My understanding is that the kernels are mostly equal. I’d be pretty surprised if one had a large impact one way or the other. Any differences I’d chalk up to the userspace program running it.

Don’t forget there are serious hardware differences. It’s not apples to apples.

But that’s ok. The author isn’t claiming FreeBSD is way better than Linux. It’s just a comparison of what he had vs what he has now.

Show me those benchmarks