Near the end and stuck...

I am only a few away from the finish but stuck on a milkshake level. I do two at a time and am actually waiting for the next glass to appear, so I am faster than the game, but still it says I'm not fast enough. It's the actual orders that are slowing me down!!! Any ideas?

I don't know how you did it, I´m not even near the end (maybe at half) and I´m already stucked with the hamburguers, I just can´t do it fast enough. Any sugerences? I got fed up with this game!!