Are external harddrives slow?

im looking into buying a $300 western digital 1TB external harddrive. now lets say i got like, world of warcraft on there. full installed. i wanna play it. will it be really slow, since its not laoding it off of a regular hard drive inside the computer? are some faster than others? what are the pros and cons when... show more im looking into buying a $300 western digital 1TB external harddrive. now lets say i got like, world of warcraft on there. full installed. i wanna play it. will it be really slow, since its not laoding it off of a regular hard drive inside the computer? are some faster than others? what are the pros and cons when buy one? what should i look for. because all i really need is just a lot of room b/c all i have is 30gb left on my one and only internal WD hard drive. anyway, the only thing i could really think that would bother me would be if i was booting up warcraft or something and it was extrememly slow or something. if not, cool. thx guys.
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