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  1.    05 Aug 2016 #1
    Join Date : Jan 2015
    Seattle, WA
    Posts : 44
    Windows 10 Pro

    Anniversary Update: Windows 10 CPU usage 100% All the time


    I'm having an on-going issue with CPU usage and Windows 10.

    I did a clean install with bootable media for Anniversary, and after I did that CPU rates went back to normal. But after I reinstalled my programs, it shot right back up to 100% CPU usage constantly.

    If anyone figures this out it would be a godsend because it's been plaguing me for years now.

    Here is a screenshot of literally nothing active running on my PC:

    Click image for larger version. 

Name:	PYwMIrZ.png 
Views:	2 
Size:	54.1 KB 
ID:	94271

    Any idea what it might be? I'm thinking it's a driver issue, but why would it only kick in a day later?

    Appreciate any help I can get here....
      My ComputerSystem Spec
  2.    05 Aug 2016 #2
    Join Date : Jan 2015
    UK, Midlands
    Posts : 10,462
    Win 10 Pro (1703)

    Hi, could you possibly click the CPU tab so the processes using most CPU time are at the top, assuming it's a visible process? That way we can see what's happening. Thanks!

    And does this change if you do a clean boot?

    Meanwhile feel free to search the forum for
    high CPU
    100% CPU
    etc to see if there's anything relevant
    as there's plenty of discussion on such topics.
      My ComputerSystem Spec
  3.    05 Aug 2016 #3
    Join Date : Jan 2015
    Seattle, WA
    Posts : 44
    Windows 10 Pro
    Thread Starter

    Hey dalchina,

    Thanks, I really have been searching, again, for years for the solution (happened with 8.1 also). I've looked all over and tried every trick I've found, but nothing's worked...

    Here's the new view you requested:

    Click image for larger version. 

Name:	fYO8LSU.png 
Views:	2 
Size:	56.1 KB 
ID:	94274

    In terms of clean boot, I want to say it still does it but I haven't tried since post-anniversary update. I can try later today.
      My ComputerSystem Spec
  4.    05 Aug 2016 #4
    Join Date : Jan 2015
    UK, Midlands
    Posts : 10,462
    Win 10 Pro (1703)

    Hi, ok, better start by disabling search indexing and Windows Defender - which, assuming it hasn't changed, will re-enable itself after a while unless you take special action. Also close Paint (which I'd expect, like Cortana, to be 0% assuming it's meant to be idle).

    Then repost the task man screenshot.

    The clean boot result will be interesting, as you mention this only happens after you've installed some programs.

    If after a clean boot, CPU use is still high, then also check and advise result in safe mode.

    Noting Cortana's unusual CPU usage (does Cortana function normally?) can you also post a screenshot showing Cortana displayed (Windows key + S) (will need to be a Prt Sc full screen one). Thanks.
      My ComputerSystem Spec
  5.    05 Aug 2016 #5
    Join Date : Jan 2015
    Seattle, WA
    Posts : 44
    Windows 10 Pro
    Thread Starter

    So I disabled Defender and search indexing completely.

    I did a clean boot minus TeamViewer because I have to use it to access my PC for now.

    Click image for larger version. 

Name:	cpu usage clean boot no index.png 
Views:	1 
Size:	54.7 KB 
ID:	94294

    Click image for larger version. 

Name:	cortana screen.png 
Views:	113 
Size:	16.7 KB 
ID:	94295

    Cortana is acting normally.

    Edit: here are a list of the details by CPU usage with Chrome open.

    Click image for larger version. 

Name:	details chrome.png 
Views:	2 
Size:	74.3 KB 
ID:	94296
    Last edited by davidvkimball; 05 Aug 2016 at 11:34. Reason: details
      My ComputerSystem Spec
  6.    05 Aug 2016 #6
    Join Date : Jan 2015
    UK, Midlands
    Posts : 10,462
    Win 10 Pro (1703)

    Ok, now Cortana use is almost 0, and looks ok which is encouraging.

    Note you still have Defender running (topmost result). I had this problem when I very first installed Win 10 on an older laptop. Note it is using CPU and disk heavily.

    It would also be disabled if you install another AV program, but note that I've read recently about MS allowing Defender to be run alongside another AV...(!).

    Suggest you have a look at this.
    How to disable Windows Defender in Windows 10 permanently - gHacks Tech News
      My ComputerSystem Spec
  7.    05 Aug 2016 #7
    Join Date : Jan 2015
    Seattle, WA
    Posts : 44
    Windows 10 Pro
    Thread Starter

    Alright, I disabled Defender via Group Policy:

    Click image for larger version. 

Name:	arg.png 
Views:	2 
Size:	74.5 KB 
ID:	94301

    I'm convinced this is some virus MalwareBytes/Defender can't find that's causing the CPU usage issue.

    I'm going to try resetting my PC again this weekend and installing programs one by one and see if I can identify the cause.
      My ComputerSystem Spec
  8.    05 Aug 2016 #8
    Join Date : Jul 2016
    Posts : 164
    Pro x64 Desktop v1607 14393.51, Home x64 Laptop v1607 14393.51

    I don't want to interfere here because dalchina is doing well; however, when I looked at your first screenshot, I noticed that just displaying task manager was using a whopping 44% of your CPU. With that said, I have to ask "Is your CPU somehow throttled down and/or does it run at full speed when needed?" Check your task manager performance tab for visible issues and your BIOS for CPU stepping options if necessary.
      My ComputerSystem Spec
  9.    05 Aug 2016 #9
    Join Date : Oct 2014
    Trnava
    Posts : 2,750
    Windows 10.4 Home 1709 x64

    Add this process to the exclusion list in Windows Defender: C:\Program Files\Windows Defender\MsMpEng.exe
      My ComputerSystem Spec
  10.    05 Aug 2016 #10
    Join Date : Jan 2015
    Seattle, WA
    Posts : 44
    Windows 10 Pro
    Thread Starter

    Hey aardvark,

    I've tried to disable Turboboost/overclocking options in my Bios. That may be another issue, do you think updating my BIOS could potentially fix the issue?

    And TairikuOkami, are you suggesting I should reenable Defender and then add that process as an exclusion?
      My ComputerSystem Spec

 
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