So you get FiOS connected to your cable box outside your house, then its converted to copper wire and sent to your router for your "fastest" possible internet. not really. you just converted to slower copper cable. Most likely this is what happened if you have FiOS installed to your home.
It's like you put a DUI Checkpoint in the middle of the highway. Its not gonna make a difference if there's not that much traffic, but it will definitely slow you down.
so why not just use fiber wire?