If you physically watch a manager go through a stack of resumes you'll find some amazing things. The volume alone is intimidating. Eventually they will pick up the stack and take them home with the best intentions of reading them. In fact, it usually takes a minimum of five days for them to find time to read them. They often review them in a location and at a time that are less than optimal for concentration.
Managers get angry and give up on the process easily.
Managers seldom realize that they are the No. 1 factor in slowing the speed of hire. Their willingness to postpone resume screening and interviewing can be deadly in a war for talent where the top candidates are all gone within ten days. Most HR departments exacerbate the problem because they don't take a scientific approach to managing and manipulating management's behavior. If you want managers to screen resumes rapidly here is a proven solution. Five is the maximum at any one time.