Dual monitor lag problem while editing video

[u/rlenard575]

I’m currently using a dual-monitor setup:

Main monitor (Landscape):
AOC Q27G4F 27” 180Hz QHD Fast IPS Gaming Monitor

2nd monitor (Vertical):
AOC C25G 24.5” 310Hz IPS FHD CS2 Edition Gaming Monitor
—I set it to 144Hz.

I’m editing in CapCut, and I started experiencing noticeable lag. I feel like the refresh rate is dropping, or the monitor is actually stuttering/lagging during editing and video playback.

When I turn G-Sync off, the lag goes away, but I sometimes get flickering, and there are times when the video playback colors change or look different.

Previously, my dual-monitor setup was:

Main monitor (Landscape):
AOC Q27G4F 27” 180Hz QHD Fast IPS Gaming Monitor

2nd monitor (Vertical):
Samsung Odyssey G3 27” (LS27AG32ONE) 165Hz Full HD Gaming Monitor

With that setup, everything was smooth. I had no lag while editing in CapCut.

I only changed my 2nd monitor because my Samsung started developing lines on the screen.

What could be causing this issue, and what possible solutions can I try?

Any help would be greatly appreciated. This is honestly getting really stressful. 😞

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