Issues that this hotfix rollup fixes
ASP.NET
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
Windows Forms
PrintPreviewDialog UI is initialized very slowly when the following conditions are true:
- A network printer is used.
- Users preference for this printer, such as duplex settings, are changed.
We have added a performance optimization to this scenario. If page settings were not changed for a specific page, we are not re-applying (by accessing the printer spooler) printer settings for this page. If the application is changing printer settings by using the
QueryPageSettings event handler, print preview generation performance for the affected pages is 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:
On the .NET Framework 4.5.2:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
< appSettings >
< add key="OptimizePrintPreview" value="true" />
< /appSettings >
</configuration>
On the .NET Framework 4.6 or a later version:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
< runtime>
< AppContextSwitchOverrides value = "Switch.System.Drawing.Printing.OptimizePrintPreview=true" />
< /runtime>
</configuration>
If an application can run on either version of the .NET Framework, use both switches in the same file.
To opt out, change the switched or set values to
false.
ClickOnce
ClickOnce has been updated to support TLS 1.1 and 1.2. ClickOnce automatically detects which TLS protocol is required at runtime. No additional steps are required within the ClickOnce application to enable this feature.
Note ClickOnce continues to support TLS 1.0 for the foreseeable future, even though it is
no longer considered acceptable for PCI Compliance.
