How to calculate the FPS of the YOLOv8s model?

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Question

Guys, how to calculate the FPS of YOLOv8s model? I run with this command line format (yolo val data=VOC.yaml split=test), and the FPS I got is very poor, I think there is something wrong，My graphics card is 3090. The results obtained by the initial model are shown in the figure below. I think there is a problem.

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