Can you post one of your midi macros and describe what you're trying to do with it? There may be a better way to get there than constant triggering.
As an aside, if you're using midi as a trigger, you may find the midi macros here of interest:
As part of the long-press detection, the "Detect" macro (which watches for all midi traffic) is only activated after a specific midi message is received. This gets around the problem of KM having to deal with endless midi data.