Could try this https://forum.plutonium.pw/topic/7154/low-fps-read-this but doubt it'll help. You're probably on a laptop (which was never meant for gaming) or just have low end GPU which can't even run a decade old game like BO2 at a decent FPS. My suggestion? Buy a new GPU, anything decent from the last decade works.
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AzizStand_1648
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