GTA IV on PC has a hidden configuration file. Create a blank text file in the root folder called commandline.txt . Add these lines to fix performance on modern GPUs:
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When Rockstar Games released Grand Theft Auto IV in 2008, it was a technical marvel—a sprawling, gritty narrative set in a living, breathing Liberty City. However, it was also infamous for its horrendous PC port. For over a decade, players have wrestled with erratic frame rates, a bizarre memory leak disguised as "VRAM limits," and Games for Windows Live (GFWL) DRM that rendered the game nearly unplayable. GTA IV on PC has a hidden configuration file