I suggest that you instead try to make calibre faster. I would hate having my books organized in different libraries based on author. Then you loose the whole point of using calibre: To be able browse your books at random and find something to read that you didn't know you were looking for.
Instead try to consolidate into fewer libraries.
I have my titles in only three main libraries. Fiction, non-fiction and periodicals. Also I have one for incoming and one for data sheets, documentation and manuals.
Get a faster computer. Compact the database. More memory. Use a RAM-disk. Remove all calculated or dynamic fields. Disable antivirus. An SSD.
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