Zach

[Zach @hizachlee]

Same site, same CDN. I swapped Nuxt 4 for SolidStart and mobile PageSpeed went from 70 to 99, with 0 ms TBT.

No amount of Cloudflare tuning could buy those 29 points. The framework swap could.

Full writeup, including the two places I still run React ↓

[Zach @hizachlee]

Full writeup: https://t.co/S6AlzQ5KD5

Receipt attached. Lab data, single site, full boundaries in the post.

[Zach @hizachlee]

Same site, same CDN. I swapped Nuxt 4 for SolidStart and mobile PageSpeed went from 70 to 99, with 0 ms TBT.

No amount of Cloudflare tuning could buy those 29 points. The framework swap could.

Full writeup, including the two places I still run React ↓

[Zach @hizachlee]

Used it to ship the 1.0 I'd abandoned for two years — one 130-file PR, keypress path 27–38× faster. 👇
https://t.co/i3AuFtFZTV

[OpenAI @OpenAI]

Sol, Terra, and Luna, our GPT‑5.6 family of models, are starting to roll out now in ChatGPT, Codex, and the API.

[Zach @hizachlee]

KeyEcho 1.0:

• free & open source (<5 MB, no account)
• signed + notarized builds — antivirus false-positive era ends
• paid studio Lab Packs — you vote what gets recorded first

No download needed — open https://t.co/IP3uHl2fLW and just type.
Write-up: https://t.co/wtpPFmVnc4

[Zach @hizachlee]

One personal take:

Claude Fable feels like a talented engineer who thinks outside the box — ideas, angles, things I missed.
GPT-5.6 is simply the best executor right now — near-perfect implementation.

My workflow: Fable thinks, 5.6 builds, I decide.

[Zach @hizachlee]

Why Rust is my first choice in the AI era:

Performance is table stakes. The strict compiler is the real asset — the borrow checker is the first referee for AI-generated code. Bad code doesn't survive cargo check.

The more the copilot writes, the more that guardrail is worth.

[Zach @hizachlee]

The speedup comes from the refactor itself — predecode, shared buffers, no lock, bounded queue.

What GPT-5.6 did: it made finding, doing, and verifying that refactor fast enough to actually happen.

Copilot, not autopilot.

[Zach @hizachlee]

The core is a rebuilt audio hot path (Rust + Tauri):

Old keypress: OGG decode + sample copy, behind a global lock.
New keypress: one event → bounded queue → clone one Arc&lt;[f32]&gt; handle.

1184 ns → 43.5 ns. Zero copies. Every keystroke.

Reproduce it: pnpm run bench:audio

[Zach @hizachlee]

GPT-5.6 Sol launched today.

My open-source app — 800+ stars, untouched for two years — just shipped its 1.0 with it: one 130-file PR, and a keypress path that's 27–38× faster with zero copies.

Two years of putting it off. Done in a day. 🧵

[Zach @hizachlee]

Sent a reactivation email to a newsletter that went silent for over a year — ~18,000 people, all on my own self-hosted stack.

0 spam complaints, 99.9% delivered.

"Dead list" usually means you stopped showing up — not that they hate you.

[Zach @hizachlee]

Ran a review-history miner on our own team repos today.

Merged PRs: plenty. Review comments: zero.

Fast-moving AI-native teams don't write review threads anymore — the team's judgment now lives in CLAUDE.md files and mid-session corrections to agents. Interesting shift.

[Zach @hizachlee]

Went quiet for over a year. Today I relaunched my newsletter — and I run the whole thing myself: self-hosted list, my own sending stack, no Substack, no beehiiv.

First send landed clean: 0 spam complaints, ~27% opens, real replies already coming in.

Building the rest in public.