After upgrade from 6.7.3 to 6.8.x version (Pro), all API requests requiring configuration reload slowed down to unbearable point (several minutes for creating repo).
Once determining root cause of the issues, we've noticed it happened every time when configuration reload was necessary (settings changes, repository creation, etc.) and right after
and between info message about saving the configuration there was large amount of warnings
The environment we're running is behind firewall and doesn't have direct access to the internet, so all remote repositories are configured through proxy. As the DNS server in the environment tried to resolve such addresses (ending with SERVFAIL), but taking some amount of time before timeout (for example 7 seconds), the total amount of time the action took was 7 seconds * number of all configured remote repositories.
In my opinion, Artifactory should not try to resolve any URL addresses of remote repositories, if they are configured with proxy, as it behaved correctly before 6.8.x version.