[Mythlandia]

I have a number of different Calibre libraries which I swap between.
Every few times I swap libraries Calibre will decide to reload info from the directories & metadata (at least it reads thousands of files). This takes ten minutes to an hour depending upon the size of the library. Sometimes I will lose patience, kill Calibre, go back in and the same library opens immediately.

Is there anyway to get Calibre just to trust it's own data?

The 45mb metadata database could be read in less than a second, but the actual library is 65gb and just touching the metadata files means reading gigabytes of data.