I use High:
/console farclip 1250
/console groundEffectDensity 36
/console groundEffectDistance 240
/console environmentDetail 30
/console particleDensity 50
/console shadowMode 0
/console waterDetail 0
/console reflectionMode 0
/console sunShafts 0
/console basemip 1
/console terrainMipLevel 1
/console projectedTextures 0
/console weatherDensity 0
/console componentTextureLevel 1
/console textureFilteringMode 1
/console Sound_EnableAllSound 0

And Low:
/console farclip 250
/console groundEffectDensity 0
/console groundEffectDistance 0
/console environmentDetail 0
/console particleDensity 10
/console shadowMode 0
/console waterDetail 0
/console reflectionMode 0
/console sunShafts 0
/console basemip 1
/console terrainMipLevel 1
/console projectedTextures 0
/console weatherDensity 0
/console componentTextureLevel 0
/console textureFilteringMode 0
/console Sound_EnableAllSound 0