In matches, it is critical to adjust your in-between-point-speed based on several factors.  If you have lost several consecutive points, take your time before serving or receiving.  If you are feeling fatigued near the end of the match, take your time.  If you are unsure of the proper strategy to use next, take your time.  If you feel in control of the match and physically feel good, then it is a great strategy to play fast between points and finish the match asap.