Pretend people made video games. I know it may sound crazy, but bear with me. Now, these people have to make the game, and 'develop' it, so to speak. Until the game is released, the game isn't finished. Before the game is finished, thigns like technical designations and graphical effects are being 'tweaked' and finished up. This is that time, which is why the game is running slow.
But since people don't make games, maybe it's the magic video game pixies who are doing something wrong.
*sigh*