The late January build of Ubuntu 9.04 took its first win with 7-Zip compression. The average number of MIPS was much greater on Ubuntu 9.04. In fact, the difference between Ubuntu 8.10 and Ubuntu 9.04 is greater than the difference between OpenSolaris 2008.11 and Ubuntu 8.10.
While Ubuntu 9.04 was the fastest at 7-Zip compression, it lost to Ubuntu 8.10 at Gzip compression by a fifth of a second. OpenSolaris 2008.11 remained in last.
The Jaunty Jackalope returned to first place with GnuPG file encryption where it beat out Ubuntu 8.10 by less than a second, but OpenSolaris 2008.11 had trailed both Linux operating systems by 14 seconds.