Significant delay in processing camera video streams

[leelightning]

When I process the camera video stream, the frame rate is high, but the program has a noticeable delay (about 1s)Why is this?
When I comment out testPool.get(img), there is no delay (that's for sure), so there should be a delay in taking the image out of the thread pool

[Qengineering]

The example was never intended to use with a camera.
Usually, cameras run at 30 FPS tops, a rate most NPU models can handle in a single thread.