[Dovecot] load increase after upgrade to 2.0.8

I upgraded most of our servers from 1.2.x to 2.0.8 and am noticing a really big increase in server load. This is across the board, not any specific server. Check this screenshot of a load graph: http://grab.by/7N8V

Is there anything i should be looking at that could cause such a drastic load increase? Conf file is available here: http://wa.ter.net/download/doveconf.txt

Regards,

Cor