Content Unit Unassociation progress reporting is highly non-granular
If you sync a large number of units, then do another mirror sync against a different remote, the task will "apparently" hang for several minutes with no progress being made while it processes content unit unassociations. The progress value is only updated at the end of the process (hence, the end of the task), with no intermittent updates to inform the user of progress.
In my case, with 20,000 units being unassociated, this took nearly half an hour and resulted in believing I was looking at a problem with the tasking system.
Along these lines, content unassociation seemed much slower than association, exacerbating the problem. Perhaps we should investigate unassociation performance.
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