make.conf information needed

"Always" is too much. For example, there are ports that can't be compiled with multiple jobs. However, you can set a desired number:
/etc/make.conf
Code:
MAKE_JOBS_NUMBER=4

Ports that can be built with multiple jobs will be, and ports that can't... won't.

As far as the operating system, it's safe to give a -j parameter for buildworld and buildkernel/installkernel (or just kernel), but not good or useful for installworld.
 
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