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As you interact with the view on the server, it will sometimes have to send a query to the data source to update the data in the view. If you are working with a dense view with a lot of data or a very large data source, the automatic update may take a long time. To avoid waiting for each update while you make several changes you can click Pause Automatic Updates on the toolbar.
When you Resume Automatic Updates using the same toolbar button you only have to wait for a single query to the data source.