Is it vlc struggling or your entire PC?

I has one boss who wanted to stream 2 4K60 cctv feeds to his laptop while in the office. Needless to say his laptop struggles with a single 4K I didn't even bother setting up the second feed.

what are you watching that's uhd and high ftamerate? is is something you made? I've never heard of anything releasing like that because yeah, most people can't play that lol.