Memory compression seems to be disabled - should I enable it?

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  1. Posts : 107
    Windows 10 Pro 21H1 (19043) x64
       #1

    Memory compression seems to be disabled - should I enable it?


    Hi,

    I'm currently doing some maintenence on a friends laptop. I've upgraded the RAM and am also going to put an SSD in there which should dramatically improve performance. (It's only a Celeron!)

    Thing is I've noticed that in Task Manager under the Performance tab and Memory, it always says "0MB" compressed. I've never seen it say this on Windows 10 before.

    Is this likely disabled by Windows due to the processor limitations, or has it been disabled some way accidentally?

    Also if possible to enable it, would you recommend doing so? I've boosted the RAM from 6GB to 12 but wondering if it will improve performance if it stops disk activity with paging. I know in theory it should be doing this less with double the RAM but I just don't know if the compressed memory seemingly being off is causing any slowdowns.

    Thanks

    Memory compression seems to be disabled - should I enable it?-20210328_171515.jpg
      My Computers


  2. Posts : 34,917
    Win 10 Pro (1903) (2nd PC is 21H2)
       #2

    Hi, you can check the state of memory compression (enabled or not) thus:
    Memory compression seems to be disabled - should I enable it?-1.png

    Disable-MMAgent -mc
    disables it

    Enable-MMAgent -mc
    enables it

    This
    https://answers.microsoft.com/en-us/...9-048758f998d2

    suggests a possible cause.

    I found what was causing the issue.
    Superfetch as disabled and service was not set to automatic.
      My Computers


  3. Posts : 107
    Windows 10 Pro 21H1 (19043) x64
    Thread Starter
       #3

    @dalchina

    Excellent, just what I was looking for, I'll run that command to check the status of the compression and see what it says.

    Thanks
      My Computers


  4. Posts : 12,421
    Win10 Version 21H2 Pro and Home, Win11 Pro
       #4

    I get the same PS report as dalchina.
    Memory compression seems to be disabled - should I enable it?-image.png
      My Computers


  5. Posts : 1,244
    Windows 10 Pro x64 21H2 (Build: 19044.1415)
       #5

    What is "Compressed memory"? never heard of it, my screenshot says all of the memory currently used is "compressed"

    Memory compression seems to be disabled - should I enable it?-untitled2.png
      My Computer

  6.   My Computers


  7. Posts : 5,181
    Windows 11 Home
       #7

    zebal said:
    What is "Compressed memory"? never heard of it,
    If you have half an hour to waste, this a pretty interesting video. Good for falling asleep.

    Memory Compression in Windows 10 RTM | Seth Juarez | Channel 9
      My Computer


  8. Posts : 1,244
    Windows 10 Pro x64 21H2 (Build: 19044.1415)
       #8

    Wiki quote:
    The footprint of the data being paged is reduced by the compression process; in the first instance, the freed RAM is returned to the available physical memory pool, while the compressed portion is kept in RAM. In the second instance, the compressed data is sent to auxiliary storage but the resulting I/O operation is smaller and therefore takes less time.
    Looks like we get more performance when memory is compressed to "auxiliary" storage (ex. SSD), while compression to physical RAM gives less performance. (for RAM, IMO no performance at all)

    TairikuOkami said:
    If you have half an hour to waste, this a pretty interesting video. Good for falling asleep.

    Memory Compression in Windows 10 RTM | Seth Juarez | Channel 9
    I'll definitely watch this once, tnx!
      My Computer


  9. Posts : 12,421
    Win10 Version 21H2 Pro and Home, Win11 Pro
       #9

    zebal said:
    What is "Compressed memory"? never heard of it, my screenshot says all of the memory currently used is "compressed"

    Memory compression seems to be disabled - should I enable it?-untitled2.png
    The compressed part is in parentheses.
      My Computers


  10. Posts : 1,244
    Windows 10 Pro x64 21H2 (Build: 19044.1415)
       #10

    Berton said:
    The compressed part is in parentheses.
    Ah, that makes so much more sense!

    Because I watched that channel9 video, and when it ended up I could still not understand why all of the memory is compressed since the guy says compression is more aggressive with low memory devices such as mobile phones, tablets etc.

    It makes sense also because for so few compressed memory there really isn't any reason to turn this feature off.
    turning it off would make these pages go to disk directly (instead of into RAM) and also uncompressed which would increase disk usage.

    At least that's my understanding.
      My Computer


 

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