July 15, 201114 yr I have done a commandline.txt, made by different commands made by different people, I mixed it all together and made a brand new commandline.txt! If you want it, press here. That fixed my lag/stutter completely, I recommend it to everyone, if it doesn't help, unlucky... I did it and it worked. HOW TO INSTALL Download it. Put it in your MAIN GTA IV folder. If it worked, have a glass of cola and enjoy your lag free IV. (Note: If your computer is real bad, or atleast can't make the IV, this MAY fix it, this is not guaranteed, but it will reduce lag a little!) My specs: AMD Athlon II X2 P340 AMD Radeon HD 6650M 750 GB HDD 4GB DDR3 Memmory. Windows 7 Home Premium, 64 bit Laptop So this it it.