Optimize Sprite rendering with static batching. Even thousands of sprites on-screen is no problem!
Static Sprites is a lightweight tool to optimize the rendering of non-moving sprites. The improved performance means you can now render thousands of sprites on even low-end mobile devices without a hitch!
As a technical background, Unity normally dynamically batches the rendering of sprites as an optimization. Dynamic batching means it groups the geometry into similar renderable batches each frame, and this generally works pretty well for small moving geometry. However, dynamic batching is not optimal for non-moving sprites, since the CPU still does a lot of work constructing the batches each frame. If you open the Unity Profiler or Frame Stats, you can check the Dynamic Batching batched draw calls count. That is all the redundant work, since the sprites don’t move.
Details: https://assetstore.unity.com/packages/tools/sprite-management/static-sprites-271347