CPU multithreading is basically useless.

My TureNAS, CPU multithreading is basically useless. It mostly occupies a single thread, and I often see the single-thread usage rate at 100%. Is there any way to optimize CPU usage and perform multi-core optimization, instead of just occupying one thread.

Probably depends on what you are using.
SMB is apparently single threaded, so it can’t make use of multiple threads.

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