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Mind you that the real speed, not the advertised max theoretical speed often advertised, will be key for performance of Windows on a USB stick.If you want to seriously use this ability, you want to look for suitable USB sticks. Preferably you want to USB sticks that use SSD quality flash instead of the crap that generally is found on USB sticks. Generally these are 128GB or more sticks with 200MB/s read and 100MB/s write speeds like the Sandisk Extreme Pro, Corsair Flash Voyager GTX, Transcend JetFlash 780/920.
Mind you that the real speed, not the advertised max theoretical speed often advertised, will be key for performance of Windows on a USB stick.
If you want to seriously use this ability, you want to look for suitable USB sticks. Preferably you want to USB sticks that use SSD quality flash instead of the crap that generally is found on USB sticks. Generally these are 128GB or more sticks with 200MB/s read and 100MB/s write speeds like the Sandisk Extreme Pro, Corsair Flash Voyager GTX, Transcend JetFlash 780/920.