i was making a world for me to mess around in singleplayer. I stumbled across this bug by flying around.
How to reproduce:
1. use seed -5749041726318035462
2. Click the option "Large Biomes"
3. Create the world
4. Head south (f3)
Environment
Windows 7 Acer aspire 5253 laptop, runs smooth with no problem.
Java is up-to-date i believe.
an additional note, i'm using a texture pack.