly for a variable amount of time, and this varies based on how long I had the button pressed for. When I switch to IR commands I see the same behavior, but now the command is being sent at a rate of about 3 times each second.
I just checked my AppleTV and it does the same thing with that device as well. I did not check my bluray player or PS5 but I suspect this will be the case with those devices as well.
If I do the same thing with the volume controls (which is linked to my Denon) it does the same thing looping the volume up/down command, with the difference being that as soon as I release the volume button the commands stop being sent immediately.
