Such a problem: when I start the video, or start the broadcast and it is displayed on the screen, not minimized, then the FPS drops 2 times in games.
For example: I turned on music on YouTube, I turn on the game, and there I have 30 fps instead of 60.
For me, it is just important that it is not minimized on the second monitor, for easier access.
My specs:
Graphics card: NVIDIA GeForce GTX 1650 Ti
Manufacturer: AMD Ryzen 5 4600H with Radeon graphics
RAM: 8 GB