There is provided a system and method for optimizing loading of content data on a webpage by utilizing client-side technology. The system comprising a server and a client device, the client device configured to request a webpage from a server, receive an image tag and a configuration file from the server, determine a selected image from a plurality of images using client capabilities, the image tag, and the configuration file, create an image handle to request the selected image from the server, transmit the image handle to the server, and receive the selected image from the server. The client device may also receive supported advertisements from the server, select at least one advertisement from the supported advertisements using the client capabilities, and request the at least one advertisement from the server.