How to boost your Doom3 performance by 40% on ATI hardware

http://www.sunflower.com/~kyleb/humusd3atitweak.zip

You can also use that file, just extract it to your Doom 3 directory. (The one with the pak4 files.) This is the edited file. It works because Doom 3 uncompresses the file during gameplay, but it won't overwrite a file. If this doesn't help, or makes things worse, just delete the file from your Doom 3 folder and you'll be fine. :p
 
Here is supposedly a refined version of the tweak:

Old Code:
# perform the diffuse bump mapping

#-----------------
TEX light, fragment.texcoord[0], texture[0], CUBE;
MAD light, light, scaleTwo, subOne;

# instead of using the normalization cube map, normalize with math
#DP3 light, fragment.texcoord[0],fragment.texcoord[0];
#RSQ light, light.x;
#MUL light, light.x, fragment.texcoord[0];
#-----------------
Click to expand...

New Code:
# perform the diffuse bump mapping
#-----------------
#TEX light, fragment.texcoord[0], texture[0], CUBE;
#MAD light, light, scaleTwo, subOne;

# instead of using the normalization cube map, normalize with math
DP3 light, fragment.texcoord[0],fragment.texcoord[0];
RSQ light, light.x;
MUL light, light.x, fragment.texcoord[0];
#-----------------
Click to expand...
 
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