Xcode 26 beta 3 Extremely Sluggish Run on Device

Developer Tools & Services Xcode
maxretik OP
Created Jul ’25
Replies 3
Boosts 3
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Participants 4

After updating from Xcode 16 to the new Xcode 26 beta 3, running my iOS app becomes slow to the point of unusable. It builds and installs fine, but when running with the console, it lags about 20-50x compared to building and running with Xcode 16. I wanted to try our Xcode 26 to preview my new app icon made in icon composer but now I don't think it's worth the hassle.

When running via simulator, the same performance issues. Anybody also struggling with slow on-device testing speed? I am on Sequoia 15.5.

Replies  3
Boosts  3
Views  326
Participants  4
NickYaw OP
Jul ’25

A workaround is to disable Debug executable in your scheme. Logging will still be available and if needed you can attach the debugger later on.

0
bengovernment OP
Sep ’25

I'm seeing the same issue on- Version 26.0 (17A321). Tons of frames dropping. Much worse than on Xcode 16.

1
marc.aa@coditramuntana.com OP
3w

I think a turtle in slow motion is faster than running an app on a device through Xcode 26

0
Xcode 26 beta 3 Extremely Sluggish Run on Device
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