Research Optimizations

Research various optimizations that we could possibly add to the game like:
- [ ] Render culling for things outside of camera

The issue only identifies render culling for objects outside the camera and names no files, tests, or entry points. Start by locating the game's rendering and camera systems, then document which optimization candidates are feasible and how they would be evaluated. Done means a concrete, actionable research summary rather than an implemented change.

Written by the indexing model from the issue text.