Lossless Crop Speed (inexplicably slow)

[meteorquake]

When I losslessly crop a jpeg, the jpegcrop.exe tool is very fast (though its interface is clunky). By contrast, xnview is unexpectedly slow, even on ideal boundaries, although I reckon it used to be much faster.
I wonder if there's any way to improve this as you feel the speed difference, or is there an insurmountable reason for this?
David

[stew11]

But XnView simply used to be faster! Version 1.9.5 crops almost instantly. From 1.9.6 it takes a while longer (noticeably)... Why? I ofen use this feature, so I downgraded to 1.9.5 for now.