I’m not the developer, but I can try to answer your questions
1) performance will depend on the queries you use. With relationship field I would look into 2 way relationship. There is code on this site that will help as well as plugins available. There are a lot of other things that can be looked at but far too many to list them all here.
3) No. ACF uses the standard jQuery date field. To use a different type of calendar you would probably be looking at building a new field type add on plugin that uses a modified version of the datepicker like this one https://www.npmjs.com/package/persian-datepicker
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⚠️ WP 5.0 with Classic Editor 1.0 Installed is causing a WSOD when editing field groups. To fix: Go to Settings > Writing and then set “Default editor for all users” to “Classic Editor” and “Allow users to switch editors” to “No”. Discussion here: https://t.co/THWkB7iidM