Delayed loading of team calendars or pages containing calendars when there are more than 1k calendars in a space

Issue Summary

It has been observed that the team calendars may not get loaded or may face a delay in loading when there are more than 1k+ calendars in a space. The same is observed if the calendar has a large number of events.

Steps to Reproduce

1. Take a space that has got 1k+ calendars.  Try to load the calendars in the space by using a URL such as https://testsite.atlassian.net/wiki/spaces/yourspacekey/calendars. We can see that there is a delay in the loading of calendars. This may also result in a timeout at the user end.
2. The same pattern is also noticed when a team calendar has a high number of events, say 100k+ events.

Expected Results

The calendar should get loaded irrespective of the number of calendars or events. Another option is to load only the relevant or latest calendar and events.

Actual Results

All the calendars and events are loaded resulting in a timeout. 

Workaround

It is recommended to archive or delete unused calendars and events for better performance.