Multiplayer issues

Hi! A friend of mine is experiencing issues with the multiplayer on SketchFighter. Every time he attempts to invite me it says they have excessive latency and it quits to the lobby. How can this be resolved?

What kind of connections are both of you using? Are you playing with a wired? wireless connection? Are you using a router?

I'm using wireless cable internet. I'm not sure if I use a router or not. I don't know what kind of connection he has. My connection is pretty darn good, I think the issue must be at his end.