It's not so much (smooth) movement. It's when the progress bar zooms from 0% to 96% relatively quickly, but then it just sits at 97% for an ten or twenty minutes!  It's the fact that the wait time is <i>massively disproportionate</i> to the rest of the progress time that's the issue.  Is there something happening?  Has it crashed?  Shall I "turn it off and on again"?