If you're lucky, the child processes are going to core dump every 10 seconds and start up again to dump again later.
If you're one of the unlucky ones, as I am, the Apache processes are going to take (cumulatively) 100% of your CPU time.
Trust me on this one. If you are thinking of running Apache on FreeBSD or thinking of upgrading, don't bother. Give it a year or so to develop and stick to the 1.x branch.