Does SELinux Slow Down Fedora 15?
SELinux also minimally affected the SQLite database benchmark on the Fedora 15 installation.
Disabling SELinux had resulted in the PostMark mail server test profile yielding 5% higher performance than the stock Fedora 15 settings.
The Threaded I/O Tester with carrying out eight threads of 128MB random writes barely saw any speed difference with SELinux, although the write speeds were already quite slow with the system being clobbered.