Delete old iMessages
Refer: https://www.igeeksblog.com/how-to-clear-imessages-chat-history-on-mac-os-x/
In Finder, "Go to Folder:"
~/Library/Messages
Delete the following:
chat.db
chat.db-shm
chag-.db-wal
Parallels Toolbox Deleted Font Cache
Refer: http://osxdaily.com/2015/01/08/clear-font-caches-databases-mac-os-x/
$ sudo atsutil databases -remove
Reboot your computer