Running a single player flat world, I noticed a constant high CPU load (around 140% of core cycles) from minecraft and, indeed, it couldn't keep up 20 TPS. Using the speed of items through a hopper, I measured it to be running at about 7 TPS. Upon pausing the game, the CPU load drops substantially. I used all minimal video settings including 2-chunk render distance. If I bring up the debug profiler pie chart, it changes very little when pausing the game which leads me to believe it's a server-side issue. FPS remains as good as it has always been.
If it helps, I tested the snapshots dichotomically and found that the issue appears in 14w25b.
Also tried with Java 7 and 8 for same results.
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CubeTheThird
Please include a crash report from 14w30c or most recent snapshot.
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Added 14w30c forced crash report
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I noticed this is only an issue on superflat worlds of the Classic Flat and Bottomless Pit presets. I guess it has something to do with having a lot of open area near the bottom of the world.
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Improved performance in 14w32a, but still an issue. It runs at 13-16 ticks per second now on certain superflats.
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Also happens to me. I uploaded an image of this problem on snapshot 14w34c with task manager.
kumasasa
Related to - if not duplicate - of MC-58120
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Affects also 14w34c.
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Not happening anymore on Pre-release, fixed. (But still 5%/10% higher than normal/1.7.X)
kumasasa
Most probably caused by MC-58120
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Somehow returned to me and this time keeps causing lagspikes. http://i.imgur.com/6qM8Nuo.png