Multi-monitor mostly works fine for me in Windows 11, but I do have consistent issues when dragging windows between displays with different dpi scaling. They have the same resolution but the dpi scaling on the laptop display doesn't match that on the two 27" displays next to it.

Adobe Acrobat in particular takes multiple seconds to drag a window from the laptop screen to one of the attached displays when a PDF is open. Now, this is on a 6 year old laptop due to be replaced, but it was fairly high spec when it was purchased (64 GB, RTX 2060, NVMe SSD). It really shouldn't be making me wait on 2d rendering of a document.