Thanks for sharing your experience, @dwburger. For me slow npm install
is not a huge problem, because it does not happen frequently, so it does not really matter if an update needs 5 or 10 minutes. But if it freezes or the Mirror itself freezes, than it is a serious issue.
Dear Reader, if you tried MagicMirror on RPi Model 3A+, please share your experience in this thread! Thank you.