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With one of the AIX 4.3.3 patch levels the behaviour of one of the performance API's changed. The change can lead to excessive CPU consumption with short intervals. The method used to calculate average values was improved to improve accuracy, but this is much heavier than before.
As a workaround just refrain from using short intervals in the second range.
Marcel Mol has changed the original monitor program at mesa.nl. I have not modified my 3.1 branch. These are licensing problems for me to perform further work on monitor 3.1. Just read the License file coming with recent versions of Marcel's code and you'll understand.