Theory #3: The Deja Vu Theory

Have you every had one of those days when the day goes by like nothing, or the day just keeps dragging on? I'll explain this by using human heartbeat as my units. Every human's heartbeat is a different rate. What if internally every person's heart beats at a different speed all the time. Basically, the time between beats is different every time your heart beats. This partially explains why the flash can go so fast. Maybe he can regulate this heartbeat whenever he wants.