It should be no surprise that decreasing the tutorial from 6 pages to 2 will increase number of users "registered" from 40% to 80% (or more). In my experience,

It should be no surprise that decreasing the tutorial from 6 pages to 2 will increase number of users "registered" from 40% to 80% (or more). In my experience, tutorial dropoff follows a power law, that is, every new hurdle you place before the user can use your app gives them one more chance to bail. You can try all the fancy design tricks you want, but the end result is still the same...you're creating friction points. In reality there's a delicate balance. Train users to use your app early and take the hit in registrations. You should end up with more engaged users who retain better. Or let everyone in and teach them as they use your app and risk retaining them because they don't understand what the hell they're doing. There is no silver bullet.