Router lag

[Faheria_LAT3]

Deek:
Bah, I never know which forum to post this in, but anyways. Just recently I got a router for my cable modem because I have to share it with my siblings, and things arn't doing to well. I'm not gonna explain because that's not the reason i'm posting here .
But anyways, when I get on Graal, I lag horribly. I mean like nothing moves at all, and even if a couple of people do move, they move realllllllllllly slow. I know this has to be my router, cuz if I unplug it and play Graal again, it runs just fine. And whats strange, my router seems to make my internet go faster o_O. Anybody know what the problem is? I've tried everything