Why does my game struggle on first load of a level area.

Unity Engine
1

I find my game performs (FPS drop/lag) really bad on first pass of a section of the level but then when I drive away and return to the same spot it performs fine.

Is it caching information that it uses later?

Why does it struggle on initial load of sections?

2

As far as i understand, you load sections of levels additively. It may be related to shader compilation. Try using Shader.WarmupAllShaders when you load your level(on the loading screen basically)