Windows 10 - Poor Performance and 100% Disk Usage

Discussion in 'Windows Guest OS Discussion' started by danfratamico, Oct 31, 2016.

  1. danfratamico

    danfratamico Bit Poster

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    I have a 27" iMac Late 2015 running macOs Sierra and PD 12.0.2. My iMac has the 1TB fusion drive with the 24GB SSD. After fresh installing Windows 10, it ran fine. Started to slow down after updates were installed. Sometimes, the VM runs extremely fast, but most of the time my disk usage in Windows is pegged at 100%. I have checked my settings in PD and it seems to be fine. I'm not really sure what is causing my high disk usage, especially when Windows is just idling, not running any programs, and not installing updates. Also, when the disk usage is at 100%, I can hear my Mac hard drive ticking away and is loud. First Aid found no issues with my disk. What can I check?
     
  2. IT_2

    IT_2 Bit Poster

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    I guess you have set the VM to run with expanding disk.
    What other specs does the VM have?
     
  3. danfratamico

    danfratamico Bit Poster

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    Hmm, that is a new one. It is set to expanding disk, but I can't fathom why that would slow me down so much? I'm not really expanding that much and most of the time my disk usage is 100% when I am idling on the desktop doing nothing.
     
  4. Hello DanielF1, please try this steps and check if that makes any changes.
     
  5. danfratamico

    danfratamico Bit Poster

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    Yes, I tried these steps in the past and it did not help. I am having high disk usage issues, not high CPU.
     
  6. Maria@Parallels

    Maria@Parallels Parallels Team

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    So, this KB may help you with the CPU usage. Please try and check .
     
  7. danfratamico

    danfratamico Bit Poster

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    Everything is setup correctly for my VM. Again, though, I am not having high CPU usage, I am having high disk usage.
     
  8. PaulChris@Parallels

    PaulChris@Parallels Parallels Support

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    Dear DanilF1, please check out this article to identifying what takes disk space on a Mac.
     
  9. KaiH2

    KaiH2 Bit Poster

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    Hello PaulChris!

    Sorry for just jumping in here but you guys that are supposed to be Parallels tech support are not listening to what the customer is saying, he has NOT a problem with the CPU, he has NOT a problem with low on disk space, he has a problem where the disk is utilized 100% of the time without any reason that takes down the system performance. Why do I jump into this question, because I have exactly the same problem... The disk is 100% in activity without any real reason. What is going on? This problem has come up when I upgraded to Parallels 12.
     
  10. danfratamico

    danfratamico Bit Poster

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    Did you ever solve your issue? Mine is still prevalent...
     
  11. KaiH2

    KaiH2 Bit Poster

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    Well, actually not! I found out that the reason for my disk utilization was because poor SD driver in the guest OS. It was not possible to install that kind of driver that best worked with my hardware as the drivers Windows 10 supported was to new for my hardware and vice verse. Eventually I found one SD driver that made things a bit better but after every parallels tool update, I needed to reinstall that driver. That just drove me crazy so I decided to get a new PowerBook with better hardware and a SSD big enough so I didn't need to use the SD expansion. Now everything rolls on as expected. So, check if you can change the chipset drivers to see if they cope better with you hardware.
     
  12. danfratamico

    danfratamico Bit Poster

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    Glad you fixed your issue! I think my issue is related to my iMac 5K's Fusion drive. It's a 1TB drive and I have the model with the measly 24GB SSD portion. I'm thinking when macOS shifts my VM from the SSD to HDD, it slows down. What's strange is that sometimes my VM is extremely fast, maybe for about 2-3 minutes, then it gets slow.
     
  13. RogerH6

    RogerH6 Bit Poster

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    There is a common problem in W10, with high disk usage (not a Parallels problem). There are about five things that can cause this, but one is the drive optimisation that Windows does. I found that this in particular causes problems with the 'virtual' HD in Parallels, repeatedly seeing it as needing optimisation, and moving lots of data around pointlessly.
    Have a look at:
    <http://www.drivethelife.com/windows-10/how-to-fix-100-disk-usage-after-windows-10-upgrade.html>
    Turning off Superfetch also helped my system a lot.
     
    danfratamico likes this.
  14. danfratamico

    danfratamico Bit Poster

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    Thanks Roger. Do you also notice that your performance is very sporadic? Right now, I have my Windows 10 VM running and it is lightning fast. Visual Studio opens in 2 seconds and everything is running smooth. Guaranteed if I wait about 30 min, my disk usage will increase. I did disable Superfetch and it didn't seem to help that much. What I really need is a tool like Process Monitor to see exactly which process is causing the high disk usage.
     
  15. danfratamico

    danfratamico Bit Poster

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    UPDATE: I disabled the "Superfetch" and "Connected User Experiences and Telemetry" services and the issue seems to have gone away. My boots are much quicker and after booting, my system isn't pegged at 100% disk anymore. I do experience somewhat high disk usage upon booting, but that is because I linked my Microsoft account and it's doing all the syncing and OneDrive nonsense.
     
  16. RogerH6

    RogerH6 Bit Poster

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    Cross fingers. :)
     

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