FYI...
MS AV def. performance issues...
Update signature definitions to resolve performance issues in definitions starting with 1.141.2400.0
- https://blogs.technet.com/b/mmpc/arc...edirected=true
27 Dec 2012 - "Some users of Microsoft antimalware products have reported a performance issue with signature definition versions starting with 1.141.2400.0 (12/21/2012 1920 UTC). The current definition files, since 1.141.2639.0 (12/27/2012 0625 UTC), resolve this issue. If you have a signature set in the affected range, please update to the current definition files*."
* http://www.microsoft.com/security/po...tions/adl.aspx