CIGs causing massive framrate hit

[JFJohnny5]

I like CIGs. But whenever they start hitting targets...my framerate drops. If I just fire them off into space and they explode at the end of their range, it's fine. But if they hit a target, the explosions cause some serious chugging.

TC runs quite well otherwise. 1920x1200x32 with textures at Medium, shaders at High. And AA is 4x while AF is 8x. My Radeon 4870 has little trouble with most of the game. But these CIGs baffle me. Any tips for fixing the problem?

[Carlo the Curious]

Just the usual:
- make sure your drivers are up to date
- and DirectX
- and Windows
- clean up your codecs
- supply the information requested for tech support help.