I went to The End for the first time today, offline. I finally add all of the Eye of Ender to the frame of the End Portal, and I enter.
Holy shit, the frame rate was so low, I would move on step and then warp off the obsidian platform to my immediate death.
If you wanna know what I'm talking about, just fire the game up for yourself and go to The End. I hope it isn't only me.
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I didn't notice any frame rate drops. Only problem I saw was that the Ender Dragon gets stuck when he flies by the generated exit portal.