What could cause those peaks in the profiler!? 90% of the scene is static batched.
Seems the spikes are related to garbage collection. The memory panel shows a steady rise in allocations then it gets flushed, the clearing of the allocations will strain the CPU. Your GUI is allocating 18KB per frame in that screenshot. That might be a good place to start. No idea what is going on in your scene, but if you’re creating and destroying lots of objects, that will cause more frequent garbage collections.