After update performance issue with certain PCs

Over the past 2 months there was an update to the Forefront Client that caused a strange issue on some of our machines.  Basically when we update device drivers MsMpEng.exe goes nuts and uses at least 50% to 98% of the CPU for the entire duration of
the driver install/update.  
The immediate result is that some of the larger device driver installs (like video drivers) actually time out because of this.  Using procmon I traced the cause of the delay. It looks like MsMpEng is scanning the setupapi.dev.log file over and over
and over..hundreds..maybe thousands of times.  We noticed that if we turned off logging for the device driver udpate/install and app install logging that this issue disappears.  We've had this level of logging for years and only in the past 2 months
or so has this issue started to pop up.  The setupapi.dev.log file is rather large and so I can see why it's causing a delay if it has to scan the file over and over and over.
We aren't sure what changed.  We used an older image that had an older version of the Forefront client installed and we made sure it didn't update to a newer client version.  That version of forefront had no issue with device drivers timing out. After
updating the client we now have the issue. A change was made recently and we believe the forefront client is behaving differently.  
Any ideas about what could cause this?
Thanks.

Hi,
Thanks for your question.
How did you perform the update of Forefront Client Security, from windows update or manually? In addition, what are the editions of the Forefront Client Security now and before
you updated?
Best regards,
Susie

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    Hardware Information: ℹ️
        iMac (27-inch, Mid 2011) (Technical Specifications)
        iMac - model: iMac12,2
        1 3.4 GHz Intel Core i7 CPU: 4-core
        16 GB RAM Upgradeable
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        Skip System Files: NO
        Mobile backups: OFF
        Auto backup: NO - Auto backup turned off
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             0%    opendirectoryd
             0%    mds
             0%    dpd
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        172 MB    com.apple.IconServicesAgent
        155 MB    Google Chrome
        137 MB    Dock
        113 MB    Google Chrome Helper
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        10.02 GB    Free RAM
        4.36 GB    Active RAM
        1.35 GB    Inactive RAM
        1.44 GB    Wired RAM
        1.24 GB    Page-ins
        0 B    Page-outs
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        16 GB RAM Upgradeable
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                4 GB DDR3 1333 MHz ok
            BANK 0/DIMM1
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            MacintoshHD (disk0s2) / : 250.14 GB (62.97 GB free)
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        HL-DT-STDVDRW  GA32N 
        HGST HDS724040ALE640 disk2 : (4 TB)
            EFI (disk2s1) <not mounted> : 210 MB
            disk2s2 (disk2s2) <not mounted> : 4.00 TB
            Boot OS X (disk2s3) <not mounted> : 134 MB  - one error
        HGST HDS724040ALE640 disk3 : (4 TB)
            EFI (disk3s1) <not mounted> : 210 MB
            disk3s2 (disk3s2) <not mounted> : 4.00 TB
            Boot OS X (disk3s3) <not mounted> : 134 MB
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            Logitech USB-PS/2 Optical Mouse
            Mitsumi Electric Apple Extended USB Keyboard
        Apple Inc. BRCM2046 Hub
            Apple Inc. Bluetooth USB Host Controller
        Apple Inc. FaceTime HD Camera (Built-in)
        Lexar  USB_3_0 Reader 
        Seagate  Expansion Desk 3 TB
            EFI (disk5s1) <not mounted> : 315 MB
            downloads (disk5s2) /Volumes/downloads : 249.18 GB (138.35 GB free)
            BackUpBro (disk5s3) /Volumes/BackUpBro : 2.75 TB (1.03 TB free)
        Apple Computer, Inc. IR Receiver
        Apple Internal Memory Card Reader
    Thunderbolt Information: ℹ️
        Apple Inc. thunderbolt_bus
            G-Technology G-RAID with Thunderbolt
    Configuration files: ℹ️
        /etc/sysctl.conf - Exists
    Gatekeeper: ℹ️
        Mac App Store and identified developers
    Kernel Extensions: ℹ️
            /Applications/Toast 11 Titanium/Spin Doctor.app
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    UPDATE STATEMENT Optimizer Mode=CHOOSE          1          249                    
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    4574,                                        
    4575                                        
    4574                                        
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