Re: Tweak Guide from Tweak Gudies!
The following values control the largest size allowed (in pixels) for textures, lighting and render maps. If downsampling is not enabled, these values make no difference. However if downsampling is enabled, changing the limit values can improve performance by restricting the size of texture, light and render maps. The common values are 256 for 64MB graphics cards, 512 for 128MB graphics cards and 1024 for 256MB graphics cards. You can try lower values for your graphics card to see if loading times and in-game pauses are improved, and judge whether your image quality has fallen or not. Typically smaller sample size limits will result in more pixelated textures and less detailed lighting as textures and lightmaps are resized from their original resolutions to smaller ones.
image_downSizeLimit [pixels] - This setting controls the diffuse light map downsample limit - the largest size in pixels for the diffuse light map.
image_downSize [0,1] - If set to 1, this puts into effect the downSizeLimit value specified above.
image_downSizeBumpLimit [pixels] - This setting controls the bump map texture downsample limit.
image_downSizeBump [0,1] - If set to 1, this puts into effect the downSizeBumpLimit value specified above.
image_downSizeSpecularLimit [pixels] - This setting controls the specular lighting light map downsample limit.
image_downSizeSpecular [0,1] - If set to 1, this puts into effect the downSizeSpecularLimit value specified above.