Marco Arment:

The entire decline of software quality that I felt in January wasn’t all due to a single buggy network-lookup service — but, unbeknownst to me at the time, a lot of it was. And that huge swath of problems that annoyed me every day disappeared instantly and completely as soon as I updated every computer on the network to 10.10.4.

I still have some occasional problems with AirPlay on my Apple TV (3), but my Mac is definitely more reliable with network-related tasks.