i must say that Nexiuz 2.4 is the greatest update yet,

but it has has preforms issius, not fps wise, my fps are over 30 with everything at max, so that not it, its that the game "jumps" like if the fps is under 10.

i think its a bottleneck in the communication with the processor... cos this is the behaviur that Enemy territory had before they added support for Render Threading/ Threaded Rendering, wish is in lay man terms SMP...

So if some one could be as kind as compiling a SMP version of Nexuiz x86_64 (SDL) for GNU/Linux

Strongly agree. Also, can someone compile for ssse3 please? I think this would increase fps by at least a factor of 10.

Nah that was just a bug that slipped in.. see http://forums.alientrap.local/viewtopic.php?t=2824 for possible ways to fix this.
And the only multithreading support in Nexuiz is the sound mixing. Besides when playing online it only renders some stuff so there is no need for more multithreading