Xcode 26 + iOS 26 debugging is extremely slow

Developer Tools & Services Xcode
X_Sheep OP
Created 2w
Replies 7
Boosts 6
Views 312
Participants 7

Since upgrading my iPhone 13 Pro Max to iOS 26, apps have become nearly impossible to debug. The recent update to iOS 26.1 has made this even worse.

Going from app start to a fully rendered & responding screen takes <1 second on a Debug build when no debugger is attached, but with the debugger attached I get these times (measured manually with a stopwatch):

  • First render:
    • <1 second without debugger
    • 5 seconds on USB debugger
    • 30 seconds on wireless debugger
  • Data loaded from webserver and UI responding:
    • <1 second without debugger
    • 19 seconds on USB debugger
    • 5 minutes on wireless debugger!

Doing an online speed test reports 55 Mbps for the phone and 60 Mbps on the MacBook, so I doubt it's my WiFi.

Having a debugger attached used to make minimal difference on iOS 18, but the performance has tanked completely since the last major release. What happened?

Replies  7
Boosts  6
Views  312
Participants  7
dysonapps OP
2w

I'm seeing this too and not sure what to do about it. You're not alone. Anyone else having this issue?

OP, are you noticing a similar slowdown with ChatGPT in 26.1? It's almost unusable for me with how slow it is and I'm on an M2 Pro MBP.

1
patrick OP
2w

I have similar experience and don’t know how to fix this 😕

0
Wireboy OP
2w

I’m experiencing the ChatGPT issues as well. Code updates via Coding Intelligence that were taking 20 to 30 seconds before 26.1 are now taking 20 to 30 minutes. It has become 100% completely unusable.

0
X_Sheep OP
2w

I'm not using Coding Intelligence, so I think ChatGPT is part of an issue unrelated to this one.

1
WestonM OP
1w

I am also seeing this. Debugger is causing the app to be super slow when using a physical device. I can see sentry logs in xcode for app hangs > 6 seconds. Sometimes worse.

1
SparcGuy OP
1w

I refuse to believe they didn’t test it before, so I can only assume they don’t care. It’s crazy, but it looks like every other Xcode version ships with a broken debugger. In some versions, it works better, but then the next one arrives with a broken debugger. Beside Wi-Fi issues, the debugger sometimes gets stuck, fails to debug async code, and so on. This forum is full of debugger bugs, it makes me wonder which debugger they use to debug the internal apps.

1
EdisonB OP
3d

Just passing to say, same, and this must be battery-melting to our MacBook-wielding brethren right now now.

0
Xcode 26 &#43; iOS 26 debugging is extremely slow
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