Hi Mike, Ah ok, now I see, you seem right, the destination raster is first written with background color (which when using LZW compression of the size of the destination raster is very small pixels with same color can easily be compressed). So using the size of the raster to evaluate the progress is not possible thus, even more when the destination data is uncompressed. I let a 23 GB uncompressed export run till the end and it takes about 7 hours. I am not sure why the performance bottleneck is so I have entered Defect 114991. Thanks, Mathieu
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