Until recently, I had Comcast for cable internet. I was pretty much happy with the service. Directly to my laptop or through a router, I got good speeds, and bit torrent even went fast (over 400 kbps on hot torrents) despite not bothering with port forwarding. Towards the end of me having Comcast, my uncle (whose computer is also connected to the router) got into bit torrent, too, and that slowed down my torrents a little, but it wasn't bad at all. Just cut my upload speed by about 10kbps, and that was it.
I had to get rid of Comcast. I ended up getting Verizon DSL (Fios isn't available in my area). Connected directly to my laptop via the DSL modem, the speed's fine. Maybe very slightly slower than Comcast, but I'm satisfied. However, when I connect the DSL through the router, the speed drops dramatically.
Web pages take 15-20 seconds to load, youtube videos stutter as they load, bit torrent never goes above 20 kbps, etc. Now I don't mind the torrent speeds too
much, but why is my speed suffering so severely in everything? It's quite dramatic.
The router is a Belkin F5D5230-4. I've already reset it to factory settings to no effect.