I had almost the exact issue described in this bug (the only exception being that in my case the internal keyboard was slow no matter what), and it was completely fixed after the macOS 10.12.4 update.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1572739 Title: Mac UEFI boot 24x slower keyboard/touchpad troubled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572739/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
