Hello Fgunno,
This problem is still here.
I think it has something to to with encrypted php files with Zend and Commercial modules, because older PBX systems <= FreePBX 2.11 did not have this problem if they where not activated.
I know for sure, that all the default installed VPSs have this problem. High Cpu spikes on servers with more than 15 pcs FreePBX Distro VPSs. All at 60seconds (whole minute).
It is a bug, but only for hosting providers which Host multiple FreePBX VPSs