"A network process using 100% of the CPU, WiFi disconnecting at random times, and names, names (1), names (2), names (4)," wrote developer Craig Hockenberry back in May, "all caused by a crappy piece of software called discoveryd." That now infamous networking process introduced with Yosemite has been plaguing Mac owners with countless duplicate machine names, WiFi disruptions, slow wake from sleep, unreliable Bonjour registrations, and more. If that sounds like your machine, run, don't walk, to the updates tab in the App Store app because yesterday Apple dropped OS X 10.10.4, which along with a number of security fixes and iTunes 12.2, listed "Improves networking reliability" at the top of its release notes. The improvement? Apple has dropped discoveryd and rolled back to its predecessor, mDNSresponder, which as Daring Fireball's John Gruber writes, could have Apple closing "over 300 radars with this move. Not dupes — 300 discrete radars." Network Stability. Enjoy.