Sorry for the confusion, i was using a pi2, about a year ago when i went from a pi1 to that pi2 i experienced a great improvement in performance.
During that time i was working on a lua script (lighting) that wasnt working as expected:
viewtopic.php?f=23&t=5072
In short the issue was the devicechanged script should have been triggered but it didnt when the devichanges happened simultaneously. When i went to 2.2284 and a rpi v2 the behavior was as expected.
Can't tell if switching to multiple cores or the different domoticz version resolved that.
Anyway, now on the quadcore (AMD A8-6500T), not a superfast machine, the newest versions are running a-ok, the machine isnt busy:

- serverddlin2load.png (91.46 KiB) Viewed 536 times
Those spikes at ~25% are tvHeadend recording the news etc, the other 2 spikes at 100% is where i compiled domoticz (make -j4).
Btw i see now you have accounted for the number of cores, when i look at (h)top the maximum cpu load is 100% times the number of cores, nice work!