Images takes much time to load in asp repeater

I have a repeater in which I place <asp:Image> in which ImageUrl='<%# DataBinder.Eval(Container.DataItem, "Path") %>' Path in the Container.Dataitem is the URL of the images which shown in repeater and URL makes a string with the help of select query There will be almost 140 images which will be load in asp repeater and it takes 20 second to load all images ..but my requirement is to manage it to 5 to 6 seconds...
As well as i observed some solution like you could use AJAX to load them one at a time. You can then control the order in which they are loaded (eg load top 10 first, then load next 10). Similar to how Facebook does photo uploads. But how i use it...? means which extender i use
Do you guys have any solution