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Posted 14 Jul 2009

Combine Ajax axd Files into One to Improve Performance

, 14 Jul 2009
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How to combine Ajax and files into one to improve performance

If we use Ajax or Ajax related controls, then we'll find that a lot of script related requests are made to the server. Browser can request two concurrent requests to the server. For example, browser may request for an image and while the image is loading, the browser may request for an CSS file. But in case of JavaScript, browser can't request for two files. When browser requests for a script file, it stops for any other request to the same server.

When you use Ajax or Ajax related tools (such as AjaxControlToolkit), the browser sends asynchronous requests to the server which is of extension (.axd). The number of asynchronous requests in axd form, the more time it'll take to load the page. So if we can combine those axd requests into one then we can get noticeable improvement in page loading.


Figure: axd requests to the server

Here are the steps to combine axd scripts to a single one.

  1. Find all the JavaScript references in your page. To do so, download the script reference profile from here. Then register the DLL in your page and add the scriptreference profile as shown below:

    Register the DLL in page:

    <%@ Register Assembly="ScriptReferenceProfiler" 
        Namespace="ScriptReferenceProfiler" TagPrefix="microsoft" %>

    Add Control to the page:

    <microsoft:ScriptReferenceProfiler ID="profiler1" runat="server" />

    After adding the script profiler, if you run the page, then you will find all the script references in your page as shown below. Remember you can't combine Microsoft provided js file like MicrosoftAjax.js, MicrosoftAjaxWebform.js, etc.


    Figure: Script reference found by script profiler
  2. Then use the scriptmanager's combinescript tag to combine script:
    <asp:ScriptManager ID="sm1" runat="server" CompositeScript-ScriptMode="Release">
                <asp:ScriptReference Name="AjaxControlToolkit.Compat.Timer.Timer.js" 
                    Assembly="AjaxControlToolkit, Version=3.0.20820.23813, 
                    Culture=neutral, PublicKeyToken=28f01b0e84b6d53e" />
                    Assembly="AjaxControlToolkit, Version=3.0.20820.23813,
                    Culture=neutral, PublicKeyToken=28f01b0e84b6d53e" />

After combining those scripts, you'll find that the page loading time improved significantly. A useful links is given below:


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Architect ImpleVista Aps
Denmark Denmark
Sohel has more than six years of experience in professional software development with extensive involvement in Web based Object-Oriented, Multi-Tiered application design and development. He's Familiar with Test Driven Development (TDD) and refactoring techniques as well as having expertise in architecturing large enterprise applications. He has Experience in working with Content Management System and Portal Management System tools like SharePoint, DotNetNuke, Ektron.

Over last few years, he’s involved in development with projects on Microsoft SharePoint and received Microsoft MVP for SharePoint Server Development in the year 2011 and 2012. Currently he's working in a software company located Copenhagen,Denmark on a project integrating SharePoint and SAP. You can read his popular blog at:

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