If you are experiencing this issue after upgrading to 1.9, but did not for older versions of the game, the following instructions may solve the issue:
- Increase allocated RAM from 1GB to 2GB (only applicable to 64 bit users)
- In the Edit Profile menu in the Launcher, check the JVM Arguments box, and change the -Xmx1G argument to -Xmx2G
- Change Video Settings in-game (Options -> Video Settings)
- Enable VSync
- Enable VBOs
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