Michael Larabel of Phoronix does some benchmarking on the latest versions of various BSD and Linux distributions with his Phoronix Test Suite. The tests range from Fhourstones, LZMA compression, to combile bench. For a full report, head on over to their page at the link below.
All eight Linux/BSD operating systems were benchmarked on the same system. The hardware used for this comparison was the 36-thread Intel Core i9 7980XE running at its stock speeds and with Hyper Threading enabled, ASUS PRIME X299-A motherboard, 4 x 4GB DDR4-3200 memory, NVIDIA GeForce GTX TITAN X graphics card (though no graphics tests in this article), and a 240GB Corsair Force MP510 NVMe SSD.