Paul Samuels:
My approach when needing to figure out what an old regex was doing was to paste it into whatever the top search result for “Explain regular expression” was.
Something that I’ve been doing for a while but hadn’t really thought about was using Xcode’s Refactor > Convert to Regex Builder as a way to explain a regular expression without having data leave my machine.
Yes, it’s a shocker but one of Xcode’s refactoring tools actually works for me.
It works surprisingly well and as a bonus gets those endorphins flowing knowing that my data is safe from some AI drivel.
[…]
Depending on your level of experience with regex you might think this is actually more wordy/overkill (in this case I’d agree) but the point is each part of the regex is broken out into smaller parts that have names explaining what they are doing.
And you can manipulate it using Code Folding.
Previously:
Mac macOS Tahoe 26 Programming Regular Expression Swift Programming Language Xcode
ToxicLand (via Hacker News):
Using an M1 Max MacBook Pro, having Electron-based apps open / not minimized causes a huge lag.
CPU and GPU usage remains low, but if I have Discord and VS Code open, moving windows, scrolling is stuttery. It happens even when only Discord is open but it gets worse if I open a second Electron app.
This is kind of weird because while having Discord open and I’m in Chrome, the lag still occurs, but it’s fixed if I minimize.
avarayr:
After a lot of digging, I believe I’ve found the root cause of the WindowServer GPU spike on macOS 26 when shadows are enabled.
It turns out Electron was overriding a private AppKit API (_cornerMask) to apply custom corner masks to vibrant views.
This method is called by WindowServer to calculate the shadow of the window. I’m speculating that Apple uses some sort of memoization by reference, and this method breaks the memoization and forces WindowServer to repeatedly recalculate and repaint the shadow.
🤔 What’s particularly funny is that even a simple override that does nothing but call super still presents the issue.
Previously:
Update (2025-10-01): Tomas Kafka:
This script detects apps with not yet updated versions of Electron.
See also: Hacker News.
Update (2025-10-06): shamelectron (via Hacker News):
Tracking problematic Electron apps macOS Tahoe.
Craig Hockenberry:
I took that script, updated some parts that required Xcode to be installed, and wrapped it up in an Apple Script applet that’s easy to download and run[…]
[…]
We’re hearing from customers that some of our apps are running slowly on Tahoe and I suspect that this bug has something to do with it.
Update (2025-10-14): Michael Burkhardt:
Now, the Electron team has fixed the issue, and said fix is beginning to roll out in popular third party apps that utilize the framework.
[…]
There are also a lot of major apps that haven’t yet updated their Electron version, including 1Password, Bitwarden, Cursor, Dropbox, Windsurf, and more. You can check out the tracker for a more comprehensive list.
Update (2025-10-21): John Gruber (Mastodon):
So, yes, Theo Browne, “software dev nerd”, Electron really is “that bad”. It’s actually, if anything, worse.
Paul McGrane:
My main Mac is still not on Tahoe and judging by the linked tool, I have made a wise choice.
Should we expect Apple to quietly address it in the next Tahoe update, or leave the bad apps in the wind? Especially since DropBox is an offender, that must be installed on nearly everybody’s Mac even if they don’t primarily use it!
Cocoa Cursor Discord Dropbox Electron Mac macOS Tahoe 26 Private API Visual Studio Code
