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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?

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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 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) Aug 23 '17 at 15:10
  • I couldn't find anything helpful, except constant CPU usage by System Idle Process ( 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%. 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.

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