From the post it looks like it is optimized for multithreading from the start, so they possibly used the multithreaded version with thread count = 1. When you c

From the post it looks like it is optimized for multithreading from the start, so they possibly used the multithreaded version with thread count = 1. When you care for parallel workloads its not so important if your single-threaded code is the fastest.