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It appears that color coloring of columns based upon formats has the same bad effect as a custom column using formats. However, it appears (not proven) that when you start calibre it assumes the metadatabase is correct (at least some of the time) and does not force a recheck of the directories, thus when you abort and restart calibre it goes in quickly without a check of the directories; when you do a quick switch of libraries, it appears that directories are then sometimes (not always) forced to be rechecked.
The good news is that in the few minutes since I turned off column coloring, all the library switches have been measured in seconds, not minutes.
The bad news is that my library isn't as pretty...
Thanks theducks, PeterT and DoctorOhh for your help in solving this for me.
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