or If your IV is running really slow and you're using Nvidia Optimus Graphic Card you should do this before you play GTA IV
What is Optimus Card ?
Optimus is the technology released by Nvidia. It feature is make program with low spec requirement like Ms. Word, Mozilla, Chrome, dll. use an Integrated Graphics (Intel) and use Nvidia for the program who has a high spec requirement (Game, Rendering Software). This is resulting the amount of electricity from Battery is spend economicly. Makes the battery lives more longer.
Optimus list :
All of Nvidia Card who has "M" letter on it's back
Ex. : GT520M
So, what's the problem about it ?
Sometimes, some program isn't set automaticly, in this case GTA IV isn't redirected to use Nvidia Graphics automaticly. So we must change the set manually.
So in this thread we are discussed about how to change the presets manually
Nvidia Control Panel (The one and only )
Note : Click the picture to see the original size
Save it and feel the difference
*Note : I found the video tutorial, you can watch it :
*Note2 : You can do this to the other games too