Rather than downloading a pre-made file from potentially unsafe sites, it is safer and more effective to create your own tailored version:

To optimize your Grand Theft Auto V experience, you don’t necessarily need a "download" in the traditional sense; instead, you can create and customize a simple file to force specific hardware and software settings.

Depending on your hardware, you might want to use these common parameters found in the Official Rockstar Games Support list :

This small text file, placed directly in your game’s root directory, acts as a powerful tool to fix lag, bypass certain hardware restrictions, and force graphics settings that the in-game menu might otherwise block. How to Create Your Own commandline.txt

: Navigate to your GTA V installation directory.

: Right-click in an empty space, select New > Text Document , and name it exactly commandline.txt .

: [Drive Letter]:\Program Files\Rockstar Games\GTA V .

: Open the file and type one command per line. Save : Save the document and launch your game. Essential Commands for Performance and Fixes