Today, Apple release OS X 10.10.4 along with the launch of Apple Music. This release include networking fixes since Apple replace dicoveryd with the old mDNSResponder. Discoveryd caused some trouble since Yosemite is released such as memory leak, CPU hogging and wifi dropping. Go update.

Meanwhile from Daring Fireball:

At WWDC, word on the street was that Apple closed over 300 radars with this move. Not dupes — 300 discrete radars.