Spring RTS Engine

While playing NOTA, certain unit's effects will dramatically slow down the game's FPS from 32 to about 9. So far I have noticed that aircraft thrusters (but not transoprts...), and the Roachbomb's cloaking field cause this slowdown. Is there any way to subdue these effects? What is strange is that none of the other effects (many of which are much more complex) cause any slowdown whatsoever.

turn off lua shaders in springsettings, should fix it