The C-Ray ray-tracing performance was close between all three distributions with no winner.
Ubuntu 10.04 Alpha 2 and our Fedora 13 snapshot both performed better than Ubuntu 9.10 at running the 7-Zip compression speed test. At this point in the Lucid Lynx development cycle it is producing approximately 15% more MIPS than under the Karmic Koala with the same hardware.
Ubuntu 10.04 Alpha 2 and Fedora 13 are also outperforming Ubuntu 9.10 when it comes to the x264 video encoding performance. The advantage here for Ubuntu 10.04 was +18%. Fedora 13 2010-01-13 wasn't quite as fast as Ubuntu 10.04 Alpha 2, but it's nothing to fret about considering the debugging options and that Fedora 13 hasn't even reached an alpha state yet.