It's also wise to avoid working toward different rewards in the same time frame; doing so will essentially slow down the progress of achieving the main goal. (debtroundup.com)
Also, some of the puzzles required an extra bit of thought and skill, which then slowed down progress in the game. (thevitalounge.net)
It can also lead to multitasking, which slows down progress on the tasks you're trying to complete. (inc.com)