Grand Theft Auto V\mods\update\update.rpf\common\data\

Modders began "hacking" this file to expand these limits, allowing for 300+ addon cars and massive map mods.

Drastically raises the limit on how many extra RPF files (mods) the game can read.

If you are having trouble, I can help you find a specifically configured version of the gameconfig file if you tell me what kind of mods you are using (e.g., lots of cars, map mods, or traffic mods).

(e.g., maximum car capacity vs. performance)