Aside from running out to replace your video card, CPU, and system memory, there are a few simple game settings you can tweak to improve overall performance. The system settings page and the advanced settings page both have several video quality options that players can adjust to heighten their game experiences.
Doom 3 offers four quality levels: Low Quality, Medium Quality, High Quality, and Ultra Quality.
Doom 3 Quality Settings
(Frames Per Second - Higher Is Better)
Ultra Quality: According to id's Robert Duffy, the Ultra Quality setting requires a 512MB graphics card to run without a hitch since this setting uses uncompressed data that can take up a lot of memory space. Shuffling all this data around can cause some slowdown.
High Quality: The High Quality mode is recommended for 128 to 256MB graphics cards. This setting compresses specular and diffuse maps but not normal maps. Going back to Duffy, High Quality "looks very, very close to Ultra Quality, but the compression does cause some loss."
Medium Quality: This setting uses compression for specular, diffuse, and normal maps.
Doom 3 Quality Settings
(Frames Per Second - Higher Is Better)
Low Quality: This setting is meant for those poor souls who only have 64MB video cards in their systems. It basically represents Medium Quality but with downsized textures. Textures larger than 512x512 are resized to better fit into the graphics card's limited frame buffer.
Doom 3 has an automatic video quality setup feature that scans your hardware and sets the "optimal" resolution and video quality setting. For the most part, this feature works well, but the optimal settings can be somewhat conservative. You might be able to get away with increasing the resolution or video quality settings to one notch above the tool's optimal recommendations.
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