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Task Manager shows CPU usage constantly at 100%, but Process Explorer shows CPU usage at about 5%. I've tried the solution presented in CPU Constantly at 100% In Task Manager, But Not in Process Explorer, but it did not work for me. When I reboot the PC into Safe Mode, though, everything is OK.

How can I resolve the discrepancy?

Ben N
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Cato
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  • What about Task Manager’s Detail view? Does it (roughly) add up to 100% usage? You might want to sort by CPU usage to check it. – Daniel B Aug 22 '17 at 18:12
  • I think it does, however the usage change very dynamicaly. For example: dwm.exe (44%), taskmgr.exe (30%), csrss.exe (10%), chrome.exe (10%) and system interruptions (6%) and in the next second taskmgr.exe (or other process) jumps to 80% and other processes are in lower usage. – Cato Aug 23 '17 at 15:03
  • use [WPRUI/WPA](https://superuser.com/a/1164299/174557) to analyze the cpu usage of the proceseses. for 3rd party tools like chrome, add the debug symbols from the 3rd party tools ([chrome debug symbol server](https://www.chromium.org/developers/how-tos/debugging-on-windows)) – magicandre1981 Aug 23 '17 at 15:10
  • I couldn't find anything helpful, except constant CPU usage by System Idle Process ( https://imgur.com/a/uudgO ). I look up properties of this process in Process Explorer and threads tab shows: ntoskrnl.exe!KeSynchronizeExecution+0x2160 on every core – Cato Aug 23 '17 at 19:13
  • the WPA shows that the cpu is 94% idle, this is fine. so active cpu usage is 6%. – magicandre1981 Aug 24 '17 at 15:45

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Try chasing the guilty process(es) in the Resource Monitor (type "resmon" in the Start Menu).

I had the same problem and the faulty app what not visible in the Task Manager, even in Administrator mode, no idea why.

Manur
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