You can configure cron job with priority. This can be set from nice command before the executable ,
==-
*/5 * * * * nice -15 <Cron Job>
-=--=
This will run the particular cron job with highest priority.
Done
==-
*/5 * * * * nice -15 <Cron Job>
-=--=
This will run the particular cron job with highest priority.
Done