Error message after migrating / reinstalling plugins

Hey guys!
I just migrated my WP site from a sub domain to the primary domain at using backupbuddy.
After migrating, everything seems to be ok, however the performance of the site has a much lower rating than the original development site (
I thought maybe uninstalling the WPmudev plugins and then reinstalling might help, but I'm receiving an error message (red bar at top of page with "message") when trying to activate the reinstalled plugin (hummingbird / smush).
Could there be a conflict due to the migration?
Many thanks,

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