Ive been using this app to do jigsaw puzzles for over a couple of years and its had its ups and downs.
The last few updates have resulted in extremely slow load times on start up and even during puzzle completion the app will freeze for several seconds before further moves can be made. The latter is most likely to happen after another app interrupts, e.g. calendar reminder, etc.
Oh, and dont forget the daily pop-up requesting an app review.
CdnBookLover about Magic Jigsaw Puzzles-Games HD, v2.8.3