You're probably right, Lars. I find those fastest times unbelievable too, so I take no notice of them. Fuzzy introduced this jigsaw game on another site that I have not long joined. You can change the numbers of pieces if you want to and there is a huge choice of different jigsaws to go at. There seems to be a different picture each day that appears to be automatically chosen so I have put the link on my post (I may put it with my signature as well), then anybody who wants to have a go can click on the link and go from there.
Click on this link for the jigsaw challenge............ there are literally hundreds of different jigsaws to play and also you can choose the size(number of pieces) of your chosen puzzle.