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dotNET6

FileStream

The System.IO.FileStream type has been rewritten for .NET 6 to provide better performance and reliability on Windows. Now, FileStream never blocks when created for asynchronous I/O on Windows.

Profile-guided optimization

Profile-guided optimization (PGO) is where the JIT compiler generates optimized code in terms of the types and code paths that are most frequently used. .NET 6 introduces dynamic PGO. Dynamic PGO works hand-in-hand with tiered compilation to further optimize code based on additional instrumentation that's put in place during tier 0. Dynamic PGO is disabled by default, but you can enable it with the DOTNET_TieredPGO environment variable.

Crossgen2

.NET 6 introduces Crossgen2, the successor to Crossgen, which has been removed. Crossgen and Crossgen2 are tools that provide ahead-of-time (AOT) compilation to improve the startup time of an app. Crossgen2 is written in C# instead of C++, and can perform analysis and optimization that weren't possible with the previous version.

Arm64 support

The .NET 6 release includes support for macOS Arm64 (or "Apple Silicon") and Windows Arm64 operating systems, for both native Arm64 execution and x64 emulation.

Hot reload

Hot reload is a feature that lets you modify your app's source code and instantly apply those changes to your running app.

C# 10 and templates

C# 10 includes innovations such as global using directives, file-scoped namespace declarations, and record structs.

System.Text.Json APIs

Many improvements have been made in System.Text.Json in .NET 6, such that it is now an "industrial strength" serialization solution.

Writeable DOM

A new, writeable document object model (DOM) has been added, which supplements the pre-existing read-only DOM. 

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