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This feature is exclusive to Java Edition.
The optimize world screen.
A world being optimized.
The optimize world screen is a game menu that is used to upgrade the level data of a world to the latest format. If the player optimizes a world, it is no longer compatible with previous versions of the game. Also, player scoreboard from datapack( at least), player advancements is erased.
Options[]
- Erase cached data
- Cached data for the world is erased. This includes light levels and biomes, among other things.[more information needed]
- Create backup and load
- Creates an unoptimized backup of the world, and then proceeds with optimizing the original one.
- I know what I'm doing!
- Optimizes the world without creating a backup.
History[]
| Java Edition | ||
|---|---|---|
| 16 July, 2018 |  Dinnerbone mentions possible addition of optimize world screen and shows early version of it. | |
| 1.13 | pre10 |  Added optimize world screen. |
| release |  Added information about upgraded, skipped and total number of chunks. | |
| 1.20 | Pre-release 1 | Changed background texture. |
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| Miscellaneous |