Hi


CUZII, multithreaded is not a good idea at the moment.
Performance with Spring / Zero-K is mostly about your CPU / processor, not so much about the graphics chip you have.
Closing any background programs helps ( web browser, Skype, Dropbox, set your antivirus to game mode, etc. ).
Also, Spring 92.0 has been released and once Zero-K updates itself next time, you should see a big speed improvement and your issue may be reduced.
For now, play on smaller maps.
In the long run, for larger games with huge maps, you may need a better CPU.