iOS 9 follows OS X in dropping discoveryd for mDNSResponder to improve network stability
When OS X 10.10.4 betas dropped discoveryd a couple of weeks ago before iOS 9 and OS X 10.11 were announced, there was some speculation about whether it was just a temporary intermediate fix until Apple reworks discoveryd for the next generation operating systems. Using Xcode’s Instruments developer tools for iOS and Activity Monitor on the Mac, we can confirm that Apple has also dropped discoveryd on iOS 9 and OS X 10.11 El Capitan.