A gameconfig is a critical XML file that defines many core parameters and limits within Grand Theft Auto V. It acts as a configuration file that controls various technical aspects of the game, and is essential for modding. The game's default configuration has relatively low limits for various elements. As noted by a source on Gameconfig for addon cars, "if you try to add something with the default the game is going to crash, but with a custom gameconfig like my gameconfig the game will work good".
: Allocates more total system RAM to the game engine. 108771 gameconfig 2021