The tooltip for changing CPU reporting to percentages references the term jiffies.
When set, report CPU usage in percent instead of jiffies.
For non technical users this is meaningless and could probably be replace with another term or phrase that would be easier for users to understand. In all my time with iX and FreeBSD I dont think Ive ever heard anyone use the term, so its not a term non geeks would have any idea about.
Perhaps something along the lines of:
When set, report CPU usage in percent instead of units of kernel time.