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arcanine | on: OpenCV 5 Is Here: The Biggest Leap in Years for Computer Vision
They really improved the performance. I tested yolov8 medium segmentation model on intel i7 11th gen cpu.

Opencv 4.11 : ~255ms Opencv 5.0.0 : ~185ms

with the same code.

bobmcnamara | parent
Intel never really improved their memory controller and busses and it shows.