it depends really. obviously you'll get better connection with closer players like in singapore, HK or japan. but so far, i've played with a number of american hosts and the connection was still good.

so far, UKs connection kinda lags a lot.

and i'm connecting my modem to a switch, with 2 other pcs connected as well. sometimes my pcs, and xbox will use the connection simultaneously, but still smooth online play.