Limit CPU and other resources while port build

Building my ports on a 500mhz sparc processor takes A LOT of time, and will usually unbearably slow down my webserver while the new builds takes place. Is there any way to tell the make command to give itself a low priority so that it doesn't interrupt the other operations on the server?
 
Nice has no noticeable effect on FreeBSD. As far as I understand from past mailing list discussions about scheduling, the schedulers don't give it a lot of credit.

What you can do is impose limits in your login.conf. But maybe that should be done in a jail. I do not know the consequences of imposing such limits on the root user.
 
nice works!

Running 'nice +20 make buildworld' did have a noticeable afect on my last update from 7.1 to 7.2.the server was slower, but much better than without it.
 
Limiting CPU utility

I used to limit CPU resources on Linux boxes with cpulimit utility.
I wonder if there is something similar to it for BSDs..
 
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