I want to take a flash drive with a large sw assembly on it over to a friend's house and observe if his computer can manipulate the assembly fast enough to buy that type of computer.  I can either load the file directly from the USB flash drive, which I beliveve would be a much slower open than from a hard disk, or I can copy the files from the flash drive on to his hard disk and load from the hard disk.    If I load from the flash drive it will be slower to load the big file but after it loads will it also perform slower while I spin the model and do other sorts of general file editing?  Yes, it will be slower to write to the flash drive too but I just want to learn whether his computer is worth buying for sw.  

I ask this because this is company files and I probably shouldn't be sharing this on to non company computers.  I do trust my friend, but just as good practice it would be preferred if I didn't actually put the files on his hard drive if I didn't have to, which is why I am asking the question.