Unity Game Optimization - Third Edition

Memory requirements

The additional memory requirement for static batching will vary, depending on the amount of replication occurring within the batched meshes. Static batching works by copying the data for all flagged and visible meshes into a single, large mesh data buffer, and passing it into the Rendering Pipeline through a single draw call while ignoring the original mesh. If all of the meshes being statically batched are unique, then this would cost us no additional memory usage compared to rendering the objects normally, as the same amount of memory space is required to store the meshes.

However, since the data is effectively copied, these statically batched duplicates cost us additional memory equal to the number of meshes, multiplied ...