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I found that my Windows machine was using over 95% of RAM constantly and it was often slow. And I found that "Paged Pool" always used over 10GB RAM. Here's 2 screenshots of task manager:
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I followed the instructions in answer https://superuser.com/a/949246/160304 and here's what I found:

  • Use poolmon to sort paged pool usage by bytes, the thing which uses around 12GB(I believe) has tag FMfn:
    enter image description here

  • Find out which driver is using tag FMFn, looks like it's fltMgr.sys:
    enter image description here

  • Find out what fltMgr.sys is, it's from microsoft:
    enter image description here

Now I don't know what to do next. I'd appreciate some ideas.

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  • Can you explain how you came to this discovery in the first place - before you researched and ran these tools? What does the much more familiar ‘task manager’ or ‘resource monitor’ show for memory usage? Specifically in regards to individual processes?
    – Appleoddity
    Oct 31, 2017 at 3:56
  • I updated my question with 2 more screenshots. I hope that's not too many screenshots.
    – SparedWhisle
    Oct 31, 2017 at 3:58
  • It seems you have a hidden process taking a lot of RAM. Try this tool to identify it: docs.microsoft.com/en-us/sysinternals/downloads/rammap
    – Appleoddity
    Oct 31, 2017 at 4:08
  • run the xperf command from my answer and look at the callstack of the FMfn tag. Maybe you also have this WiseFs64.sys usage.
    – magicandre1981
    Oct 31, 2017 at 6:48
  • @magicandre1981 Thank you very much. Yes, I also have Wise folder hider installed. Removing it solved the problem.
    – SparedWhisle
    Oct 31, 2017 at 7:20

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