@BetterRed has a great point about trying the CALIBRE_OVERRIDE_DATABASE_PATH environment variable or symlink method. Do keep in mind though, that it might not yield the speed improvement you're hoping for, as BR tested it on Windows with no noticeable difference.
If you're comfortable with it, give it a shot, and remember to backup everything before proceeding. It's always a good idea to have a fallback plan.
Also, I second @Comfy.n's suggestion. The EV alpha tool seems promising for performance improvement, if you haven't given that a shot yet.
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