I have some epmp1000 sync in different situations. One with 40 connected sm and some with less than 10 connected sm. In all cases I see a lot of cpu spikes to 100%, it's normal? In all cases a strong sm traffic usage don't coincide with cpu spikes.
Moderate traffic (up to 25 Mbps)
Version 2.6.1 rc1
Not much traffic (up to 6 Mbps)