Smart Date Recur - Fullcalendar View

I hope that you actually mean "recurring indefinitely" instead of "infinitely recurring" :P

This has been previously discussed in #3301162: Recurring dates cause slow calendar load → and 💬 SmartDate Field very slow in Views (Full Calendar) Active .

Wanted to add an update to this in case anyone is encountering this problem.

After some experimentation, I was able to determine the performance hit was actually coming from date formatting. Steps to fix:

1. Switch view to "Calendar View" rather than "fullcalendar view"
2. Change calendar date field to "plain" formatter.
3. Copy the template "calendar-view-day.html.twig to your theme
4. Add this line in the row output and modify to your desired date format:
   
   {{ row['#values'].value | date('h:ma')}} - {{ row['#values'].end_value | date('h:ma') }}