CRM 4.0 and McAfee Virus Scanner

I was out with a customer recently and he asked me to look at why their CRM server was running so slowly. After running performance monitor on their server and looking at counters for Memory, CPU, SQL, IIS, CRM Async I couldn’t see any of them taking a hit. This was a 8 processor server with 16GB of RAM but opening a contact or account took 4 to 5 seconds.

As soon as I disabled the McAfee “On Access Scanner” opening a contact or account came down to 1 second. Microsoft support have acknowledged this as a known issue.