Long Loading Times IE 11

[Klaus]

Hi,

I'm using Telerik UI for ASP.NET/AJAX and deployed my Website on IIS 7.5.7600.16385 on an Windows Server 2008 R2 Standard.

On the Server, .NET Framework 4.5.2 is installed.

In order to run the Website with IE 11 i had to add the following section to the webconfig-file:

 

<system.webServer>
<httpProtocol>
<customHeaders>
<add name="X-UA-Compatible" value="IE=Edge" />
</customHeaders>
</httpProtocol>
<modules>
<remove name="FormsAuthentication"/>
</modules>
</system.webServer>

 

Unfortunatedly, the loading times of the Website are very Long compared to when using Mozilla Firefox as Webbrowser (2-3 mins vs. 4-5 secs).

 

Any ideas hints on this?

Thanks,

Klaus

 

[Konstantin Dikov]

Hi Klaus,

The UI for ASP.NET AJAX suite should not cause such difference in the loading time in different browsers, so I could suggest that you make some tests with standard controls (like GridView for example) and see if such delay will be observed. 

Notwithstanding, please have in mind that you can observe such slow performance if you are running IE in compatibility view and if you have complex nested structures with too many DOM elements. If that is the case, you can try to limit the elements on the page by enabling paging for your controls (or some other optimization technique).

Hope this helps.


Regards,
Konstantin Dikov
Telerik

[Klaus]

Hi Konstantin,

 

Thanks for your answer.

I also think, that the UI controls are not responsible for the long loading .. I think it has to do with IE version. For example, if i open my site (the main controls I'm using are the PivotGrid and the HTMLChart) with IE11 and do not include the webconfig-section described in my first post, the page loads with normal loading time, but the HTML-Charts are not displayed.

How can i find out if IE is running in campatibility view and how can i turn it off? Or i can solve the problem, if I find out, why IE11 is not displaying the htmlchart when i'm not using the webconfig-section..

 

Regards, Klaus

[Konstantin Dikov]

Hi Klaus,

I could suggest that you go through the following forum threads and see if any of the suggestions will resolve the issue:

• http://stackoverflow.com/questions/6156639/x-ua-compatible-is-set-to-ie-edge-but-it-still-doesnt-stop-compatibility-mode
• https://github.com/google/web-starter-kit/issues/728
• http://stackoverflow.com/questions/26346917/why-use-x-ua-compatible-ie-edge-anymore

Kind Regards,
Konstantin Dikov
Telerik