I bought a Linksys x3000 last week and it seems to have performance issues. When i stream a video online e.g. iplayer/tvcatchup, using 100-120kbps my ping to the router goes through the roof. This also affects the other machine on the network. Even though it's not using my full LAN speed or even internet speed (8mb adsl connected at 5.7mb) I can't even open the web interface to the router while streaming. I've turned off the firewall and filtering which has helped a bit but it still seems to struggle 
MW


MW