Speed up Windows Preinstallation Environment (WinPE) boot time by cleaning up the image after adding drivers, languages, or packages.
Mount the Windows PE boot image
Dism /Mount-Image /ImageFile:"C:\WinPE_amd64\media\sources\boot.wim" /index:1 /MountDir:"C:\WinPE_amd64\mount"
However, don't unmount the image just yet.
Prepare to clean the image
This process marks files that can be removed during the export process.
DISM /Cleanup-Image /Image="C:\WinPE_amd64\mount" /StartComponentCleanup /ResetBase
Unmount the image
Commit the changes and unmount the WinPE image:
Dism /Unmount-Image /MountDir:"C:\WinPE_amd64\mount" /Commit
Export and then replace the image
The exported image should be smaller than the old image. Replace the original image with the new one.
Dism /Export-Image /SourceImageFile:"c:\winpe_amd64\media\sources\boot.wim" /SourceIndex:1 /DestinationImageFile:"c:\winpe_amd64\mount\boot2.wim" Del "C:\WinPE_amd64\media\sources\boot.wim" Copy "C:\WinPE_amd64\mount\boot2.wim" "c:\winpe_amd64\media\sources\boot.wim"
Try it out
Create bootable media, such as a USB flash drive.
MakeWinPEMedia /UFD C:\WinPE_amd64 F:
Boot the media. WinPE starts automatically. After the WinPE window appears, the wpeinit command runs automatically. This may take a few minutes. Verify your customizations.