If you are experiencing slow DNS in Fedora, here is a great workaround instead of disabling IPV6. Just add options single-request
to /etc/resolv.conf if you are running 'network'
Edit this file
Add options single-request to bottom of file and save
If you are running 'NetworkManager' and know how to add options to /etc/resolv.conf when it gets built post the steps below and I will add them here.