Poor performance when you use MSXML6.0 in Windows Server 2008 R2 SP1 or in a 64-bit version of Windows 7 SP1

Symptoms

Assume that you run an application that uses Microsoft Core XML Services (MSXML) 6.0 on a computer that is running Windows Server 2008 R2 Service Pack 1 (SP1) or a 64-bit version of Windows 7 SP1. Additionally, assume that the application uses the 64-bit version of MSXML6.0 to load XML documents. In this situation, the application takes over two times longer to load an XML document than when you use the 32-bit version of MSXML6.0.

Cause

This issue occurs because slot-size and page-size are allocated incorrectly in a function in the 64-bit environment.

Resolution

Hotfix information

A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows 7 SP1 or Windows Server 2008 R2 SP1. For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.16xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    GDR

    6.1.760
    1.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Msxml6.dll

6.30.7601.22208

2,001,920

03-Jan-2013

05:46

x64

Msxml6r.dll

6.30.7600.16385

2,048

14-Jul-2009

01:30

x64

Msxml6.dll

6.30.7601.22208

1,388,544

03-Jan-2013

04:54

x86

Msxml6r.dll

6.30.7600.16385

2,048

14-Jul-2009

01:07

x86

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Msxml6.dll

6.30.7601.22208

3,814,400

03-Jan-2013

04:38

IA-64

Msxml6r.dll

6.30.7600.16385

2,048

14-Jul-2009

01:37

IA-64

Msxml6.dll

6.30.7601.22208

1,388,544

03-Jan-2013

04:54

x86

Msxml6r.dll

6.30.7600.16385

2,048

14-Jul-2009

01:07

x86


Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about MSXML, go to the following Microsoft website:

General information about MSXML 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

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_6114decfa45fb6a4cc5524794de50a6e_31bf3856ad364e35_6.1.7601.22208_none_8ff9da0e3c3e102b.manifest

File version

Not applicable

File size

1,040

Date (UTC)

03-Jan-2013

Time (UTC)

10:03

Platform

Not applicable

File name

Amd64_f430a08a923e50ff68a227e230e61385_31bf3856ad364e35_6.1.7601.22208_none_a075a74f27c2e5b3.manifest

File version

Not applicable

File size

699

Date (UTC)

03-Jan-2013

Time (UTC)

10:03

Platform

Not applicable

File name

Amd64_microsoft-windows-msxml60_31bf3856ad364e35_6.1.7601.22208_none_e72c5130c688079a.manifest

File version

Not applicable

File size

46,456

Date (UTC)

03-Jan-2013

Time (UTC)

10:09

Platform

Not applicable

File name

Wow64_microsoft-windows-msxml60_31bf3856ad364e35_6.1.7601.22208_none_f180fb82fae8c995.manifest

File version

Not applicable

File size

39,203

Date (UTC)

03-Jan-2013

Time (UTC)

10:09

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_d766bcddd048893a1de20bd5d089fb3a_31bf3856ad364e35_6.1.7601.22208_none_98dd355aab677359.manifest

File version

Not applicable

File size

1,038

Date (UTC)

03-Jan-2013

Time (UTC)

10:03

Platform

Not applicable

File name

Ia64_microsoft-windows-msxml60_31bf3856ad364e35_6.1.7601.22208_none_8b0f59a30e289f60.manifest

File version

Not applicable

File size

46,454

Date (UTC)

03-Jan-2013

Time (UTC)

10:03

Platform

Not applicable

File name

Wow64_microsoft-windows-msxml60_31bf3856ad364e35_6.1.7601.22208_none_f180fb82fae8c995.manifest

File version

Not applicable

File size

39,203

Date (UTC)

03-Jan-2013

Time (UTC)

10:03

Platform

Not applicable


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