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.

  • 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? Oct 31, 2017 at 3:56
  • I updated my question with 2 more screenshots. I hope that's not too many screenshots. 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 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. Oct 31, 2017 at 6:48
  • @magicandre1981 Thank you very much. Yes, I also have Wise folder hider installed. Removing it solved the problem. Oct 31, 2017 at 7:20


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