XnView Software

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

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.