I have once again changed how the map render system works. There is a new option in the main config that disables rendering on chunk load, which should improve the server speed by quite a lot. I have also changed the /mapreload command to reload all loaded chunks. You can also delete maps with /cartographer delete <map-id>. Note that deleting the save folder will take some time, and will print a message in the console once done.

I should have also fixed various bugfixes. Note that its not possible to hide the map's zoom info pre-1.12