What connection speed are you paying for?
go to speedtest.net and start it to see what you are dl/ul rates are. If they are within 20% of what you are paying for. If they are not as fast as you are supposed to be getting, it's time warner. If these are normal but you are having issues downloading things, you are probably being throttled by time warner (they like to slow down programs like bit torrent). Either way, time warner is more than likely screwing you.
I used to have time warner and my speeds went from 15Mbps down to 0.25Mbps. I called them on it and they said my router must be bad...so I bought a new router and didn't fix anything. So, I called again and had a tech come out to see what was wrong. Turns out that 200 people had moved into my neighborhood and they couldn't handle the bandwidth. It made playing MMOs impossible!