Why does ping jump on a laptop when watching a movie on a TV set via UPnP?

Question

ZyXEL

What is the problem.
There is a Zyxel Keenetic Lite 3 router, on my computer I set up a media server ( https://www.homemediaserver.ru/index.htm)
LG 42LN613V TV.
A laptop that has lags Lenovo IdeaPad Z570.
For the test, I turned on World of Tanks on the laptop, and started watching a movie on the TV via WIFI.
If without watching the movie in the tanks there was a ping of 10-20, then when watching the movie it rose to 170.
Question: Why?

Answer 1

And why in a noisy place is it hard to hear the interlocutor? Sometimes you even have to ask.