which is the best anti virus for a server

While the management side of McAfee may be great the client side scanning engine is a massive resource hog. Having done tests with a particular piece of work the completion rate with McAffee enabled was twice as long. Utterly unacceptable. Even with on-demand scanning turned off the overhead was still bad. Frequent cases of multi-second lock-ups while doing things (which when typing a line of text can be very distracting). Its not like I have a slow machine (2 * Xeon with 4 cores each). Overall the running cost for this AV is just too high as it impacts productivity too much.
Long time since I used Sophos, but it didn't cause any issues like this when I did.

What version were you testing and what OS? I've never seen this and we've been using McAfee for ages now!
 
What version were you testing and what OS? I've never seen this and we've been using McAfee for ages now!

XP Pro SP3, Dell T7400, McAffee VirusScan Enterprise 8.7i

TBH I think McAffee is only half the problem as these machines 'should' be a lot faster than they are, having said that disabling McAffee did appear to be a big win in speeding it up. I don't think XP can really use the multi-processor multi-core machine efficiently. Since I'm compiling a large project it will access thousands of files to do its job, maybe the on-demand scanning is killing it. Sadly, as is usual in a large corporate environment, I have no control of how the AV is configured really.
 
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