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Hello, @tomsymonds
What you can do is to monitor the performance of the droplet and see if there are some other processes that are consuming CPU and memory as well. I will suggest you to check on this article:
https://www.digitalocean.com/community/tutorials/how-to-monitor-cpu-use-on-digitalocean-droplets
This can help you to optimize the performance on the server and make the overall experience better.
As for some Jamulus alternatives, I’m afraid there are not many which can be close to the same setup but you can check out Jam Link as well.
Regards, Alex