OK, the issue is not TutorialContent.qml because modifying that makes no difference.
However I now notice my harddisk LED lights up every time the rendering stutters. So you know what that means :) ** Summary changed: - [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds + [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds in unison with disk activity ** Changed in: mir Status: Confirmed => Invalid ** Changed in: canonical-devices-system-image Status: Confirmed => Triaged ** Changed in: qtmir (Ubuntu) Status: Confirmed => Triaged ** Changed in: unity8 (Ubuntu) Status: Confirmed => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1664150 Title: [performance] Unity8 rendering hiccups/stutters exactly every 5 seconds in unison with disk activity To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1664150/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs