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Unmined test results for a large Minecraft world

Unmined was updating map of a huge world while I was writing the post on the same machine. CPU usage was around 70-80% according to Windows Task Manager and 320 MB of RAM were allocated. User interface elements were responsible, map was scrollable and fast, hard disk was working hard.

World properties:

  • 20000 x 20000 blocks
  • 9.66 GB folder size
  • 1600 regions (40 x 40)
  • map seed is 1758000052

World has been generated using Minecraft Land Generator. It’s a huge ocean, omg. Every single pixel representing one chunk (16 x 16 blocks) on this image, magnified area is 512 x 512 blocks wide and contains 1 pixel per block.


  • 70 minutes map update time when opened first time
  • 86 seconds map update time when reopened after playing and rebooting (without reboot it’s only 3 seconds because of OS disk cache)
  • 61 seconds image rendering time (20480 x 20480 pixels, BMP, 1.6 GB)
  • 367 MB cache folder size
  • PNG export failed, BMP works

Test machine has Intel Core i5 2500 CPU with 4 cores, 4 GB RAM, 2 TB SATA hard drive spinning at 7200 RPM and Windows 7 64 bit.

Live map

New release is available for download.

What’s new in v0.2.115:

  • (New) Live map

Live map feature of Unmined updates visible region of map immediately when Minecraft saves chunk data. This happens periodically while playing, and can be forced by entering the game menu for a few seconds (press ESC).

Unmined 0.2 for Minecraft 1.2.5

New preview version of Unmined is available for download.

In the past few months I had to fix a bug in the runtime library of Delphi and restructure entire code of Unmined because of an internal error in the compiler.

What’s new in v0.2.108:

  • Anvil file format (Minecraft 1.2+)
What’s planned for next releases:
Screenshot of the new Jungle biome: