When playing 18w09, a MacBookPro runs considerably hotter than 1.12 does. After only a few minutes, the fans are running at full speed, battery is consumed very quickly.
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@maggstrom It does not appear to be related to any visible feature. I checked the CPU in Activity Monitor and the four cores are not busy. I suspect it's the GPU. It happens even when there is nothing moving on the screen – no mobs, bubbles. I'm not even moving the character/camera. There are clouds, but that's it.
Does this happen when going near bubble columns? The particles cause a lot of performance issues recently.