Greatly improved scalability. DragonFly BSD 2.13 is now on par with FreeBSD 10 in the PostgreSQL pgbench test on single-socket multi-core systems. The test setup notes and a plot of results are available.
Francois Tigeot has also done some similar testing on a larger 2-socket Intel machine, which shows DragonFly still trails FreeBSD under these circumstances but is enormously improved with respect to the previous release. There's a mailing list post about this one (and here's a direct link to results).