ios - How to profile DispatchQueue performance? -


i have ios app has used dispatchqueue in multiple places , experiencing performance issues: when app first starts, fps quite high, after while fps drops singe digit.

it seems there performance issue related dispatchqueue usage. evidenced warning messages gcd performance issue warnings in instruments when trying profiling template time profiler.

what common approach find dispatchqueue task taking large resource? (i.e. instruments template use?)

i using swift 3, xcode 9.3 (beta), , instruments 9.0


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