I’m not going to be much help, probably more the bearer of bad news.
Laptops work differently than PCs do. Even though there’s an additional graphics card, the integrated graphics card still works as the “pass through” for all video back to the main desktop UI from the dGPU. This is the job of the DWM process, in charge of drawing what’s on the screen.
The reason why MSFS is different, is that those pop outs are basically web browsers. As to why they climb up in utilization, my guess it has something to do with the way MSFS wrote (or borrowed) the HTML rendering code.
I’m on a gaming laptop and see these issues too. The only advice I can give is to use third party simmconnect apps to show whatever you want to see.
Edit to add, I don’t there’s a way to have a non-MSFS based interface into ATC. ■■■■.