Okay then, here I go:

Mostly, games lags for no real reason, which ruins the gameplay completely.
Results are kicking for lag producing, no fun, loosing because you can't see your enemys until it's too late, etc.

Now I found a little solution in the depths of the WWW:

cFosSpeed

It is a little tool which automatically reconfigures your Computer's TCP-Settings.

I have tried it with Gang Garrison:
From unplayable* to nearly lag-free!**

*Yes, I tested it on multiple days multiple times before, all resulted with total lagging.

**This is the scenario at my PC with the current version of GG2. Results may vary depending of connection, hardware and game/application.

there are no magic tools

It's not a "magic tool" it just reconfigures a bunch of settings to decrease latency.

True!
And maybe I'll try it again with my laptop and Pj64k.
I want to play MK64 online without 10fps timing difference!
It is like waiting for Keyboard input and a whole second later, your emulator does the action you want.
Result: Driving against walls, using items too late, falling down pits, loosing everytime...

The reason GG2 was lagging is because you're in ****ing Germany, and the closer you are to where the server is being hosted, the less lag.

Also, would have been nice if you had posted a link to wherever you got this from.