5 votessamho commented
Similar experience coming from .. Surface Pro 4 i7 version as well.
My experience is after using this app for a while (include carrying SP4 around with type cover closed), Plumbago's response, especially the pen stroke can be unbearable.
Sometimes, restart the Plumbago could resolve the situation to some degree, but reboot the whole device (SP4) will almost certainly restore the responsibility of plumbago, which make me wonder it could be system-wide issue instead of App issue? Well, that's just my guess.