If a pivot grid is working with a large dataset, retrieving data from a data source as well as performing various data-aware operations, such as sorting or filtering data, may take a considerable amount of time.
In a standard (synchronous) mode, the entire application would not respond to user actions until the pivot grid completes the required operations, since the primary UI thread is busy. End-users can notice a small or considerable application freeze.
In an asynchronous mode, only the pivot grid is frozen. The application continues interacting with an end-user, while the control is processing data in a background thread. While processing data, the pivot grid displays a loading panel to indicate that this control is busy and would not respond to user actions until the operation is completed.
Learn More: Asynchronous Mode
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