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Originally Posted by Adam KH
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It is slow in scrolling and opening the Metadata and especially slow at saving the metadata.
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That suggests it's a database related issue. When calibre is running the library metadata is memory resident, writes of the book folder metadata.opf (backup) files are done in a separate low priority thread (lazy writes) - if you do a bulk change that affects a 1,000 books those writes won't impact performance.
Do you have any custom columns that use file system template functions, such as formats_modtimes, formats_paths etc.
Did you try copying the Large Library database to an empty folder on another drive and then access that library via calibre - yes, it will work without the author and title folders.
BR