jlreyes

Re:Show HN: Claude skill for Apple Instruments performance traces (iOS... on Monday April 06, 2026 @12:26PM (#47663032)

Identifying bottlenecks is pretty generalizable. There is a distinction the skill tries to draw between targeting median FPS and P95, but from there the AI is quite good at narrowing to the relevant data.

Where the AI trips up is getting distracted by aggregate signals instead of digging deep into root causing specific frame drops, but I see humans and existing tooling getting distracted by that too.

Root causes are often context-dependent, but they tend to cluster into a handful of common issues. If you're able to enable the new swiftui instrument (from WWDC 2025), the entire attribute graph is encoded, and it can get you to the precise issue quite well.

Show HN: Claude skill for Apple Instruments performance traces (iOS/Mac)

Posted by jlreyes on Monday April 06, 2026 @12:08PM
from the show-hn dept.

https://github.com/jlreyes/instruments-analyzer

I was running into scroll performance issues with a mac app I was building a few months back and I got frustrated with the manual instrument → trace → diagnose → fix loop, so I built a way for claude to do it automatically.Instruments Analyzer exports .trace files captured programmatically or via Instruments (file → save) into DuckDB with Parquet backing, giving your agents full SQL access to...

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Re:Show HN: AirplaneMode – Simulate realistic airplane WiFi on macOS on Wednesday April 01, 2026 @03:29PM (#47605405)

Hope it helps- every time I've tried low-bandwidth simulators to create realistic testing conditions it never "feels" like it actually does in the field. That was a part of my motivation to build this. Let me know if he has any issues with it!

Re:Show HN: AirplaneMode – Simulate realistic airplane WiFi on macOS on Wednesday April 01, 2026 @01:27PM (#47603858)

Yeah, I've experienced this as well. It's frustrating. Wish I could offer a fix for that here. It is becoming more of a standard that airlines offer free wifi - e.g. United went from ~$8 low-quality service to free Starlink. So, hopefully you encounter this less often as time goes on.

Show HN: AirplaneMode – Simulate realistic airplane WiFi on macOS

Posted by jlreyes on Wednesday April 01, 2026 @01:09PM
from the show-hn dept.

https://github.com/freeze-rey/airplanemode-sim

I needed to test how my app performed on airplane WiFi and found that existing tools (Network Link Conditioner, comcast, Chrome DevTools, etc) weren't sufficient.AirplaneMode is a macOS CLI and menu bar app that uses a local MASQUE relay to provide:1. Jitter. All of the mac os network simulators I tried apply a fixed constant delay with no jitter model. Real airplane satellite WiFi follows a...

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Show HN: See when your Mac drains battery while charging

Posted by jlreyes on Monday March 09, 2026 @12:15PM
from the show-hn dept.

https://github.com/jlreyes/PowerMonitor

I was on a long flight with only USB power and didn't know if my Mac was draining faster than it charged. So I built a menu bar app - single Swift file, event-driven via IOKit, near-zero CPU. Shows live wattage and warns when your charger can't keep up. (And yes, my charger wasn’t keeping up.) Don’t be surprised by a power deficit!

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