Once you have ascended, you get the ability to generate cookies when the game is closed, based off of your CpS at the time you close the game. This includes any Golden Cookie-based buffs to your CpS
This could easily be exploited (and accidentally, as that's how I found out about it) so that I continue to get way more CpS than I normally would with the game closed. All I have to do is just wait until I've got a buff before closing the game, and bingo, I'm earning way more CpS for the entire duration that my game is closed.
This doesn't seem to be like intended behavior, but I'd gladly take it if it is.