Since the release of DragonFlyBSD 5.2 this past April there have been many improvements to this popular BSD operating system, including on the performance front.
A lot of recent DragonFlyBSD coverage has been around its support/optimizations for Threadripper 2 with lead DragonFlyBSD developer Matthew Dillon being a big fan of these new high-core count CPUs. In this article though tests are being done from an Intel Xeon "Skylake" CPU for looking at the performance work outside of that scope.
Among the work that has landed in DragonFlyBSD 5.3-DEVELOPMENT have been SMP performance improvements, improvements around Spectre/Meltdown, continuing to mature its homegrown HAMMER2 file-system, defaulting to the GCC 8 compiler over the old GCC5 previous default, and countless other tweaks large and small.