Video is lying while playing?

I have had it for a long time that certain games like mw warzone or fortnite have the Yt video on my 2nd screen. I have a gtx 1660ti and an i5 9400f. The games run perfectly but the video starts to stutter. I also tried whether it changes when the game is made on full screen or frameless, but no difference

Is it possibly your Internet

Have a 400k line with 12mb upload

Useless. Those who do not check and control can assert a lot when the day is long.

What Please?

If you have no idea you should get to know this

https://de.wikipedia.org/...Traceroute

Just change the resolution of the video to 480p, that's HDreddy and uses about a quarter of the data volume as HD resolution. The audio quality is the same at 360p or 240p which uses even less data volume in the WLAN.

Just click on the icon in the YouTube video screen at the bottom right and set to resolution, but you know that for sure where to find it on your system.

Then there should be no more problems with it.