RadPanelBar slow expand/collapse in IE7

3 posts, 0 answers
  1. Kees
    Kees avatar
    2 posts
    Member since:
    Aug 2010

    Posted 17 Mar 2011 Link to this post

    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"

    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
  2. Dimitar Terziev
    Dimitar Terziev avatar
    1266 posts

    Posted 22 Mar 2011 Link to this post

    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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  4. Chuck
    Chuck avatar
    30 posts
    Member since:
    Sep 2010

    Posted 10 Jan 2012 Link to this post

    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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