Hi List, just tested merlin for about 4 days. The check latency rises from 0.2s to 2.3s while merlin is running. http://www.pnp4nagios.org/merlin_latency.png Is this a known behavior? I will update to merlin 0.5 soon. The used Version is a git snapshot from 12.06.09 Nagios 3.0.6 Debian Lenny 280 Hosts 3400 Services Cheers, Joerg