Network lag even running on a local server

[CG Nitro]

I was playing with some friends, they joined through the server browser as normal. 2/3 complained about bad network lag, stuttering. Me and the 1/3 had no lag, my ping (even when hosting) was ranging from 10-30 (how is it not 0/1 being local), the remote players had a ping ranging from 60-110?

We couldn't figure it out and disconnect soon after.

I created a local dedicated server and configured it, started it, then launched Revolution and connected to it through the server browser - for the first 10 seconds or so I noticed the same lag.

How can this be prevented? If I saw the lag as a local player, I can't imagine what it was like as an internet one.

[Destiny]

having same issue
best part is, if i host SS:TSE/SS:TFE port says its open but if I host SS:R port says its closed, doesn't make any sense.

But stuttering is awful, unplayable
#CroTeam daj popravite to, lijepo vas molim!!