Spin fps on laptop, why?

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When I start a certain game on my laptop, it runs continuously at 10-20 fps. That at the highest settings. When I go to the task manager, the PC is at 10% capacity. The priority is set to real time that so?

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What is 10% busy? The CPU, the graphics card, the RAM, …

On

Is your laptop running on battery power? Many devices do not get the maximum performance, especially the graphics card.

Connect the device to the mains, select maximum performance in the energy options and try again.