@ transmitthis -- this has me befuddled:
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weirdly after using cmd to open, it now only takes 19seconds, instead of 1m30. so all's good
EDIT - Hrm, that was only after repeatingly opening Calibre
After restarting Windows, Calibre takes 2 minuets to load
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Its only the first startup after a reboot with a large library, that takes a very long time.
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All my custom column/tag browser issues manifested themselves anytime a library was opened, whether when starting calibre, or when switching libraries within calibre.
If you want to test to see if it's related to your custom columns, it'll only take a few cups of tea

Use windows to make a copy of your library, switch to the copy in calibre, delete the custom columns, wait for the library metadata backup to complete* (ok, a pot of tea), then try switching libraries and closing/opening calibre.
*Look under Library Maintenance - Metadata backup status