I haven't seen any reports of a drop in frames anywhere for the wii u version, but for me, When I burn a bunch of stuff together, I get a huge drop of frames.
Also the jingle cutscene lags alot, the cutscene wasn't lagging in the previous house I had the console in. Once out of the cutscene there's very low frames until you do something.
Any clue of what happened here? The cutscene stuff wasn't happening before.
EDIT: And then my Wii u just crashed, couldn't turn power off, the only thing I could do was open the tv remote.