High CPU Utilization Bug on Windows 10 RTM

I’ve been running the Windows 10 Enterprise RTM build, using Native VHD Boot, on my Dell Latitude E6430 ever since it came out on July 29th. Since then, I have mostly had a good experience with it, however there have been some setbacks. The largest setback that I’ve noticed is that my laptop consumes significant amounts of CPU cycles, for apparently no reason; the system is mostly idle, from a user perspective. From what I can remember, this problem has mostly occurred after sleep / resume of the system.

Using the free tool from Sysinternals called Process Explorer, I investigated the processes that were chewing up CPU cycles consistently.

Windows 10 :: Microsoft Edge :: High CPU

Windows 10 :: Microsoft Edge :: High CPU

The Microsoft Edge Browser has a DLL loaded called iertutil.dll, and the browser seems to be consuming a lot of CPU cycles on the EGetTabWindowExports function.

The worst offender (using 15% CPU consistently) is a service called the Data Sharing Service (dssvc), which loads itself using the svchost.exe process. This process is spinning cycles on the EtwEventRegister function in the ntdll.dll library. I tried to use PowerShell to stop the service, but it is completely hung. The only option I know of to temporarily resolve this is to kill the process that hosts the Data Sharing Service. It seems that the problem stems from the Event Tracing for Windows (ETW) subsystem, because I noticed some other processes that were chewing up CPU cycles on the same function.

Windows 10 :: High CPU (svchost)

I’m hoping that Microsoft can resolve these bugs, as they are reducing performance of my laptop, causing the fan to run at high speeds, and most importantly, killing my battery life.

  • LondonDBA

    Exactly the same issue with Windows 10 on my desktop. CPU constantly running at 10-15% for the Edge browser making calls to EGetTabWindowExports. Fan constantly running. Really hope that Microsoft know about this and fix it soon.

    • Thanks for confirming! Personally, I’m not worried about the fan running, but the real impact it’s having is that this is killing my battery life.

  • Courtney

    Hi! I realize this post is a couple of months old at this point, but I upgraded to Windows 10 and have been having the same issue, and yours was pretty much the only post about it that I’ve been able to find. Have you happened to find out any more about this or figured out how to stop it?

    For me, it’s the same EtwEventRegister function in ntdll.dll in explorer.exe, constantly using 12% CPU and pegging my CPU at 3.9GHz even with all other programs closed. As soon as I kill that thread, CPU usage drops back to 3% and 800MHz when idle. Still seems to come back every once in a while, though…

  • sammakko

    I have the same problem, I found out the following:
    I have a folder with 6 large Zip files (1.8-2gb) in the same folder I have sub folders.
    If I now open that folder and navigate to the sub folder and than to any other folder my Explorer.exe uses 98% CPU.
    Moving the zips to a other subfolder and don’t open that folder, the problem disapear for me.

    So please check if you also have large (or any) zips in a folder where you open a subfolder befor the CPU usage start to happen.