Udp?

[Crono]

This isn't really a technical problem or anything but more of a question to everyone incase someone knows...

Does checking "Don't use UDP packages" affect how much you lag? I've always had UDP disabled (checked) since I'm on a network but does this make me lag more?

Can I simply forward ports so I don't have to check this? I see a port in the F3 options with "Use fixed port", is this to make UDP work? The reason I always have UDP disabled is because I can't see most people moving in a level...been like this since 2001 when I shared my connection.

Will I lag less? People on UN say I lag and was just wondering...