New maps are sluggish

[CuerpoDelSol]

Hello, I'm running a good median system that gets very playable fps @ 1280x768 on maps which are original to the game. However, new maps - specifically night maps - run VERY sluggishly. I'm aware that most BF2 enthusiasts probably have over-muscled machines - but mine with a PM 1.6, 2Gb RAM, and a Radeon 9700, is still quite respectable. The new maps need to be optimized, or the lighting effects that are unique to night maps might need to be tweaked for better performance.

Thanks