Open Radar

 
Summary:
When I enable network debugging, Xcode basically beachballs all the time. It takes me a few minutes to make it dispatch enough clicks so I can disable network debugging again. It’s crazy how slow this is, and I own the top of the line 2017 MacBook Pro 15’ TouchBar - literally costing 5000 Euros. 

Steps to Reproduce:
Open complex project
Enable network debugging
Observe that Xcode slows to a crawl

Expected Results:
Xcode should work normally (so, beachballing < 2 seconds is acceptable and I’m used to it)

Actual Results:
My devices are all within 1 meter and WiFi is stable. Jet it seems that Xcode has connection troubles and thus triggers a device refresh. This takes around 5 seconds of pure main thread freezing time and is the same that I reported at WWDC: rdar://32626309

And by the time it’s updated, KVO triggered already another refresh, freezing it again.

Version:
9.0 9A235

Notes:
This feature is completely unusable. What’s Xcode really doing when it calls -[IDEScheme availableRunDestinations]? Why is that taking so long? Why is that refreshed so often? I did a Activity Monitor sample.