On some pages, you may wish to have pagination, exposed filters, or table sorting refresh the View using AJAX, rather than refresh the entire page. This is particularly helpful on block displays, especially when there may be multiple filters or pagers on the same page. All that is necessary is to click No next to the label Use AJAX, selecting the checkbox for Use AJAX and then saving all Displays or only the current Display. Once it has been enabled using those functions, it causes a small animated GIF to be displayed to indicate progress and then have the content of the View replaced when the site responds.
Using AJAX to perform these operations means that the current URL is not updated to reflect the page, filter, or sorting criteria used, which means navigating to a bookmark or refreshing your page will reset these values.