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RadPanelBar slow expand/collapse in IE7

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Kees
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Kees asked on 17 Mar 2011, 10:49 AM
Hello,
I have a RadPanelBar inside a RadPane/Splitter and it expands/collaps very slow and the navigateUrl opens slow. This is only in IE7, other browsers work fast (IE8, FF3.6, Safari, Chrome) When I click the PanelBarItem, the CPU will rice to 100% for a short period, until it finally expands/collaps or opens the navigateUrl.

If the RadPanelBar is outside of the RadPane/Splitter it still expands/collaps slow, but slightly faster than inside the RadPane/Splitter. The demos I see at the Telerik website also run slow on IE7 (tested this on 3 different computers)

The RadPanelBar is initialised like this:

<telerik:RadPanelBar runat="server" ID="LeftMenu" Width="200" ExpandMode="SingleExpandedItem"
    AllowCollapseAllItems="true" CollapseAnimation-Type="None" CollapseAnimation-Duration="0"   
    ExpandAnimation-Duration="0" ExpandAnimation-Type="None" PersistStateInCookie="false"
     EnableEmbeddedBaseStylesheet="true" EnableEmbeddedSkins="false" EnableViewState="true" CollapseDelay="0"
      ExpandDelay="0"
     >
</telerik:RadPanelBar>

The PanelBarItems are added dynamicly, but for some (I use multiple RadPanelBars on a single page) they are in the aspx. There is no difference in behaviour.

Does anyone know this issue?

With kind regards,

Kees de Wit

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Dimitar Terziev
Telerik team
answered on 22 Mar 2011, 01:45 PM
Hello Kees,

Usually the performance of a certain page depends on the amount of HTML markup and scripts. We haven't noticed a significant lack of performance when using our controls in IE7.

My suggestion is to check this article here, which gives a couple of tips how to improve the performance of our controls.

All the best,
Dimitar Terziev
the Telerik team
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Chuck
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answered on 11 Jan 2012, 03:30 AM
I have the same issue with IE7 only.  Using Q3 2011.03.1115.35.
I will check out the performance suggestions.
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Dimitar Terziev
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Chuck
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