Cronus900 The only one who ran 4k - Spiderman Across the Universe - is not lag until the middle of the movie, then started podlagivaet I put fullhd version of it, I think here it was the hard drive because it is sufficiently warmed up after that.
Application of the market and put YouTube, normal flight, but puts an awfully long time, the rest of the questions asked.
Still there is the remote app, but somehow could not normally skonnektit it on all your devices, probably due to the fact that it is connected to iPhone.
In general, until he found a convenient way to watch 4K, so I shake in fullhd