• A mod that try to reduce the size of region.
• It only save what cannot be generated by seed like what player put/break, block entity...
• And still use .mca format
• Support multi-mod environment like most of optimization mods, aether, aoa3but doesn't compatible with The Twilight Forest
• use commands to add or remove what should save
• also has enchantments to use similar effect of following commands

/deltachunk add x1 y1 z1 x2 y2 z2  
/deltachunk delete x1 y1 z2 x2 y2 z2

Warning

Backup your world before add this mod and use above commands to make sure your house in a old world would be saved.(only old world need that because my mod don't known these blocks are put by player or generator before you put/break them)

• no-recommand to multi-player server because of protential bugs and using cpu resource to exchange region size is not cost-effective
• It is important to save your portal with break/put a blcok around the portal, /deltachunk add or any item with delta addenchantment after entering an new dimension