If you've ever tried to render tens of thousands of objects in Unity — trees, rocks, enemies, particles — you know the pain. My scene had 100,000 simple mesh instances and was running at 38ms per frame (26 FPS). After switching to GPU indirect rendering, I got it down to 0.4ms . That's a 95x speedup. Here's exactly how it works. The Problem: CPU Bottleneck Unity's default rendering pipeline sends one draw call per object (or per batch). Even with GPU instancing enabled, the CPU still has to prepare transform data and issue commands for each object. At 100k objects, that's brutal. The frame breakdown looked like this: CPU : 35ms (preparing transforms, issuing draw calls) GPU : 3ms (actually drawing) The GPU was sitting idle most of the time. All the cost was on the CPU. The Solution: DrawMeshInstancedIndirect Graphics.DrawMeshInstancedIndirect lets you tell the GPU "draw N instances of this mesh" — and the GPU figures out the rest from a buffer you've already uploaded. The CPU just issues a single command.…