j. patrick lanigan

$ nice -n <priority> emerge kde

....where priority is in the range -20 to 19, -20 being highest and 19
being lowest.

That being said, I am not so sure how this will help. This just means
that the process will "get out of the way" of procs with higher
priority. If nothing else is using up CPU cycles, this doesn't change
anything AFAIK. I am going to give it a try though next time I have a
painfull emerge on my very hot running laptop.

You might also look at the man pages for make.conf and emerge, as I
believe you can set the 'niceness' in make.conf.

HTH,
-Patrick

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