hi
just wanted to add something here..why don't you try other network services other than Streamyx? I'm using Izzi and it's kinda fast on most of my XBL games (except GTA4) , but it's a hassle to make it work with my X360 (i'm a bit of a noob in setting up network addresses etc).

I'm curious to know if anybody here uses UMobile/Maxis/Celcom to play XBL..kindly share your experiences?