Name: 1 x Online chunk loader (SF4)
Price: 4.99 AUD

Personal chunk loaders keep a single chunk loaded into memory, even when you're not standing in that particular chunk. To activate a loader, place an Iron Block inside the chunk you want to keep loaded, and right-click it with a Blaze Rod.

You can acquire up to 15 Chunk Loaders in total (four of which are provided to you for free), and are encouraged to distribute your base across several to help with performance.