When I used Contabo I had to harden this aspect immediately. Stopped root logins and passwords and made a separate user with a key. Its a really bad default setup from a security point of view.
I had issues with performance as well. I could never explain why I couldn't utilise the bandwidth fully it would only work in very short bursts and very quickly was throttling the connection. The problem is the workload I had I needed that peak bandwidth once every 2 weeks for a day and then it would mostly be idle and all of the usage was outside of peak but still the bandwidth got throttled consistently and I moved to netcup.
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