GPU Priority on Multi-Resulotion dual Monitor setup

Currently I'm runnin 2 monitors on a Win 11 device. Previously I've never had a problem running multiple full screen applications with GPU acceleration.

However, following the purchase of a 1440P monitor and Win 11 upgrade this appears to be breaking. When I am watching content on the second screen (whilst having the application on the main screen at the "front") the content lags, is jittery or otherwise appears to not be performant. This includes streaming at 1080p, which should be a straightforward background task.

OS Build: 26100.4946
RTX 3070
AMD 3700x
16Gb RAM

What I think is happening, is that Windows has decided to de-prioritise GPU acceleration for background tasks (i.e. not the "main" window) and therefore performance is suffering. Any ideas how I might fix this?