The best thing to do is set your Wii with a static IP address.
Use OpenDNS for the DNS address as it's been proven to be faster.
Make sure to set your MTU size to "0" which it will defult it to auto.
On your router turn on DMZ and input your Wii IP address.
This will improve your Wii internet connection speed and ping level. If you want to test out the connection go to your.
If you need help on setting this all up. Send me your router info and I can try my best to walk you through it. Same thing will need to be done with your friends Wii.