john smith

C# and .NET developer in the UK. Microsoft certified, ex Head of Infrastructure. I build small .NET tools and write about AI-assisted coding.

[john smith @solrevdev]

C#, .NET and https://t.co/84OzewJPHV Core keeps getting faster. Tempted to use the RC2 go-live license on all the things.

[Ibro @axeng200]

When in doubt, just use C# and https://t.co/gT6MRMoIUK Core.
It's blazing fast.

.NET 11 RC2 is even faster.

For me, it's the best overall major web framework - auth, config, logging, perf, modular middleware, DI, cross-plat, etc.

But I didn't expect this:

[john smith @solrevdev]

Beautiful

[Ben {chmark} Adams ⟠ @ben_a_adams]

@HackingBaseball Fastest part of Ethereum network is C#

[Dustin Górski @dustedcodes]

Aspire is the best product that solves a problem that nobody had and nobody uses.

[Ed Andersen @edandersen]

If CAPCOM can make C# AoT good enough to run Resident Evil 7, 8 etc then Microsoft can make C# AoT good enough to run the TypeScript compiler and Copilot runtime

Just saying

[john smith @solrevdev]

Beautiful. Some C# and .NET is super performant good news again. 🙏🏼️

[Ibro @axeng200]

C# FTW again https://t.co/fsy2Euho8I

Against Python up to 140x faster!

Against Rust from 0.3.3 version that DHH referenced here up to 2.12x

Since you don't like Rust, you can just port it to a much prettier language like C#, and no need to sacrifice performance.

C# on Linux has been such a bliss. So good, and so fast.
For bash-like scripts, tools, CLIs, services, apps.

[john smith @solrevdev]

C# and .NET being speedy and scaleable

[Ben {chmark} Adams ⟠ @ben_a_adams]

C#/.NET being pushed hard running infrastructure at Ethereum's scale.

Nethermind runs on ~3k nodes and accounts for ~33% of staked nodes - supporting a ~$334B native asset, ~$146B of stablecoins and ~$54B deposited in DeFi apps.

Nethermind 2.0 has some amazing performance work in it: up to 2.55x block throughput, p99 block processing from 1.65s to 208ms, eth_call RPC 15-27% faster and Keccak-256 ~30% faster with platform intrinsics.

[john smith @solrevdev]

Microsoft should dogfood C# and .NET a lot more than they do.

[Dan Patrascu-Baba @danpdc]

Microsoft recently ported the GitHub Copilot runtime from TypeScript to Rust in roughly 4 months. The entire port was mostly guided by one single engineer and generated a token cost of around $120k.

Here are few of my thoughts through my CTO lens.

1. Why Rust and not C#?
With AOT, C# was theoretically a possible choice. Yet they decided to use Rust. I'm quite sure this was technically the right choice.

But this puts C# and .NET in a tough spot. On the one hand Microsoft hypes the huge performance improvements and the AOT capabilities.

Yet for their own products that have to deliver at high scale they chose something else.

2. Mostly one engineer took care of the entire port that was executed mostly by coding agents.

However, it's important to note that the engineer doing this was Stephen Toub, which is an absolute god when it comes to performant code and low level programming.

So, it was not a random "X expert." Which leads me to put this into the "don't try this at home" category.

3. The $120k cost seems something out of this world for most small and mid-size companies.

When it comes to token costs, I think it's always a matter of financial context. I'm quite sure that this port generates enough ROI to make the token cost negligible.

The learning point here is that we always need to adapt our agentic coding workflows to the value we generate with the performed work.

[Peter Morris @MrPeterLMorris]

First TypeScript compiler, now GitHub Copilot has been ported to Rust.

I am getting MASSIVE vibes that Microsoft is not taking C# seriously.

If C# isn't good enough, make it good enough!

[john smith @solrevdev]

@MrPeterLMorris @davidfowl @stephentoub It does make you feel this sometimes.

[john smith @solrevdev]

@AdamFrisby @davidfowl @stephentoub Do Microsoft actually have any production .net it’s all rust or typescript it seems?

[Peter Steinberger 🦞 @steipete]

This is brilliant. https://t.co/39dr9faUMC

[john smith @solrevdev]

Fable 5.1 and GPT-6 Astra and Daybreak Blue 🙏🏼️

[john smith @solrevdev]

Checking to see if I have GPT-6 Astra yet. Has anyone got access in the UK?

(Ignoring those who had pre-announcement access.)

[john smith @solrevdev]

this!

[Theo - t3.gg @theo]

fwiw, don't love that OpenAI "launches" aren't actually launches, and the real world availability date is an unknown amount of time down the line.

We should all be able to play with this new model together right now, feels weird that only certain people have access.

[john smith @solrevdev]

@KarenPayneMVP 1 ToList()

[john smith @solrevdev]

8 days since an incident free day at Claude
https://t.co/35EzRbQAUA

[john smith @solrevdev]

@axhiii88547 Microsoft Visual Interdev

[john smith @solrevdev]

Microsoft Visual Interdev.

It had syntax highlighting and intellisense which was magic at the time.

[john smith @solrevdev]

@RaoulGMI @AnthropicAI @claudeai 7 days since it had an incident free day https://t.co/35EzRbQAUA

[john smith @solrevdev]

Has Claude had a good day lately? No. So I built a site that answers exactly that question, with a live counter fed by https://t.co/cvlfkWdd8y's public API. The last fully incident-free day was 11 August. It's 7 days and counting. https://t.co/2MldwpPZr2