The blog of Windows Wally, a Windows Support Technician helping common people solve frustrating computer problems.

Troubleshooting svchost.exe using 99% CPU in Windows 8

Reader Question:
“Hi Wally, After I start Windows 8 it starts to use a lot of processor and my computer’s fans start too. The problem seems to be the svchost.exe process. It seems like a system process so I think it can’t be closed either. What should I do?”   - Nicholas K., USA

Before addressing any computer issue, I always recommend scanning and repairing any underlying problems affecting your PC health and performance:

  • Step 1 : Download PC Repair & Optimizer Tool (WinThruster for Win 10, 8, 7, Vista, XP and 2000 – Microsoft Gold Certified).
  • Step 2 : Click “Start Scan” to find Windows registry issues that could be causing PC problems.
  • Step 3 : Click “Repair All” to fix all issues.

Setting up weekly (or daily) automatic scans will help prevent system problems and keep your PC running fast and trouble-free.

Wally’s Answer: This problem used to show up in Windows 7 and some older versions of Windows but some people have had problems with the svchost.exe process in Windows 8 as well. The svchost.exe process starts taking a lot of processing power and overloads the computer, slowing down everything else.

svchost.exe - cover -- Windows Wally

Its not that difficult to fix though, and it shouldn’t take too much time either.

What is svchost.exe?

The svchost.exe process hosts Windows services. Sometimes you might see more than one of these running in the Task Manager. It is part of the WIndows operating system, an diit is not a trojan or virus. So, don’t worry, its really supposed to be there.


The svchost.exe is taking too much processing power.


The svchost.exe process in Details tab of the Task Manager, or Service Host (No Impersonation) in the Processes tab of the Task Manager has the uPNP service which causes high CPU usage because its continuously waiting for compatible devices.


The solution to this problem is easy. All you need to do is disable the uPnP device source service and see if that fixes your problem. You can disable the uPnP service by following these steps:

  1. Use the keyboard key combination WindowsKey+R to open the RUN dialog box.
  2. Type services.msc and Press Enter
  3. Find UPnP Device Host > right-click it > click Stop
    svchost.exe - services.msc - UPnP Device Host - Stop -- Windows Wally
  4. Now look in the task manager again, the CPU usage should have come back to normal.

I Hope You Liked This Blog Article! If You Need Additional Support on This Issue Then Please Don’t Hesitate To Contact Me On Facebook.

Is Your PC Healthy?

I always recommend to my readers to regularly use a trusted registry cleaner and optimizer such as WinThruster or CCleaner. Many problems that you encounter can be attributed to a corrupt and bloated registry.

Happy Computing! :)

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About the Author

Windows Wally is a helpful guy. It’s just in his nature. It’s why he started a blog in the first place. He heard over and over how hard it was to find simple, plain-English solutions to Windows troubleshooting problems on the Internet. Enter: Windows Wally. Ask away, and he will answer.