I've noticed extremely slow write performance with HealthKit in 26.1. I ran the same exact code in a clean 18.6 vs 26.1 environments. The time to write the same data was seconds in 18 but took minutes in 26. I also submitted a bug report: FB20962900

I figured my issues by taking this approach: https://gist.github.com/tanmays/4213cc6f76241c5d4e4bdb6e53ce310d That left me with having to disable the new system wide swap back, which was triggering and conflicting when I dragged my chart to the right. Setting interactiveContentPopGestureRecognizer.isEnabled to false helped with that

Same problem in my app that uses a Swift Chart in a ScrollView with simultaneous gestures for long press/drag to inspect data points, etc. The same code works when building in Xcode 16 when running on iOS 26 in the simulator and real device. Compiling the same code with Xcode 26 has the vertical scroll broken when you initial the scroll on a Swift Chart that has the gestures. Are there any updates or workarounds?

Yes, I just submitted a post about it too. My build worked and showed up earlier today. I expired it and uploaded a new build 45 minutes later and it still isn't appearing after 2 hours. Apple's status dashboard s all green but it does appear they haver having a problem. I'm glad I'm not the only one.