When a user is loading a web page, for every object on the page (e.g: images, stylesheets, scripts) there is a corresponding HTTP request made to the server.
These HTTP requests will delay the response time if the web page contains large number of objects.
To reduce the delay, we have to get rid of some of the unnecessary objects.
Then we can think of combining two or more images to one (by using image sprite), we can merge two or more script files and make them one (e.g: Instead of using three/four script files we will use only one).
Then the next question is, “How to combine the Javascipt files?”
<asp:ScriptManager ID="scrManager" runat="server">
<asp:ScriptReference Name="MicrosoftAjax.js" />
<asp:ScriptReference Name="MicrosoftAjaxWebForms.js" />
<asp:ScriptReference Path="~/Scripts/jquery-1.4.1.min.js" />
<asp:ScriptReference Path="~/Scripts/Home.js" />
Hope this helps you.