I have dual monitors, one is 144hz and the other is 60hz because the monitor is old. While playing games on the 144 hz monitor, I watch video on the other monitor and experience fps drops, my video card is 6500 xt, can you help with this issue?
Try Stop watching videos and see if you still are having the fps drops.
If that helps. then you'll just have to lower the resolution/quality of your gameplay so your gpu can keep up. You can also try adjusting the fancurve of your gpu to keep your card cooler under load. Hope that helps.