A system generates a web page that includes a plurality of embedded data windows. The system receives a request for the web page from a browser and in response generates and displays a frame for the web page on the browser. The frame includes holes for the embedded data windows. The system also receives a data streaming request for each of the embedded data windows and determines if the data streaming requests are thread-safe. For all the data streaming requests that are thread-safe, the system generates a parallel thread to fetch the data for each corresponding data streaming requests. When the data has been fetched for a particular data streaming requests, the data is rendered and streamed to the browser where it is displayed in place of the hole by the browser.