# F# Weekly #42, 2026 - F# 11 RC2 & compiler performance improvements

**URL:** <https://forums.fsharp.org/t/f-weekly-42-2026-f-11-rc2-compiler-performance-improvements/5218>\
**Category:** General\
**Tags:** news\
**Created:** [October 17, 2026, 5:35pm UTC](https://forums.fsharp.org/t/f-weekly-42-2026-f-11-rc2-compiler-performance-improvements/5218 "2026-10-17T17:35:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sergey\_tihon](https://yyz2.discourse-cdn.com/flex030/user_avatar/forums.fsharp.org/sergey_tihon/32/25_2.png) [@sergey\_tihon](https://forums.fsharp.org/u/sergey_tihon)\
**Post date:** [October 17, 2026, 5:35pm UTC](https://forums.fsharp.org/t/f-weekly-42-2026-f-11-rc2-compiler-performance-improvements/5218/1 "2026-10-17T17:35:22Z")

</div>

Welcome to F# Weekly,

A roundup of F# content from this past week:

**News**

- [F# in .NET 11 RC 2 - Release Notes](https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/rc2/fsharp.md)
- [Performance improvements in the F# 11 compiler](https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/rc2/fsharp-memory-savings.md)

**Microsoft News**

- [Introducing dotnetup: A toolchain manager for .NET](https://devblogs.microsoft.com/dotnet/introducing-dotnetup/)
- [Announcing .NET 11 Release Candidate 2](https://devblogs.microsoft.com/dotnet/dotnet-11-rc-2/)
- [Durable Task in the Real World: What Problems Does It Actually Solve?](https://devblogs.microsoft.com/dotnet/durable-task-in-the-real-world/)
- [Stop waiting on a failed build - Visual Studio Blog](https://devblogs.microsoft.com/visualstudio/stop-waiting-on-a-failed-build/)
- [What's new in Microsoft Foundry | September 2026 | Microsoft Foundry Blog](https://devblogs.microsoft.com/foundry/whats-new-in-microsoft-foundry-september-2026/)

> **[Sergey Tihon 🦔🦀 (@sergeytihon.com)](https://bsky.app/profile/sergeytihon.com/post/3mxy2nrimas2t)**
>
> Wow, what is an update: F# in .NET 11 RC 2 #fsharp https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/rc2/fsharp.md

**Videos**

- [.NET Unboxed: .NET 11 Release Candidate 2](https://www.youtube.com/watch?v=Y3boNyKHc_k)
- [Houston Haynes - The Clef Programming Language - A Ship of Theseus Story - YouTube](https://www.youtube.com/watch?v=XsTgFacg7G4)
- [.NET + Foundry, better together](https://www.youtube.com/watch?v=mHrs-JHdPaY)
- [.NET AI Community Standup: Build agentic experiences with the Blazor AI Components - YouTube](https://www.youtube.com/watch?v=2KwwPKryozI)

**Blogs**

- [Event Sourcing: A close look at the projector for values – planetgeek.ch](https://www.planetgeek.ch/2026/10/12/event-sourcing-a-close-look-at-the-projector-for-values/)

[https://twitter.com/tomasgrosup/status/2110236919523111122](https://twitter.com/tomasgrosup/status/2110236919523111122)

**Highlighted projects**

- [AngelMunoz/MVUish.Avalonia - lightweight, performant Model-View-Update (MVU) library for Avalonia, designed for both C# and F#.](https://github.com/AngelMunoz/MVUish.Avalonia)
- [EluciusFTW/SpectreTuff: A thin, opinionated wrapper around Spectre.Tui in F#.](https://github.com/EluciusFTW/SpectreTuff)
- [WillEhrendreich/SageFs: Sage Mode for F# development — REPL with solution or project loading, Live Testing for FREE, Hot Reload, and session management.](https://github.com/WillEhrendreich/SageFs)
- [TheAngryByrd/fsharp-skills - Reusable instructions for AI agents working on F# code](https://github.com/TheAngryByrd/fsharp-skills)

**New Releases**

- [Fable 5.22.0](https://www.nuget.org/packages/Fable/5.22.0)
- [NBomber 6.7.1](https://www.nuget.org/packages/NBomber/6.7.1)
- [SageFs 0.6.908](https://www.nuget.org/packages/SageFs/0.6.908)
- [FsUnit 8.0.0](https://www.nuget.org/packages/FsUnit/8.0.0)
- [Expecto 11.1.1](https://www.nuget.org/packages/Expecto/11.1.1)
- [Thoth.Json 10.5.2](https://www.nuget.org/packages/Thoth.Json/10.5.2)
- [Farmer 1.9.33](https://www.nuget.org/packages/Farmer/1.9.33)
- [WebSharper 10.1.6.678](https://www.nuget.org/packages/WebSharper/10.1.6.678)
- [MVUish.Avalonia 1.0.1](https://github.com/AngelMunoz/MVUish.Avalonia/releases)

That’s all for now. Have a great week.

[![Buy Me A Coffee](https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png)](https://www.buymeacoffee.com/sergeytihon)