Board Thread:Questions and Answers/@comment-28930247-20160728041235/@comment-30837385-20170930121840

I'd assume that a better way of putting it is the number of "items" (Blueprints, Wood, Planks, Loose items etc.) that the game has to load when you ask it to. Therefore as the Data Size increases, it takes more time to load and may produce more lag as a result. My data size is around 8 right now and it takes about 1-2 mins to load up and it causes a little bit of lag.

Also, by theory, having fewer blocks (i.e. one Large Floor instead of two Walls) will reduce the data size but I cannot be sure of this. Someone may have to do some experiments.