One possible solution to performance issues with Doom3 BFG
I bought D3BFG today, and was immediately stunned at the shear drop in performance on my PC. 2.2Ghz AMD Phenom Quadcore, and running ATI Radeon HD4550. I had previously ran Doom3 original and had no problem running this at all. But this version was very choppy.
So I decided to find out what was going on. Another thread mentions that you must at least get into the game at least once before your default.cfg file is created in the DOOM 3 BFG Edition folder.
If you do get that far, edit the file and scroll right down to the end of the file:
Add the following line:
and save the file.
This appeared to completely resolve the choppiness although I have still got some small issues with particles generated from explosions or smoke trails from the Skulls in Resurrection of Evil. Still looking into other settings to see what's causing the lag with these entities.
Any feedback welcome.