I'm currently at 5.6 million cookies per second. It's tough, but for some reason I can't stop playing it.
Found a good way playing it, though:
Having this playlist here played in the background.
It kinda fits to it in a really strange way...
Well, there is always that cookiepocalypse that will kill everyone with obesity and diabetes, so a dark and doom-impending sounding song fits it all too well.