On a busy system (e.g., run make in background) try selecting a process. The process table keeps changing before you've a chance to do anything. The suggesiton is to, if the user is interacting with the window in some way (scroll, clicking, searching, ...), hold off refreshes for a bit (a bit being some number of seconds). That way the user sees a stable view. If the user leaves things alone then the refresh again resumes.