What’s New in ASP.NET 9
Standard Term Support release highlights
- Native AOT Support — Enhanced Native Ahead-of-Time compilation for smaller, faster applications with reduced startup times and memory usage.
- Improved Minimal APIs — Better route grouping, improved parameter binding, streamlined authentication.
- Enhanced Identity Framework — Easier configuration, better token management, multi-factor authentication.
- Rate Limiting Improvements — More flexible policies, better concurrency control, improved performance.
Key Features
Production hosting infrastructure
- Native AOT Compilation — Optimized environment for AOT compiled applications with faster cold-start times
- Enhanced Security — Web Application Firewall, automatic vulnerability scanning, free auto-renewing Let’s Encrypt SSL via Plesk for Windows
- Continuous Deployment — CI/CD pipeline integration with GitHub Actions, Azure DevOps, MSDeploy
- Database Layer — Entity Framework Core 9 against real SQL Server 2022 plus optional MariaDB
.NET 9 STS — What this means for your roadmap
Planning the upgrade window
.NET 9 is a Standard Term Support (STS) release with 18 months of Microsoft support. While we continue to host .NET 9 applications side-by-side with newer runtimes, we recommend planning an upgrade to .NET 10 LTS to maximise your support window.
- What’s new in .NET 9 — Microsoft official overview
- .NET support policy — LTS vs STS schedules
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