In one of my ECS systems, I provide a NativeArray of components for a job. This native array job field is marked [DeallocateOnJobCompletion] [ReadOnly] If I don't access this array inside a job, the fps is alright. If I iterate over it(simple "for" loop) and try to access every element, Entity Debugger shows that EndSimulationEntityCommandBuffer eats around 30-40ms. This system doesn't even explicitly use any EntityCommandBuffer! What can cause this behavior?