Trying to run a React Native app via Xcode can be very very very slow. Excruciatingly so. I often see messages saying things like Launching app is taking longer than expected. LLDB is likely reading from device memory to resolve symbols. But I see this all the time, if that's what it's doing it never finishes, and does it every time. This isn't just with one phone, its with several.
Is it possible there some fundamental conflict between Xcode and LLDB and React Native Metro trying to communicate / load / debug / whatever that slows things down to a standstill?