More than a few users know about shift-F10 during WinPE, to open CMD and run commands like FDISK, copy drivers and other files around.
I forgot you can run CMD while Windows install is running, after the first reboot. Curious why your install is slow? Run taskmgr, or resmon and see if your setup is doing absolutely nothing, or just hitting the system really hard. Resmon will report what files are being touched, which is much easier to read than digging around DISM, CBS, or WindowsUpdate logs.
I forgot you can run CMD while Windows install is running, after the first reboot. Curious why your install is slow? Run taskmgr, or resmon and see if your setup is doing absolutely nothing, or just hitting the system really hard. Resmon will report what files are being touched, which is much easier to read than digging around DISM, CBS, or WindowsUpdate logs.