Low FPS when using two monitors

Hi! Here is my problem. For some reason, when I drag any window to the second monitor, my fps drops dramatically. from 120 to 8 or 6. It doesn’t matter which window it is. Second viewport, or sequencer window or content library. Fps just falls catastrophically. And it doesn’t matter what level I open at the moment. It can be a completely covered map, or just an open empty level. The same thing happens. As soon as any window appears on the second monitor, fps drops from 100-120 to 8-6. Please help.

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Drivers latest, I use two cards and both monitors works from different cards. Maybe it’s a hardware, but it started only today. I dont have this problem before. What it can be?

Monitor mode ? Drivers? How many cards you use? Two? Monitors are bound to each other card? Seems that it is rather hardware problem.

Here is my example. All running on two monitors and one card. Try rearrange, for test purpose, your setup. Just one card and two monitors.