Achraf Kassioui

Interested in technology, philosophy, and forms of life. Currently: simulation, physics, UI programming, game dev, SpriteKit, RealityKit, Apple platform.

[Achraf Kassioui @achrafkassioui]

Show your hands honor for the strange power they bring you: https://t.co/bvqWf1hLdq by Marcin Wichary.

[Achraf Kassioui @achrafkassioui]

This is very interesting and I agree that SwiftUI and in general UI frameworks are a tragic blindfold. On Apple platforms we can galaxy brain with gems like SpriteKit, and then the next step (back) i.e. Metal views and a fine tuned custom update loop.

[alexey @sekachov]

breaking news: atlas for iphone have been achieved internally. same engine, same quality, same speed. it’s fascinating how much bigger the world feels once you step outside the swiftui bubble.

[Not Alan Kay @NotAlanKay]

@msimoni We didn’t “one shot” the desktop metaphor. We built systems where we could try out zillions of experiments.

[Achraf Kassioui @achrafkassioui]

@rsms Are you using a Metal View, with the NS/UIResponder methods?

[Achraf Kassioui @achrafkassioui]

@rsms Fascinating

[Rasmus Andersson @rsms]

Finally got to ~zero input-to-display latency on macOS. It has taken us a _lot_ of work to get here!

This is a slow-motion capture of a 120 Hz screen running a playbit program that draws a rectangle where the cursor is.

The slight lag you're seeing is not from rendering latency but from "old" mouse position data (we receive it from macOS window server in a event queue.)

Remember that the mouse cursor is drawn with dedicated hardware (dedicated GPU plane) so dragging a rectangle is the ultimate input-to-display latency test.

[Achraf Kassioui @achrafkassioui]

CRT scan line shader in SpriteKit:

[Achraf Kassioui @achrafkassioui]

@0nabilbk 🙏

[Achraf Kassioui @achrafkassioui]

Shock wave shader in SpriteKit:

[Achraf Kassioui @achrafkassioui]

Why UI frameworks exist?
Why the Web DOM, why SwiftUI?

Why aren't buttons, lists, media viewers, and other UI primitives arrangements on top of the same low-level update loop that every programmer could access?

[riveo @RiveoApp]

After 6 years, 200+ effects and 250+ updates Riveo is bowing out. Thanks everyone for being part of this!
https://t.co/0mqGagLY5U

[Achraf Kassioui @achrafkassioui]

How can I help improve the writing and didactic style of Codex with 5.5 @ChatGPTapp @OpenAI ? It's very bad at explaining and communicating. Sonnet/Claude do much better. But I'd rather keep using Codex for the price and the app.

[Achraf Kassioui @achrafkassioui]

My Apple conspiracy theory is that technologies that teach universal transferable skills (SpriteKit, GLSL) got neglected in favor of opaque, non-transferable ones like SwiftUI.

[Achraf Kassioui @achrafkassioui]

macOS 27, now do the scrollbars!

A little Aquafication so they're actually glanceable again, and we're back in business.

[Achraf Kassioui @achrafkassioui]

I want to see how people vibe code and loop code. Not tutorials. But full session recordings.

Who has video links?

[Achraf Kassioui @achrafkassioui]

Link: https://t.co/WbF2eWrqJ8

[Achraf Kassioui @achrafkassioui]

For WWDC 2026, Apple held a developer forum event where Apple engineers answer questions about game technologies. I asked about SpriteKit Continued Support. This was Apple's answer:

[Achraf Kassioui @achrafkassioui]

An online Q&A session on Games Technologies will start today at 10PM GMT: https://t.co/vvLTtcbnRk

[Achraf Kassioui @achrafkassioui]

There are plenty of hiccups in the beta version of macOS 27, but I'm never going back to [expletive] Tahoe.

[Achraf Kassioui @achrafkassioui]

I've always been fascinated by how people work. How programmers work. How researchers work.

Now I want the same for people doing "agentic coding from the terminal."

Who is writing the "AI Coding Phenomenology"?