Apple at WWDC 2026 today said it has made several responsiveness improvements across its software ecosystem, speeding up system animations, app launching, and much more.
Overall, iOS 27 so far is a major collection of performance improvements and refinements.
As had been rumored leading up to today, Apple has spent extra time this year working on bug fixes and performance improvements for iOS 27.
Although there’s no obvious connection between the Tahoe and Golden Gate names to indicate a “tock” release, Apple devoted the first chunk of the WWDC keynote to how OS 27 will address user and developer complaints about OS 26.
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Apple also made a big deal about performance improvements, smoothing system animations, launching iPhone and iPad apps up to 30% faster, displaying new photos in the Photo Library up to 70% faster, transferring files via AirDrop up to 80% faster, and moving files from an iPad to an external drive is up to 5x faster, so it compares with macOS transfer speeds. A new CPU Scheduler promises to improve iPhone performance even on older models back to the iPhone 11, which may encourage more people with older iPhones to upgrade.
There really aren’t many changes this year.
I’m way more interested in bug fixes, but optimizations and refinements are great, too. Simply limiting the number of new features creates space to improve the software quality, though, it’s not clear to me whether there are really fewer new features or if it’s just that they mostly fall under the single heading of AI.
Animations run smoother, apps launch faster, and Liquid Glass is better? It’s Glow Leopard for sure!
One underrated theme from this WWDC is Apple investing heavily in fundamentals.
Faster launches, scheduler improvements, search infrastructure, networking transitions, rendering performance…
Users notice responsiveness long before they notice most new features.
You gotta admire Apple’s ability to market “bug fixes and performance improvements” so effectively.
Please just do this every other year.
Previously:
Update (2026-06-12): David Smith:
Something I’ve noticed about performance work is that people really want there to be A Cause for improvements. A new technology, something old no longer holding things back, “removing the debug logging”, etc…
The truth of the matter is that 97% of the time the enabling thing for performance work is engineers having time in the schedule to sit down with the tools (usually a sampling profiler) and grind out small wins over and over.
There’s no magic bullet that replaces good engineering.
It sounds like the magic bullet is a reasonable release schedule. You’ve always had the power, my dear Craig. You just had to learn it for yourself.
The moment the keynote used the phrases “sweating the details” and “attention to detail,” it was clear that beyond AI and Siri features, this year is about small fixes and improvements. In more private settings, Apple folks specifically referenced Snow Leopard and iOS 12, two updates that saw Apple take a pause from huge feature roll-outs and prioritize speed and bug fixes a bit more.
But to be clear, referencing Snow Leopard does not mean “no new features.” Like Apple’s 27 releases, Snow Leopard was full of dozens, if not hundreds, of new features—they were just scattered small improvements throughout the system.
The older I get and the longer I do this development work I realize time is short and we may not get to all the things we want to do in life. So when we are forced to wait yet another year for some fixes to a framework we’ve been trying to use for several yearly cycles already it can be disappointing to say the least.
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Unlike past years there is no clear Apple mandated work. Thank god. I can focus on what I want to build without having to adopt my code to an ill conceived UI update that will be semi-discarded the following year.
Apple Software Quality iOS iOS 27 Mac Mac OS X 10.6 Snow Leopard macOS 27 Golden Gate Optimization
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