Instead of using extreme compression that ruins the game, you can follow an official performance guide to tweak settings for low-end hardware . GTA V Graphics Settings and Mods to Boost Your FPS
Environments are rendered in very low definition, resembling games from the early 90s . Is it actually playable? gta-5-game-on-pc-highly-compressed-gameboy
If you are looking for a "highly compressed" version to download on a low-end PC, be extremely careful. Instead of using extreme compression that ruins the