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The heap on windows is single threaded causing it to lag behind linux in performance in allocation heavy multithreaded scenarios, BVH building is a prime example. See https://developer.blender.org/D6218 for benchmark results for testing with the allocator enabled/disabled you can set the environment variable TBB_MALLOC_DISABLE_REPLACEMENT=1 to disable the TBB allocator. Reviewed By: @sergey Differential Revision: https://developer.blender.org/D6218