YeAhx
Galvanizer
I don't know if its possible on your router but you can try to lower security level (not exactly sure what it does imo, some kind of firewall thing?). This should reduce taxing of CPU if it was contributing to it and unless you are into networks and know you need that kind of security it won't matter.
Edit: forgot to mention, have you tried just running tcp or utp instead of both?
Edit: forgot to mention, have you tried just running tcp or utp instead of both?