Updated the overworld (optional, updating the overworld will change chunks slightly, though this update itself does not) reducing the mantle radius for caves / ravines (this dramatically improves memory usage)
Improved mantle region loading / unloading to reduce time and reduce the impact of possible disk thrashing
Split the cache sizes on streams / data loaders into configurable sizes (see settings.json)
RECOMMENDED: Set mantleKeepAliveSeconds to 20 seconds (if its set to 60). This will reduce memory usage if you are having problems