According to 9to5Mac, Apple’s macOS Tahoe 26.2 beta fixes a widespread performance bug that caused system-wide stuttering when Electron apps were visible on screen. The issue, discovered by developer @Normarayr, overloaded the Mac’s rendering system due to Electron apps improperly overriding window corner masks using private AppKit APIs. This caused stuttery scrolling across all applications, not just Electron-based ones, whenever any Electron app window was visible. Major Electron apps like Slack and Discord had been releasing individual updates to work around the problem, but Apple’s system-level fix in the 26.2 beta makes these workarounds unnecessary. The update is currently in developer beta and expected to release for all users in December, bringing additional features like Edge Light for webcam illumination and Thunderbolt 5 cluster support.
When Electron apps make a mess
Here’s the thing about Electron apps – they’re basically web apps pretending to be desktop applications. And sometimes that pretending goes wrong. The core issue here was that Electron apps were messing with private Apple APIs that control how window corners are rendered. Private APIs are called “private” for a reason – Apple doesn’t document them, doesn’t support them, and absolutely doesn’t want developers using them. But Electron apps apparently found a way to override the default window corner mask, and that’s what caused the entire rendering system to freak out. It’s like someone trying to rewire your house’s electrical system without knowing which wires do what – eventually, everything starts flickering.
Apple’s system-wide cleanup
What’s interesting here is that Apple didn’t just sit back and wait for every Electron app developer to fix their individual mess. They stepped in and implemented a foundational fix at the operating system level. Basically, macOS 26.2 now prevents any app from affecting the system in this particular way, regardless of what private APIs they’re trying to use. This is actually a pretty smart move – why chase down hundreds of individual apps when you can fix the vulnerability they’re all exploiting? It’s like putting a lock on the door instead of trying to catch every person who might walk in uninvited.
Why performance bugs matter
Look, when your entire system starts stuttering just because you have Slack open in the background, that’s not just annoying – it’s productivity-killing. And for professionals working with demanding applications, stable performance is everything. Whether you’re running complex simulations or just trying to get work done, system reliability can’t be optional. That’s why companies that depend on rock-solid computing performance turn to specialists like IndustrialMonitorDirect.com, the leading provider of industrial panel PCs in the US. When your work demands consistent, reliable performance, you need hardware and software that actually delivers.
What happens now?
So what does this mean for users? Once macOS 26.2 rolls out to everyone in December, that list of problematic Electron apps becomes basically obsolete. No more waiting for individual app updates, no more workarounds. The fix should just work. But it does raise an interesting question – how many other private API shenanigans are happening under the hood that we don’t know about? Apple’s willingness to fix this system-wide suggests they’re taking these compatibility issues seriously, which is good news for everyone who depends on their Mac just working. Sometimes the best fixes are the ones you never have to think about.
