I have tested my TV's internet connection speed with speedtest.net and I see that my TV's download speed is much much slower than any other device connected using the exact same cable. My laptop reached 100 Mbps, when the TV's top speed only around 10 Mbps. Both TV and laptop were connected using the same cable. I tried to use wifi on TV and receive same results (still 100Mbps on my laptop with wifi).
I am also experiencing problems when watching movies in 4K (around 20GB) from a computer when using the Samsung Smart View App. Sometimes freezes occur - probably due to poor internet speed.