To help reduce latency when an application presents an embedded web view, the application may provide to a web view controller not only a base uniform resource indicator of a web application defining the web view but also preview data for the web view controller to render for presentation together with a cached version of the web view. In accordance with script logic defined by the web application, the web view controller may then (i) incorporate the provided preview data into the cached version of the web view and render the result as a preview view for presentation at a user interface, (ii) download instance data for the web view while the preview view is presented, and (iii) upon receipt of the instance data, establish and render a full version of the web view based on the instance data, for presentation at the user interface.