What’s New in .NET 11 Preview 1 & 2: Runtime Async, Zstandard, Blazor TempData, and Vector Search
Explore .NET 11 Preview 1 & 2: Runtime Async V2, native Zstandard, Blazor SSR TempData, EF Core vector search, OTel tracing, and CLI wins.
What’s New in .NET 11 Preview 1 & 2: Runtime Async, Zstandard, Blazor TempData, and Vector Search
TL;DR: .NET 11 Preview 1 brings Zstandard compression, AI/ML types, async runtime upgrades, and UI/tooling improvements. Preview 2 extends this with Blazor TempData, OpenTelemetry, EF Core vector search, smaller SDK images, MAUI enhancements, and further performance gains.
.NET 11 Preview 1 and Preview 2 are out, and they’re worth a look if you build high-throughput services, modern web apps with Blazor, or you’re starting to bring AI-ish workloads (embeddings, semantic search, model inference) into “normal” line-of-business systems.
This post focuses on four updates that materially change what you can do (or how easy it is to do it):
- Runtime Async (Preview 1, refined in Preview 2).
- Native Zstandard (zstd) compression (Preview 1).
- Blazor TempData for SSR (Preview 2).
- EF Core vector search for SQL Server (Preview 2).
I’ll also call out a few smaller but meaningful tooling/platform changes at the end.
What shipped in Preview 1 vs Preview 2 (quick map)
Preview 1 highlights
- Native Zstandard (zstd) compression APIs.
- Runtime Async foundation (enabled for experimentation via preview features).
**BFloat16** type for AI/ML and numerics scenarios.- C# preview improvements like collection expression arguments.
Preview 2 highlights
- Blazor TempData support for static SSR scenarios.
- Native OpenTelemetry tracing support in ASP.NET Core (baseline enablement).
- EF Core vector search support for SQL Server (vector distance + indexing support).
- Runtime Async V2 refinements.
- Smaller SDK/container images and a bunch of runtime/SDK polish.
Libraries: Powerful new APIs and performance wins
The Base Class Library (BCL) gains several production-ready additions that solve real-world pain points.
Related Blogs
- .NET 11 Preview for .NET MAUI: Simplify XAML with Inline C# Expressions
- What’s New in .NET 10 Preview: Top Features Developers Shouldn’t Miss
- What’s New in ASP.NET Core 10 for .NET 10: Key Features and Enhancements
- Syncfusion Announces Day-1 Support for .NET 10 in Blazor Components
Originally published at https://www.syncfusion.com on April 7, 2026.
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- https://medium.com/syncfusion/whats-new-in-net-11-preview-1-2-runtime-async-zstandard-blazor-tempdata-and-vector-search-d3b9e4dcf6e5
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- 2026-09-06 19:21:45
