High Disk Usage on Windows 10 & Windows 8.1

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You may notice that if you are running either Windows 8.1 or Windows 10 that your task manager is showing very high disk usage like the screenshot below:

The reason for this is that Windows 8.1 and now Windows 10 automatically manages your machines virtual memory and paging file size by default. This is usually not the best configuration for your machine and all IT experts will agree that the unwritten rule for virtual memory should be as follows:

  • Set Initial size to the amount of RAM you have in your machine
  • Set Maximum size to double the amount of RAM you have in your machine

So, to do this, you should follow the below steps very carefully:

  • Right click on your Start button and select System
  • Click on Advanced system settings
  • Click the Advanced tab
  • Under performance, click on the settings button
  • Click the Advanced tab
  • Under Virtual memory, click the Change button
  • Un-tick the “Automatically manage paging file size for all drives” check box
  • Select your required drive
  • Click on Custom size radio button
  • Set Initial size to the amount of RAM you have in your machine (in MB not GB)
  • Set Maximum size to twice the amount of RAM you have in your machine (in MB not GB)
  • Click on Set
  • Click on OK thrice
  • Restart your system

Something else to look out for is the SuperFetch service. This seems to take up a huge amount of disk usage so you can stop and disable this service and restart your machine.

Making these changes should speed up your computer significantly.


If you have any questions or feedback on this guide, we would love to hear from you if this has helped your machine speed up. Simply leave us a message below using our comments system.

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About A.J. Armstrong

Founder of TechyGeeksHome and Head Editor for over eight years! IT expert in multiple areas for over 20 years. Sharing experience and knowledge whenever possible! Making IT Happen.

View all posts by A.J. Armstrong

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