Without any information about the hardware you are using it is difficult
to give you an estimation. Which CPU ? How much cores ? Is a GPU
available, if so : which GPU / Graphics Card ? Have you OpenCL enabled
in dt settings ?
For comparison : on my system (CPU with 6 cores, Hyperthreading), Nvidia
RTX 2060, OpenCL enabled the overall CPU load is about 5%, GPU load
about 8% when moving the crop area around.
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