we have >10,000 members...

# of members is immaterial, it's all in the activity those members add to your site. If 10% of your registered members post more than once a week you are doing well... <img src="https://www.ubbcentral.com/boards/images/graemlins/smile.gif" alt="" />

An active 150 members could do more damage than a slow group of 20,000 members...

To answer your question, we aren't having cpu problems, tho we have a nice server with scsi hd's and a decent amt of ram.