Optimisation help

[DRedshot]

I'm having massive fps problems on my first map. It could just be down to the fact that my laptop is terrible, but I think there is more to it than that. I have tried placing black planes behind all the walls to occlude everything behind them, but I thougt the engine would do that anyways :/

The map is 3mb in size, and I know that is a lot for a single map, but the majority of this is due to decals.

Any suggestions on how to get a fps improvement without having to remove the decals, which imo are very important in keeping the repeating patterns on the textures hidden

Cheers