In my experience, persistent usb systems are painfully slow depending on the combination of components. Is your usb drive fast enough (usb 2? 3?)? Is your usb port fast enough? Habe you tried different port on the computer? Booting from usb will most likely require the system to be loaded into memory, do you have enough for what you are trying to achieve?
In my experience, persistent usb systems are painfully slow depending on the combination of components. Is your usb drive fast enough (usb 2? 3?)? Is your usb port fast enough? Habe you tried different port on the computer? Booting from usb will most likely require the system to be loaded into memory, do you have enough for what you are trying to achieve?