What is this?

[dirty frank]

I found a folder in my gmod named GPUCache, what does it do?

[Fearagen]

The "GPUCache" folder in Garry's Mod is typically used to store cached data related to your GPU/Graphics Card. This cache can include precompiled shaders and other GPU-specific data that helps improve performance by reducing the need for real-time compilation of shaders during gameplay. It's a common practice in many games to cache certain GPU-related information to optimize rendering and improve overall gameplay experience. Deleting it will result in the game potentially running choppy for at least 5 minutes until the shader cache is rebuilt.

[dirty frank]

thanks for the help about it.