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bootcamp - windows 10 very slow

Boot Camp / Windows 10 - Very Slow Startup Times and 100% Disk Usage

  • 2013 iMac 27'', 3.5 ghz i7-4771, 32gb RAM, 2 TB Fusion drive - 1tb allocated to BootCamp
  • OSX Catalina



I'm getting extremely long startup times booting into my Windows 10 Boot Camp partition. From when the Windows logo first appears to when the login screen pops up is a few minutes.


Once I can see the desktop, performance will continue to be very slow when opening apps, Explorer windows, even launching the task manager can take up to 1 minute.


Opening the task manager and looking at the Performance tab shows that my Disk 1 usage is slammed at 100%, even though the Process tab shows the highest app disk usage is only around 10%. Disk usage stays at 100% for a long time, sometimes as long as 8-9 minutes.


Eventually the disk calms down and returns to normal,.


Can anyone help please


Thanks!

Windows, Windows 10

Posted on Dec 15, 2019 1:17 PM

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11 replies

Dec 15, 2019 1:33 PM in response to giorus

Your 1TB Bootcamp should be on the slower HDD part of the Fusion drive. It will be relatively slower, but it should still be reasonable.



giorus wrote:


Opening the task manager and looking at the Performance tab shows that my Disk 1 usage is slammed at 100%, even though the Process tab shows the highest app disk usage is only around 10%. Disk usage stays at 100% for a long time, sometimes as long as 8-9 minutes.

Eventually the disk calms down and returns to normal,.

Does the performance become normal, once the disk is 'calm'? Can you check the size of the pagefil.sys in Windows?

Dec 15, 2019 3:34 PM in response to giorus

giorus wrote:

Yes. After a while performance seems normal.

Good.

Pagefile.sys size = 4.75Gb

This is perhaps too small for a 32Gb iMac.

I have an external 500Gb SSD Drive. Am I better off using that as my windows drive instead of the fusion drive?

External Windows is not supported by Bootcamp. It is a pain to use third-party tools to get it working, and it can be unstable.

Dec 15, 2019 4:59 PM in response to giorus

giorus wrote:

>>>This is perhaps too small for a 32Gb iMac.

Could this be due to the fact that I've recently expanded my RAM from 8Gb to 32Gb? Should I increase the size of this file and if yes how ?

See https://docs.microsoft.com/en-us/windows/client-management/determine-appropriate-page-file-size for reference. If you add memory to the system, it is good idea to increase it.


If Old Pagefile (4.75GB) is proportional to Old RAM (8Gb), then new Pagefile (4x4.75) is proportional to new RAM (32Gb). It does not need to be 19GB, but I suggest you double it, run a SMC and NVRAM Reset and test. If necessary, you can increase it further, but making it too large (>32Gb) is not very beneficial either.



Dec 16, 2019 2:18 AM in response to Loner T

I doubled the size of the pagefile.sys to c. 10Gb. I have also done the SMC reset.


Unfortunately I don't notice any improvements. Still ~10 minutes at startup before I can take control of the machine.


A couple of pieces of info:

1) The resource monitor shows that svchost.exe (LocalServiceNetworkRestrited -p) is extremely active on the drive during that time.


2) Task Manager shows two disks: Disk 0 which is 0% active and Disk 1 (C:) which is the one I'm referring to in terms of 100% activity during startup.


Any other suggestions?


Thanks

bootcamp - windows 10 very slow

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