A long delay occurs before a data tip is displayed when you switch to the Watch window or rest the mouse on an item

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Symptoms

When you edit a project in Microsoft Visual Studio 2012 and then switch to the Watch window or rest the mouse on an item, a long delay may occur before the data tip is displayed.

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Cause

This behavior occurs because of a problem in the expression evaluation. The Debug Interface Access (DIA) API unnecessarily turns a non-regular expression search into an expensive regular expression search. This behavior occurs because of a workaround for a very old issue that occurs when the compiler generates symbol names.

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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, go to the following Microsoft website:

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

Note 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 have Update 4 for Visual Studio 2012 installed.

Restart information

You do not 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	Date	Time	Platform
Vs11-kb2958370.exe	11.0.61113.0	5,174,944	11-May-2014	00:53	x86

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Workaround

To work around this behavior when .natvis files are not important to the debugging experience, enable the Edit and Continue feature to use an earlier debug engine that does not have this problem.

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