I discovered that both scrolling and Youtube-playback (HTML5) works just fine in Chromium, both in Ubuntu 16.10 and Mint 18.1 (which is built on 16.04). So perhaps this is a Firefox bug?
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1650381 Title: Slow scrolling in Firefox and slow Youtube-playback with Radeon RV730 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1650381/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs