Yes high CPU is expected from this bug, since the normal vsync throttling is just falling through. So the nested server and any of its clients that use async swaps (which means server-side vsync used by Xmir) will also render unthrottled hogging the CPU.
Although we've still got a lot to optimize after this bug is fixed... https://bugs.launchpad.net/ubuntu/+source/unity8/+bugs?field.tag=performance ** Changed in: mir Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1661072 Title: mir 0.26 - spinner loading animation, minimize, maximize too fast To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1661072/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs