Ubuntu 14.04 LTS vs. Oracle Linux vs. CentOS vs. openSUSE
John The Ripper's Traditional DES performance seems to regress greatly on GCC 4.8 compared to the older compiler in Ubuntu 12.04.4 LTS, Oracle Linux 6.5, and CentoS 6.5.
Compiling the Linux kernel is taking slightly longer on Ubuntu 13.10 and Ubuntu 14.04 LTS.