COM Surrogate Process and High CPU Usage

Just an observation on Windows 8 that I wanted to share which may also help others using Windows Vista and 7.

Recently, I was seeing some graphical glitches occur under Windows 8 as well as CPU usage getting stuck at 25% for unusually long periods of time on my quad-core i7 desktop. This meant that one core was being consumed persistently for no apparent reason. Obviously, this isn’t a good thing particularly with power conservation coming more into focus these days. The offending process was noted as COM Surrogate which maps to dllhost.exe in Windows.

In order to unstick the process I would reboot my computer which would temporarily resolve the problem but it would eventually come back.

I thought that perhaps the video drivers might be causing a problem so I rolled back from the official nVidia drivers to the standard drivers included with Windows 8 and restarted the system. Having done that a couple of days ago things have been working fine ever since with no further video glitches or processes chewing up the CPU for no reason.


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  1. This may have been some coincidence. If it is indeed COM surrogate, it might have been better if you had looked for DLLs running in that process before rolling back from the NVidia drivers.

    • tsecheng on November 28, 2012 at 23:36
    • Reply

    In windows 8, this is home group problem, disable “home group”, COM surrogate hightly use CUP well solve.

      • Johnny4B on December 4, 2012 at 21:39
      • Reply

      Hi tscecheng

      Every forum I have been on could not help me, came across your advice and solved issue straight away

      Thanks a million


    • EddieW on March 5, 2013 at 13:13
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    I installed Windows 8 and was also getting the high CPU usage by COM Surrogate. I traced mine down to the little checkbox under the View tab of Folder Options. Place a check mark in the very first entry under Files and Folders which says “Always show icons, never thumbnails”. Click on OK, then reboot. No more thumbnail icons on my Desktop, but no more high CPU usage by COM Surrogate, either. I can live with that.

    1. Quite interesting – definitely something else for others to check if they happen to encounter the same situation.

    • Yoganand on March 14, 2013 at 04:01
    • Reply

    High cpu usage by COM surrogate it’s increasing gradually.

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