So it kicks you when you log on? Or just lags alot and you log off?
-I have the same problem everytime I log in, i get on the server and it lags so bad i cant move or type, but i wait for atleast 2 minutes and no lag, 35 frames and its all smooth.
Are you using your WIFI, not linksys that you see on the wireless connection.
-You must use your WIFI in order to play, so you can get the best gameplay.
If you say its only kraftzone, you may want to talk to koolio about it as most of our players are fine and they can log in with no lag.
-Unless you live on a secluded island with no civilization or outerspace, it should be fine.
To tell you the truth I have no idea why you keep crashing.
Mind providing a crash log? Should be located in your .minecraft.