Two things: First, I'm taking advantage of the Connectivity features of Yosemite and iOS 8 to type this via my T-mobile cellular connection. Other than T-mobile's Nanny settings on certain sites, it works about as well as my home connection (20 Mbps down, 3 Mbps up, very close to my AT&T U-verse's 24 Mbps/2Mbps benchmark). If I was in an LTE zone I bet it would be even better.
Second, I heard on this week's MacBreak on TWiT that a Bonjour Poisoning bug was uncovered in previous versions of Yosemite that can cause issues with other Apple devices on your LAN, like Macs and Apple TVs, to tag a "(2)" or "(3)" to their names. For example, when I go to AirPlay, I see "Family Room Airport (2)", "Family Room Apple TV (2)", and "Sony Apple TV (3)". The confusion is supposed fixed in OS X 10.10.3, but you have to make your entire Apple universe go dark for five to ten minutes to let the Bonjour caches clear. That means powering down all your iPhones, iPod Touches, AirPorts, Apple TVs, Macs, and any other devices (printers, FAXes, PCs) that have Bonjour enabled.
In my case I would pull the Mains breaker and shut off the UPSes, then bring everything back on-line.