in 1.4.7 and all snapshots up to 13w05a, I get 80-90 FPS with smooth lighting on. in all snapshots after 13w05a, my framerate is at 20-25 FPS with smooth lighting on and extremely squirrely. idk how to explain that part. i have found other bug reports similar to this, but noone has ever found the exact reason for the massive framerate drop. i have found that it is an issue with the new lighting engine as whenever i turn smooth lighting off on any of the newer snapshots, my framerate shoots back up to 80-90 FPS.
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Duplicate of MC-8824, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.
you should really read the description before ignoring my post. i know about the others. they dont have the reason why the framerate sucks in the new snapshots
mine does.
Your issue: "whenever i turn smooth lighting off on any of the newer snapshots, my framerate shoots back up to 80-90 FPS."
MC-8824: FPS Drop due to Smooth Lighting.