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Sorry, didn't got it. You said the Pi1 was to slow for your task, which also seemed to be confirmed by your values: 99%+6%=95% CPU usage, which is way too close to 100%. This indicates that the PI is throwing all its idle time to ServerNode which is still not enough.

The Pi2 on the other hand seem to be fast enough with its multiple cores, it is using 125% = 1,25 CPU cores to handle the node.

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