This mod gives 14-20 fps boost, no real image quality loss. IT IS WORKING 100% WITH OUT LAGS. You can never get FPS greater than 80 due to the engines limitations. Also getting Game Booster (handy program) might help increasing the FPS by a ~10 more. Set textures, Shadows & reflections to Very High, turn down detail distance and car density to its lowest setting, night shadows off, if you have a car pack, make sure to remove traffic loader (taxis>overheating CPU) also turn off VSync, enable definition (removes CPU-heavy vaseline filter and motion blur).
For all users:
Game Booster - It disables unnecessary programs that run on your computer while you are playing a game, you can easily renable all the programs once you finish playing your game. So its safe and easy to use.
Contig - Its a defgramentation program that does single folders, so its very handy for optimizing quickly only what you want.
Instructions for Contig:
- Copy contig.exe to game dir (where your game files are located), now create a new text document in the same folder and write this inside
contig -v -s %CD% pause
Rename it to start_contig.cmd and Doubleclick it, let it finish loading. Thats all.
Windows 7 and Vista users:
Those operating systems will deliberately park some of your cores which will decrease FPS substantially in CPU eating games like GTA IV.
In my GTX570SLI setting I had about 110 FPS ingame onscreen. After changing to GTX680 I was really disappointed as I had meager 60 to 70 FPS. Now that I changed registry settings after reboot I get instantly about 100 FPS ingame (depending on the scene).
How To Disable CPU Core Parking For Multi-Core Processors
So if You don't like to mess with registry here's a simple tool:
Disable CPU Core Parking Utility