How do you get the best performance for your hardware out of Minecraft? Share your tips, debunk the myths.

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Every week a new thread will be posted and stickied by /u/AutoModerator. Topics will usually cover things that, if posted on their own, would receive little attention and clutter up /new. By bringing these threads together, we hope everybody has a better experience. We've come up with a few topics on our own, but we'd also like feedback from you. Are there any other topics you'd like to see added to the rotation?