Useful tweaks For GTA4

1. Go to C:\Program Files\Rockstar Games\Grand Theft Auto IV.
2. Create a text file called "commandline.txt" (no quotes).
3. Just edit and add any of the command lines listed below to the text file.


Graphics

-renderquality: Set the render quality of the game. (0-4)
-shadowdensity: Set the shadow density of the game. (0-16)
-texturequality: Set the texture quality of the game. (0-2)
-viewdistance: Set the view distance of the game (0-99)
-detailquality: Set the detail quality of the game. (0-99)
-novblank: Disable wait for vblank (No Vsync)
-norestrictions: Do not limit graphics settings
-width: Set width of main render window (default is 800)
-height: Set height of main render window (default is 600)
-safemode: Run the graphics in the lowest setting possible
-frameLimit: Limit frame to interval of refresh rate (ex If refreshrate is 60HZ frameLimit 1 = Locks down to 60HZ)
-refreshrate: Set the refresh rate of main render window Warning - Monitor must support (ex. refreshrate 60)
-fullscreen: Force fullscreen mode
-windowed: Force windowed mode
-availablevidmem: Set amount of physical Video Memory(ex. availablevidmem 0.9)
-percentvidmem: Percentage of video memory to make available to GTA


Audio

-fullspecaudio: Force high-end CPU audio footprint
-minspecaudio: Force low-end CPU audio footprint


System

-noprecache: Disable precache of resources
-nomemrestrict: Disable memory restrictions