Whenever you're just watching other jobs, and don't want to get in the way, like with
systat or whatever, it's always nice to use
nice watch squeue -u myUserName
That runs your process at a reduced priority (compared to the default priority level). Assuming that the cluster jobs are running at normal priority,
nice-ing your process tells the scheduler that you are willing to accept only whatever spare CPU time is left over after all the jobs above you have gotten their CPU time.
If you're doing low-priority stuff at all on a heavily-loaded machine, it's always considerate to:
$ nice bash -l
so that everything you do runs at a lower priority than the "real jobs" the cluster is already running.