In Ext JS 5.x bufferedRendering is true by default. Configuring columns. By default, each column is sortable and will toggle between ASC and DESC sorting when you click on its header. Each column header is also reorderable by default, and each gains a drop-down menu with options to hide and show columns. It's easy to configure each column
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This flag indicates that the renderer produces HTML. If this column is going to be updated rapidly, and the Ext.grid.column.Column#renderer or cfg-updater only produces text, then to avoid the expense of HTML parsing and element production during the update, this property may be configured as false. Defaults to: true
sortable: Specifies whether the column can be sorted by clicking the header or using the column menu; Data Options. dataIndex: The dataIndex is the field in the underlying Ext.data.Store to use as the value for the column. renderer: Allows the underlying store value to be transformed before being displayed in the grid.