@nebulaeted Maybe I am misunderstanding . All I can say is, my system has 2 monitors, one runs at 240hz and other at 72hz and I don't see any slow downs of the way you describe. I have an Nvidia card, you have AMD I believe so I still think it is a video driver issue , not an opera issue, as you also say it is an issue that happens on all. But maybe I'm wrong It wont be the first or last time.
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