AutoexecGame2.con exactly. But we don't have this one and you need to create it. Go to your game folder and create the 'Parameters' folder, then make a 'AutoexecGame2.con' file and write this inside:

Engine.TShadows 0
Engine.Shadows 0
Engine.UseStencilShadows 0
Engine.TrueWaterRef 1
Engine.WaterReflections 1
Engine.DisableCloth 0
Engine.DSystemActive 0
Engine.GFadeFar 1200
Engine.GFadeNear 600
Engine.Farplane 2400
Engine.AlphaFadeNear 2000
Engine.AlphaFadeFar 2200
Engine.LOD0 1800
Engine.LOD1 2400

This way your game will work quickly, but this guide not created to some of us. I know that lot of gamers already have a top hardware, and they need the graphical challenge. This game probably can't give it to them, but let me give you few useful comands. The value is written with a space after the command name. A value of 1 means incl., 0 - off, in some cases using other parameters.

Display.Show On/Off statistics display (default 0).

Display.FPS On/Off FPS display (default: 0).

ShowInterface Show/Hide the full interface (default is 1).

GameRate The flow rate of the game time.

Engine.AutoDOF On/Off postfilter DOF (Depth of Field), (default: 0). After switching On the background is slightly blurred, as in Gothic 3, but it will have to pay a decrease FPS.

Engine.AutoDOFTolerance Setting range of Depth of Field beginning, the possible values ​​of 0.1 to 1.0 (default is 0.4). DOF will only work with working HDR in game.

Engine.FOV Write angle 2 times lower than desired. For example if you need to 180°, place a value of 90.

Engine.GFadeFar Distance of poor quality grass drawing. The value must be higher than the Engine.GFadeNear parameter.

Engine.GFadeNear Distance of grass quality drawing. Possible values ​​- from 0. o graphics card limit.

Engine.Farplane The total drawing range (value above makes game beautiful). Possible values ​​- from 500 (below doesn't make sense) to graphics card limit.

Engine.AlphaFadeFar Drawing distance of nice-resolution landscape texture. The higher number - better graphics of far landscape. The value of this parameter must be highter than Engine.AlphaFadeNear.

Engine.AlphaFadeNear Landscape high-resolution textures drawing distance. The higher value - the better graphics. Possible values ​​- from 300 (below doesn't make sense) to graphics card limit, but this value should be lower than Engine.Farplane, otherwise they will be lost terrain texture.

Engine.LOD0 The level of near area detail, value above - better graphics.

Engine.LOD1 The level of far terrain detail, value above - better graphics. This value should be higher than Engine.LOD0, otherwise the trees will disappear foliage.

Particles.SetMaxParticlesOnScene
Particles.SetMaxParticlesOnSceneHigh
Particles.SetMaxParticlesOnSceneLow These three parameters control the particle system. Possible values ​​- from 0 to graphics card limit.

Engine.UseDynamicLighting On/Off dynamic lighting (default is 1).

Engine.UseVIS On/Off vertical sync.

Engine.DrawReflectedObjects By disabling this option, you remove the effect of light reflection from some objects (default is 1).

Engine.TreeWindFactor When ption turned off, the trees will not sway on wind.

Engine.GrassRandomizer This parameter affects the quality of grass (default is 1).

Engine.GrassDisp This parameter affects the grass location, when disconnecting will be place grass "on the grid", which is unnatural (default is 1).

interface.Camera.RotateUnderDialogSpeed Parameter controls the speed of the camera in dialogue scenes. 0 - the camera is stationary.

Also you can change this parameters during the game, just write them in game console.