Comment 37 for bug 1669374

I don't think mir has anything to do with this.

For those with NVIDIA hardware, it's possible that something needs to be done better in the NVIDIA drivers so you're welcome to talk to the NVIDIA driver packager about that.

If you want to confirm that it's not distro-specific, you could try another distro. The Fedora development release often gets GNOME beta packages so that the easier non-Ubuntu I would recommend to test GNOME betas.