What's the top (3?) fps killers in vanilla FC?

[Laer]

I've got the fps helper mod and all that, but I'm just curious which graphic/audio settings are the worst fps killers. I have my resolution down fairly low, and heat effects off (from day one)... but I'm still looking for ways to improve the framerate. Generally, it plays quite nicely (with a few hicups now and then).... Really, the only time it's kind of painful is with the SU-25T tv monitor on.

 

I was surprised the fps helper mod puts the heat effect on... so, I'm wondering if any other features/settings are turned on/increased by it that I would normally have lower.

 

16bit colour is fine, right? I know 32 was overkill (or something) previously...