In ISE 11.1 software and later the generation of Asynchronous reports iscontrolled by a Place and Rout process property. Right-click on Place & Route in the Processes window and select Process Properties. In the Process properties window, select the check box next to "Generate Asynchronous Reports" toenable theAsynchronous Delay Report generation.
To display the report, open up the Design Summary from the Processes window, right-clickon the reports pane and select Show/Hide Reports. Enable Asynchronous DelayReport in the Secondary Reports section.