There is a good margin for improvement, the server feels and plays smoothly. The first changes I'd implement are a more intuitive and readable UI (i.e., when using /commands) and improving the new-players onboarding experience.
Let me elaborate further: upon joining the server, new players do not really know what to do or where to go (even renting vehicles or getting to know that you have to type /dmv to find where the DMV school is feels bad and counter intuitive). New players are what makes the server flourish, and focusing on their experience is crucial to keeping a healthy playerbase and increasing the overall retention.
We have just launched, but these are the main areas I'd focus my efforts on.