Android 6.0.1 Marshmallow update is already in development for the Galaxy S6, S6 edge, and S6 edge+. The update is already reaching to beta testers out there and we can shed some new information on the upcoming firmware. Apparently Samsung will be limiting the speed of scrolling inside apps and menus for smoother performance. This has been used by Apple for quite some time to avoid lag or visual artefacts, and now it seems Samsung will be doing the same thing to optimize the performance. As per the video below, the scrolling indeed seems smoother though it now takes more time to scroll to the bottom of a page or app. Hopefully, TouchWiz fans won't be disappointed, as this will spare them some annoying lag otherwise noticeable on their top dogs. Keep in mind the update is still in beta, and things may change until it goes...
Source: http://www.gsmarena.com/android_601_for_the_galaxy_s6_series_limits_scrolling_speed_makes_it_smoother-news-16018.php