One ATV is Much slower than the other.

Thanks to your guys I have jailbroken both of my ATV2s. The only difference is I jailbroke them a few months apart but used the same procedure. As a side note my first jailbroken ATV is my first generation with a usb stick I got off ebay cause I was too afaid to do it myself. Well…One of the ATV2s I jailbroke is much slower than my ATV1 and my new ATV2 I just Jailbroke. Is this a common thing…any advice? Thanks.