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dotNET7

Performance is a key focus of .NET 7, and all of its features are designed with performance in mind. In addition, .NET 7 includes the following enhancements aimed purely at performance:

  • On-stack replacement (OSR) is a complement to tiered compilation. It allows the runtime to change the code executed by a currently running method in the middle of its execution (that is, while it's "on stack"). Long-running methods can switch to more optimized versions mid-execution.
  • Profile-guided optimization (PGO) now works with OSR and is easier to enable (by adding <TieredPGO>true</TieredPGO> to your project file). PGO can also instrument and optimize additional things, such as delegates.
  • Improved code generation for Arm64.
  • Native AOT produces a standalone executable in the target platform's file format with no external dependencies. It's entirely native, with no IL or JIT, and provides fast startup time and a small, self-contained deployment. In .NET 7, Native AOT focuses on console apps and requires apps to be trimmed.
  • Performance improvements to the Mono runtime, which powers Blazor WebAssembly, Android, and iOS apps.

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