Roland USB MIDI Digital Piano driver causing slow performance in macOS High Sierra?

Has anyone encoutered issues with the Roland USB Digital Piano MIDI driver with macOS High Sierra?

I was having major performance issues with my MacBook Pro -- kernel_task taking up all the CPU after wake from sleep or a restart, and taking up to half an hour to settle down.

I did a hard disk erase and clean install, and the issue went away. As soon as I reinstalled the Roland USB MIDI driver, the issue came back -- even when nothing was connected to the Mac. Uninstalling fixed the issue.

Roland tells me they haven't heard of this issue before. Has anyone else?