I went into the Mii Plaza after I did the update because I noticed I had some coins built up and I somehow managed to have half a dozen puzzle pieces left after E3, and it was taking forever to load the puzzles. Even holding down the R button it was really slow and displaying loading icons for the puzzle images. I don't know if it's due to the update, but I've never seen it do that before. It certainly didn't enhance my user experience.