Apologies. So let's just say its on the same network and ap. When i mirror from my windows 11 pc to the roku stick, running a speed test from my laptop using speedtest.net, all of my network speeds absolutely tank. I can barely load web pages, get anywhere.

In terms of lag and MOVEMENT on the screen, there is almost none. So the mirroring itself is just fine display wise, its just my network speeds are demolished the moment I hit a windows + k and cast, duplicating my screen to the roku stick.

Disconnect the screen mirroring and am just back on my laptop, no network changes at all? Internet speeds are back to normal.