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Assume that you use Microsoft Visual Studio 2015. When the installed Visual Studio Extensions listen to the VSWebSiteEvents.AssemblyReferencesEvents object, you experience poor performance and freezes in Visual Studio.


This issue occurs because the Visual Studio Extensions listen to the AssemblyReferenceEvents object that enables all the VSWebSiteEvents objects. This may cause computationally expensive code paths to be enabled even though they aren't being consumed.


This update is available from the Microsoft Download Center.

Microsoft Download Center
The following file is available for download from the Microsoft Download Center:
Download the hotfix package now.

For more information about how to download Microsoft support files, see the following article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services

Hotfix Information

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.


This hotfix requires Visual Studio 2015 Update 3.

Restart information

You may have to restart the computer after you apply this hotfix.

Replacement information

This hotfix does not replace any previously released hotfix.
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.

File name

File version

File size











Learn about the terminology that Microsoft uses to describe software updates.

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