I was playing around with some teambinds. All binds were working. Except "I'm attacking.", which I bound to Numpad9.
And now look, what happened on this one.
Gameplay was sped up and laggy at the same time. With laggy I mean, that I couldn't move correctly. It was a little like in my old 56k days. On Speed.
It seems like this effect is caused by the Numpad8 and Numpad9 keys only. Dunno what the binds are called officially in Nex, since this new Mac-Keyboard doesn't have a PageUp and stuff writing on its Numpad.
I'm using Nexuiz 2.4.2, the full package. I deleted my old folder and even my old config before applying the new version. Can't say, if this would happen on old versions too, since I was too lazy to find out about teambinds until they got into the menu with 2.4.2.