We used to have this kind of bug reported all the time. It's quite possible there's a performance regression in Unity.
Please try regular X and report if it's any better. To do that, you need to remove "type=unity" from /etc/lightdm/* and /etc/lightdm/*/*. Then reboot. Same problem now (without Mir) ?
Please also attach more system information by running this command:
apport-collect 1195692
We used to have this kind of bug reported all the time. It's quite possible there's a performance regression in Unity.
Please try regular X and report if it's any better. To do that, you need to remove "type=unity" from /etc/lightdm/* and /etc/lightdm/*/*. Then reboot. Same problem now (without Mir) ?
Please also attach more system information by running this command:
apport-collect 1195692