This article describes hotfix rollup 3146718, which is available for the Microsoft .NET Framework 4.5.2, 4.5.1, and 4.5. For more information about the issues that the hotfix rollup fixes, see the "Issues that this hotfix rollup fixes" section.
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119591 How to obtain Microsoft support files from online services
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Note To verify the hotfix update version, check the value of the Release keyword to determine the installed version. To be forward-compatible, you can check for a value that's greater than or equal to the value that's listed in the following table.
Hotfix Rollup Version
Value of the Release DWORD
Hotfix rollup 3146711 for the .NET Framework 4.5 and later versions
To apply this hotfix, you must have the .NET Framework 4.5.2, 4.5.1, or 4.5 installed.
You have to restart the computer after you apply this hotfix if any affected files are being used. We recommend that you close all .NET Framework-based applications before you apply this hotfix.
Hotfix replacement information
This hotfix package doesn't replace a previously released hotfix package.
Issues that this hotfix rollup fixes
Contention and bad performance on System.Web.BufferAllocator when you run a web application on computers that have more than 32 cores.
Fix: The contention has been eliminated by removing the global lock in System.Web.BufferAllocator.
Windows Forms issue
The Windows Forms PrintPreviewDialog UI is initialized very slowly when the following conditions are true:
A network printer is used.
User preferences for this printer, such as duplex settings, are modified.
Performance optimization has been added to this scenario. If page settings are not modified for a specific page, printer settings are not reapplied (by accessing to the printer spooler) for this page. If the application modifies printer settings by using the QueryPageSettings event handler, print preview generation performance for the affected pages will not improve even if the opt-in flag is set.
In order to opt in to this optimization, the following key should be added to the app.config file, depending on your version of .NET Framework
If an application can run on either version of the .NET Framework, use both switches in the same file.
To opt out, remove the switches, or set the values to false. ClickOnce issue
ClickOnce has been updated to support TLS 1.1 and 1.2. ClickOnce now automatically detects which TLS protocol is required at runtime. There are no extra steps required in ClickOnce to enable this functionality.
Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.5.1, Microsoft .NET Framework 4.5, Windows 8.1, Windows RT 8.1, Windows 8, Windows RT, Windows Server 2012 Standard, Windows Server 2012 R2 Standard, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 Service Pack 2, Windows 7 Service Pack 1, Windows Vista Service Pack 2