Hi again I logged all CPU spikes above 250 (at the beginning of the script) and the result shows how randomly these CPU spikes occur. Maybe the pattern would be clearer, if I would have included CPU spikes below 250 as well, but I wanted to have undoubted spikes in the data only. If anyone is interested in the data: https://mega.nz/#!4YM3xTqA!XXsOMYWX4aM2ZMs5QME8S6YubHEUY5nE5wJE9LRpGls