While FreeBSD 9.1 has yet to be officially released, the FreeBSD-based PC-BSD 9.1 "Isotope" release has already been made available this month. In this article are performance benchmarks comparing the 64-bit release of PC-BSD 9.1 against DragonFlyBSD 3.0.3, Oracle Solaris Express 11.1, CentOS 6.3, Ubuntu 12.10, and a development snapshot of Ubuntu 13.04.
Unfortunately in this article are not benchmarks of PC-BSD/FreeBSD 9.0 or 8.2 because the high-end Intel system being used for this cross-OS benchmarking had encountered problems when booting the earlier installer media due to FreeBSD kernel problems. A PC-BSD/FreeBSD comparison of the different releases will come at a later date.
The same Intel Core i7 3960X "Extreme Edition" system was used throughout the benchmarking process of PC-BSD/FreeBSD, DragonFlyBSD, Solaris Express, CentOS, and Ubuntu Linux. The stock settings were used on each of the platforms and the 64-bit images were used of each operating system.