esxi monitoring issues, high cpu load

Hello,

I'm working on setting up esxi monitoring. We have about 20 machines that
we are looking to monitor. I found xymonesxi on sourceforge and got
everything up and running. However, if I add more than a few esxi servers
the cpu spikes on the xymon box. I'm not getting any errors in the esxi or
esx logs.

Has anyone else noticed the high cpu load using this check? Is there
anything I can do to mitigate the issue?

Thanks,
mjr