We think the cause of the issue is that the USB flash drive you used is too slow or you have inserted the USB drive into a very slow USB port. For a Windows operating system boot drive, the 4K random read/write speeds are very important. Usually the 4K read/write speeds of the common flash drives are always slow, so these drives are not suitable for creating portable Windows.
We highly recommend using a Windows To Go Certified Drives or an external hard drive to create Windows To Go. For Non-certified USB flash drive, we recommend you to buy a Corsair Flash Voyager GTX Flash Drive, SanDisk Extreme CZ80 USB 3.0 Flash Drive or a SanDisk Extreme PRO CZ88 USB 3.0 Flash Drive, we've done a lot of testing, they're fast enough to run Windows smoothly and more cheaper. If you want small size and high performance, Corsair Flash Voyager GTX Flash Drive is the best choice.
Thanks.
We highly recommend using a Windows To Go Certified Drives or an external hard drive to create Windows To Go. For Non-certified USB flash drive, we recommend you to buy a Corsair Flash Voyager GTX Flash Drive, SanDisk Extreme CZ80 USB 3.0 Flash Drive or a SanDisk Extreme PRO CZ88 USB 3.0 Flash Drive, we've done a lot of testing, they're fast enough to run Windows smoothly and more cheaper. If you want small size and high performance, Corsair Flash Voyager GTX Flash Drive is the best choice.
Thanks.