Why does oracle connection opens so slow on mac os sierra?
In my case, When I followed the link you mentioned in the question, and in particular when I changed the first line of my /etc/hosts of my mac from:
127.0.0.1 localhostto:
127.0.0.1 localhost Muhammads-MacBook-Pro.localWhere Muhammads-MacBook-Pro.local is the output of the command hostname
Then it worked fine.