Question Windows 10: laggy windows on one monitor ?

Oct 14, 2020
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I'm having a weird issue on Windows 10 where graphics intensive windows (games, a video playing, etc.) lag when I drag them on one monitor, but they are smooth on the other monitor. I tried swapping the HDMI cables between the two monitors, and that also changed which monitor was laggy so I assumed that it was an HDMI issue. Next time I rebooted the computer, though, the laggy monitor swapped back without me having swapped back the cables.

My computer works very fine otherwise and games perform as expected. What could be causing this, and how could I fix it?
 

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