The WindowServer process is what draws the GUI on your screen so it's not Windows from MS but rather a fairly critical part of OSX. That said, it shouldn't be taking up that much CPU. From what I found in other forums, quitting mail and/or Safari and starting them again will often times clear up the high CPU usage of WindowServer. There are also threads around external display-port monitors triggering spikes in WindowServer CPU use.

CB

On 4/30/14, 1:33 PM, Marc wrote:
I have "Windows Server" as the second process listed taking up 30% of my CPU. Does anybody know what this is and can I kill it? I am not running anything Windows on this machine.
Thanks

On Monday, April 28, 2014 1:25:03 PM UTC-7, Chris Blouch wrote:

    Sounds about right. Unix processes don't take much overhead and are
    often coded to 'block' and take no CPU until a particular event
    happens.
    So many of those processes are adding no load to the CPU. Likewise
    unix
    systems like OSX swap out to disk any allocated memory that hasn't
    been
    used for a while when needed. So a blocked unused process will
    eventually be swapped out and will only create enough of a
    footprint to
    keep track of it in case it needs woken up sometime.

    CB

    On 4/26/14, 12:03 PM, Traci Duncan wrote:
    > I can only answer one of your questions.  :)
    >
    > I just took a look and I have 149 processes going.
    >
    > Traci
    >
    > On Apr 25, 2014, at 9:00 AM, Jim Gatteys <jgat...@gmail.com
    <javascript:>> wrote:
    >
    >> Hi all!
    >> I thought my computer was running a bit slow so took a look at
    Activity Monitor under Utilities.  It says I have 158 processes
    going.  Is that about normal for you all?  Is there a list of most
    common processes to see if I need all of them or if I can kill
    some of the processes?
    >> I don't remember that many going under Windows but it has been
    a while so perhaps I have forgotten.
    >> Thanks,
    >> Jim
    >>
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