[FIX] calendar: improve calendar recurrency creation performances

Improve calendar recurrency creation performances by moving the call to
super().create out of the for loop.  For a client database with 120
recurrences creating around 50k calendar events in total, the 5 times
averaged execution time went from 1410s to 630s, so a speed up slightly
bigger than 2.

1 files changed, 4 insertions, 3 deletions

diff --git a/addons/calendar/models/calendar_event.py b/addons/calendar/models/calendar_event.py
index 61ce4ef387d..558855c1abe 100644
--- a/addons/calendar/models/calendar_event.py
+++ b/addons/calendar/models/calendar_event.py
@@ -717,11 +717,12 @@ class Meeting(models.Model):
         events = super().create(other_vals)
 
         for vals in recurring_vals:
+            vals['follow_recurrence'] = True
+        recurring_events = super().create(recurring_vals)
+        events += recurring_events
 
+        for event, vals in zip(recurring_events, recurring_vals):
             recurrence_values = {field: vals.pop(field) for field in recurrence_fields if field in vals}
-            vals['follow_recurrence'] = True
-            event = super().create(vals)
-            events |= event
             if vals.get('recurrency'):
                 detached_events = event._apply_recurrence_values(recurrence_values)
                 detached_events.active = False