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.NET Framework 3.5 / 4.8.1 .NET Framework 3.5 / 4.8.1 Optional preview
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KB5036034

KB5036034: Cumulative update for .NET Framework, versions 3.5 and 4.8.1, on Windows 10 22H2, March 2024. ASP.NET performance and .NET runtime issues addressed

In short

Addresses a performance issue in ASP.NET and several .NET runtime and compiler issues. A restart is required if affected files are in use.

Does it affect you? Applies to: Devices running Windows 10 version 22H2 with .NET Framework 3.5 or 4.8.1 installed.

File version
2.0.50727.9176 · 4.8.9232.0
Restart
Required

What changes

Fixes 4 changes

.NET Libraries

Verified in package
  • Addresses a performance issue in ASP.NET applications after installing the January 2024 .NET Framework update.1

.NET Runtime

2 items
  • Addresses an issue that can make thread pool recycled lists unresponsive on computers with multiple CPU groups.2
  • Addresses an issue where Interlocked.Read from 32-bit apps runs much slower on some computers.3

.NET Compilers

  • Addresses an issue compiling code with the native C# compiler when it calls COM interop assemblies.4
    The issue concerns the native C# compiler (csc.exe).

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2024-03-26
Classification
Updates
Type
Cumulative update
Restart
Required
VersionFile versionChannel
3.5 2.0.50727.9176 General availability
4.8.1 4.8.9232.0 General availability

Security

No vulnerabilities are listed for this update.

Updated components

58 files changed since the previous update for the same versions.

Top changed componentsFiles
.NET runtime (CLR)18
ASP.NET15

Verified in package: changed files confirm .NET Libraries.

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. Addresses a performance issue in ASP.NET applications after installing the January 2024 .NET Framework update. support.microsoft.com
  2. 2. Addresses an issue when thread pool recycled lists become unresponsive on multi-CPU-group computers. support.microsoft.com
  3. 3. Addresses an issue where Interlocked.Read from 32-bit apps are much slower on some computers. support.microsoft.com
  4. 4. Addresses an issue when using the native C# compiler (csc.exe) to compile code making calls to COM interop assemblies. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Nov 8, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake