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FullCalendar

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rerenderDelay

The amount of milliseconds to wait before rerendering anything on a calendar.

Integer / null (turned off, the default)

When this value is specified as a millisecond number value, the calendar will begin to wait after any operation that might result in rerendering. The rerendering could be a result of any action, such as a changing of the current view or an addEvent call. After this time has passed, the calendar will rerender what it needs to all-at-once. This can reduce the number of rerenders, for performance reasons.