For those of you who are using the new API to make a module and attempt to load it, you will know how it's not possible to get the MapCache directly. I have fixed that error as well as an NPE when loading in an external module.

As a side note, if your server suffers from lag when rendering/loading chunks, change the map-load-speed in the main config to 3 instead of 10. This will ensure that the server is not overloaded from loading so many chunks so fast.