.NET 10 reached general availability on May 12, 2026. The release focuses on reduced memory pressure in long-running services and faster startup for containerized applications. Production teams on Windows Server can expect lower P99 latency after recompilation with the new Native AOT defaults.

C# 14 introduces targeted improvements to pattern matching and collection expressions rather than large syntax changes. The runtime also ships with an updated garbage collector that reduces full GC pauses on servers with many small objects. These changes are immediately available in the current LTS channel.

#Runtime and AOT Changes

Native AOT compilation is now the recommended path for most ASP.NET Core minimal APIs and background services. The compiler produces smaller binaries and removes the need for a JIT at startup. Benchmarks published with the release show a 30-40 percent reduction in cold-start time on IIS when compared with the previous JIT configuration.

The garbage collector received a new server-mode heuristic that detects allocation spikes more quickly. Applications that allocate many short-lived objects see fewer gen2 collections. Existing code requires no changes; the behavior activates automatically when the server GC is enabled.

#C# 14 Language Additions

C# 14 adds extended property patterns and allows list patterns inside switch expressions on ReadOnlySpan<T>. These features reduce the need for manual indexing when parsing small binary protocols or configuration records.

csharp 
if (buffer is [0x02, .. var payload, 0x03])
{
    Process(payload);
}

#ASP.NET Core and Hosting Updates

  • Minimal API endpoints now support built-in rate-limiting metadata without additional middleware registration.
  • The Kestrel transport layer exposes new socket options for TCP keep-alive tuning on Windows Server 2025.
  • OpenAPI document generation moved to a source-generator model, eliminating reflection at startup.

These hosting changes require no code changes when targeting the .NET 10 SDK but do require an update to the project file SDK version.

#Practical Upgrade Steps

Update the SDK to 10.0.100 or later and change the TargetFramework to net10.0. Rebuild with PublishAot=true for services that can tolerate the current AOT limitations around reflection. Run load tests on a staging IIS instance before promoting the new binaries. Monitor GC metrics for the first week to confirm the expected reduction in collection frequency.