Microsoft KB Archive/918966

= FIX: Internet Explorer responds very slowly when you scroll through a Web page that contains more than 50 ActiveX controls =

Article ID: 918966

Article Last Modified on 11/15/2007

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APPLIES TO


 * Microsoft Internet Explorer 6.0, when used with:
 * Microsoft Windows XP Service Pack 2

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Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
Consider the following scenario:
 * Your computer is running Microsoft Windows XP Service Pack 2 (SP2).
 * You have applied the update for Microsoft Internet Explorer 6 that is mentioned in Microsoft Knowledge Base (KB) article 912945.

In this scenario, you may notice that Internet Explorer responds very slowly when you scroll through a Web page that contains more than 50 ActiveX controls.

Note You may also experience this problem after you apply the 912945 Internet Explorer update on a computer that is running Microsoft Windows Server 2003 Service Pack 1 (SP1).



CAUSE
This problem occurs because of the way in which Internet Explorer handles z-ordering of the mask window that is displayed over non-activated ActiveX controls. The 912945 Internet Explorer update changes the way that Internet Explorer handles z-ordering. When you scroll through the Web page, the scroll action causes Internet Explorer to recalculate the z-ordering of the mask window for each movement. This task consumes lots of CPU cycles.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
To apply this hotfix, you must have Windows XP SP2 installed on the computer.

Registry information
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

After you apply this hotfix, you must enable it. To do this, follow these steps:  Make sure that Internet Explorer is closed. Click Start, click Run, type regedit in the Open box, and then click OK. Locate and then click the following registry subkey:

 

 On the Edit menu, point to New, and then click Key. Type FEATURE_ACTIVEX_MITIGATION_PERFORMANCE_KB918966, and then press ENTER. Click FEATURE_ACTIVEX_MITIGATION_PERFORMANCE_KB918966. On the Edit menu, point to New, and then click DWORD Value.</li> Type Iexplore.exe, and then press ENTER.</li> Right-click Iexplore.exe, and then click Modify.</li> In the Value data box, type 1, and then click OK.</li> On the File menu, click Exit to exit Registry Editor.</li></ol>

Restart requirement
You must restart the computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

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WORKAROUND
To work around this problem, you can design Web pages so that they automatically activate ActiveX controls. For more information, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/ms537508.aspx

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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

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MORE INFORMATION
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kbexpertiseinter kbwinxpsp2fix kbbug kbfix kbhotfixserver kbqfe kbpubtypekc KB918966

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