SNMP queries sometimes have no response. is there a limit to queries per minute on SMG?

Hi,

We have 26 SNMP monitors on our SMG's, CPU, memory, Disk space, Queue info...

When I have about 15 enabled all is fine, but when I enable all 26, it seems to be too much for the SMG to handle. all sensors poll once every minute.

Is there a limit to SNMP requests/minute what the SMG allows? Or is it the fact the CPU is always around 99%

the 99% part is dus to stunnel consuming that much CPU and we planned to upgrade all boxes to the latest version, so if that is the reason why snmp polls encounter no response then that will probably be the solution, but if you guys have any other idea, please share

regards

Jurgen