By default the .NET Framework/Mono variants are still used, but you can opt into having the .NET 6.0 builds by setting the following in your VS Code settings

{
    "omnisharp.useModernNet": true
}

Performance improvements in ASP.NET Core 6 

Raising Coding Standards with .NET 6.0 Code Analyzers 

2021 was no exception and the following are some of the new areas where you’ll now find WebAssembly

• • The Disney+ Application Development Kit is using WebAssembly: https://medium.com/disney-streaming/introducing-the-disney-application-development-kit-adk-ad85ca139073
  • A simplified version of Photoshop on the web was released: https://www.theverge.com/2021/10/26/22738125/adobe-photoshop-illustrator-web-announced
  • Microsoft’s Flight Simulator has a WebAssembly-based plugin system: https://docs.flightsimulator.com/html/Programming_Tools/WASM/WebAssembly.htm
   

You can download 6.0.1, 5.0.13 and 3.1.22 versions for Windows, macOS, and Linux, for x86, x64, Arm32, and Arm64.

• Installers and binaries: 6.0.1 | 5.0.13 | 3.1.22
• Release notes: 6.0.1 | 5.0.13 | 3.1.22
• Container images
• Linux packages: 6.0.1 | 5.0.13 | 3.1.22
• Release feedback/issue
• Known issues: 6.0 | 5.0 | 3.1

Improvements

• ASP.NET Core: 6.0.1 | 5.0.13 | 3.1.22
• EF Core: 6.0.1
• Runtime: 6.0.1 | 5.0.13
• Winforms: 6.0.1 | 5.0.13  

.NET 6 vs .NET 4.8 GC stats - ~64% shorter max GC pause times (due to 1 letter removed in runtime) 

Rider 2021.3: Support for .NET 6 SDK, Redesigned Main Toolbar and Debug Tab, and New Problems View Tab 

Support for the .NET 6 SDK, including Hot Reload  

Get to Know EF Core 6 - .NET Blog