Generally we put static content (images, css, js) of our website inside the same web project. Thus they get downloaded from the same domain like www.dropthings.com. As browser can only open two concurrent connections, all of these download only two at once. If you move the static content to a separate domain, browser can download more content in parallel and thus load the page faster. This HttpFilter parses the page output and automatically moves all static content links to a different domain as specified.