Same world, same location but different version. About 250 FPS with 1.7.4 and 60 FPS with the latest snapshot.
Same settings on both instances, no vsync.
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Got little FPS drop and it's making lag spikes. Also if you noticed "Used memory" is freaking out (8Gb allocated).
I usually get the FPS drop in every snapshot. The allocated memory stays to 100MB max and my FPS are above 200 on max settings
See also MC-36531
Do you have VSync enabled?
VSync synchronizes the frame rate to your monitor's one, so it avoids rendering glitches. Basically if it's enabled, it means that you have a 60Hz monitor, and you really won't be able to see more than 60 FPS. I suggest you to keep it enabled, because there's no difference between what you can see when it's enabled and what you can see when it's disabled.