I didn't have the global-messages-db.sqlite-journal file; I did have global-messages-db.sqlite having ~400 MB.
After removing global-messages-db.sqlite and starting Thunderbird, it created new global-messages-db.sqlite and global-messages-db.sqlite-journal files.
Thunderbird CPU usage didn't go down; it's still constantly 50%-100% CPU usage.
I didn't have the global- messages- db.sqlite- journal file; I did have global- messages- db.sqlite having ~400 MB.
After removing global- messages- db.sqlite and starting Thunderbird, it created new global- messages- db.sqlite and global- messages- db.sqlite- journal files.
Thunderbird CPU usage didn't go down; it's still constantly 50%-100% CPU usage.