In hopes of finally addressing ongoing network-related issues in OS X Yosemite, the new 10.10.4 beta release does away with discoveryd and rolls back to mDNSResponder from OS X Mavericks. Apple replaced mDNSResponder in OS X Yosemite with discoveryd for handling certain network tasks, but that decision left many Mac owners frustrated with heavy CPU usage, slow Internet issues, and network connection problems.
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Discoveryd has been a big bag of hurt for Apple. Rolling back to mDNSResponder seems like a smart move considering just how many network-related issues Yosemite using Mac owners have been facing.