Game laggy, stuttering, freezing on on lowest settings even with a decent PC?

I've got a decent computer, 2070 and a newish CPU, as well fiber optic Internet. My PC is connected to the wifi/router via a cable too.

And yet, whenever i play BR, Brick Life, etc with my 7 y.o. who's on his Ps4 (connected to the Internet via wifi), he'll load our games immediately while I'm stick in the loading screen, and my character will be dead before i get off my loading screen.

Or if i do get out of the loading screen, the game stutters and freezes to much to be playable.

I know its not the internet, as I've checked it with multiple speed testers and there's been no issues, and him and I are the only ones in the house.

If we're playing games solo separately, his will still load faster and never freezes or anything either.

Even if i use the lowest graphics settings im the options, it still occurs.

Even when I'm spectating other players after being killed, it's still stutters and freezes up.

By comparison, if I drop into a game of destiny or some other multiplayer game, I don't have any issues whatsoever.

The game is literally unplayable for me, what's going on?