Why is our network slower when Trend Micro Antivirus and Antispyware was installed on our domain controller?

Ever since we installed this software our system got noticiably slower especially opening client desktop applications and email attachment. Is there a setting we missed to speed up performance? Thanks.
gbaguhinAsked:
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CrownappraisalConnect With a Mentor Commented:
Most likely the performance reduction is due to Trend Micro doing on access scans. Every file you open is being scanned with the antivirus and spyware software. You can change your policies within trend micro not to do E-mail attachment scans and on access scans this should boost your performance back to normal. Do you have any other software protecting your clients from attachments that may be viruses? If not i would leave the e-mail scans on.
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gbaguhinAuthor Commented:
Crownappraisal, thanks for your solution. I will try it and let you know what happens.
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gbaguhinAuthor Commented:
Thanks Crownappraisal. We tested our system and your diagnosis turned out accurate.
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