I have an Xbox 360 connecting directly to a router which then links onto a broadband modem of a 4mbp/s connection, although this may not apply to my issue but from my understanding networking accounts for this problem. My xbox 360 has never had any problems running slowly, but I'm offline, not signed into xbox live and everything runs perfectly as in I can flick through each slide (games, media, system etc.) fine, it doesnt run slowly for example pressing the 'Xbox' button on the controller will open smoothly. But I sign in to xbox live and it takes ages for the friends list to load showing everyone offline, sometimes it doesn't sign in to xbox live so I do it manually, basically everything runs incredibly slowly compared to yesterday. This problem hasn't built up or gradually happened, yesterday was fine, today extremley slow!. I ran an Network Diag. Test and it failed on Xbox Live meaning there was a problem with xbox live, next time I tried running the Net test everything was fine, everything shows up connected, confirmed and open for NAT. Any Help appreciated, British_Command.