Run the autofixer: https://server.hostname.tld:2087/scripts/autorepair_fix_shebangs
Simply go to Firewall config file /etc/csf/csf.conf And Disable IPV6 Restart the CSF.
Your server is extremely slow, hardly resolving, takes ages to load? Increase the MTU (Maximum Transmission Units) value. in other words: Increase the amount of data the server send in one burst. Note: Most chances is that you have to contact your service provider support to help you with this issue.