Michael Larabel of Phoronix performed several benchmark tests between the latest FreeBSD (note that it is not the official 11.0-RELEASE), Ubuntu, and macOS Sierra operating systems on the MacBook Air. The tests performed range from SQLite, OpenMP, to the LLVM Clang compiler. See the link below for the detailed results.
Yesterday I published some macOS 10.2 vs. Ubuntu 16.04 LTS benchmarks from a Mac Mini and MacBook Air systems. For those curious if BSDs can outperform macOS Sierra on Apple hardware, I tested the MacBook Air with FreeBSD 11.0 compared to the Linux and macOS results on that Core i5 system. Here are those results.
FreeBSD 11.0 AMD64 was tested on the Haswell-based MacBook Air and it actually worked well. Even the HD Graphics 5000 were playing nicely with the FreeBSD DRM Intel driver. The MacBook Air is equipped with a Core i5 4250U CPU with HD Graphics 5000, 4GB of DDR3 memory, and a 120GB Apple SSD. The install was smooth and was off to the races with testing.
Read about the benchmark results: http://www.phoronix.com/scan.php?item=freebsd-ubuntu-sierra&num=1&page=article