You could create a brand new library, switch to that library, then see if Calibre shuts down and restarts much faster. If you have not vacuumed/compressed your Calibre library in a long time, its metadata.db file might have grown enormously simply due to the way that SQLite works when you change metadata, and irrespective of your adding new books. Library > Library Maintenance > Check Library. Calibre will vacuum/compress it for you.
DaltonST
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