A method of rendering an optimized web page or other resource includes requesting a resource and receiving a response including a user interface control declaration and a data array containing properties for the user interface control. The data array is parsed to produce a first property value, and a property of the user interface control is modified to correspond to the first property value. Alternatively, the response may not include a user interface control declaration, but a user interface control may be instantiated having a property that corresponds to the first property value. The property value may have been determined dynamically based at least in part on information provided with the request.