Game previously created in version 1.8  (Runs smooth.)

[11:08:41] [Client thread/INFO]: Setting user: CheckDFX
[11:08:41] [Client thread/INFO]: (Session ID is token:406b47288f0d4a56aa7af048e83fefcf:1e081429871a4ba193b07b2b31316e8a)
[11:08:42] [Client thread/INFO]: LWJGL Version: 2.9.1
[11:08:43] [Client thread/INFO]: Reloading ResourceManager: Default
[11:08:44] [Sound Library Loader/INFO]: Starting up SoundSystem...
[11:08:44] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use
[11:08:44] [Thread-5/INFO]: Initializing LWJGL OpenAL
[11:08:44] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[11:08:44] [Thread-5/INFO]: OpenAL initialized.
[11:08:44] [Sound Library Loader/INFO]: Sound engine started
[11:08:46] [Client thread/INFO]: Created: 512x512 textures-atlas
[11:08:52] [Server thread/INFO]: Starting integrated minecraft server version 1.8
[11:08:52] [Server thread/INFO]: Generating keypair
[11:08:52] [Server thread/INFO]: Preparing start region for level 0
[11:08:53] [Server thread/INFO]: Preparing spawn area: 51%
[11:08:57] [Server thread/INFO]: CheckDFX[local:E:e8474476] logged in with entity id 1411 at (65.92500001192091, 243.0, 227.41134516118422)
[11:08:57] [Server thread/INFO]: CheckDFX joined the game
[11:08:58] [Server thread/INFO]: Changing view distance to 16, from 10
[11:08:59] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4982ms behind, skipping 99 tick(s)
[11:12:41] [Server thread/INFO]: Saving and pausing game...
[11:12:42] [Server thread/INFO]: Saving chunks for level 'Test World'/Overworld
[11:12:45] [Server thread/INFO]: Saving chunks for level 'Test World'/Nether
[11:12:45] [Server thread/INFO]: Saving chunks for level 'Test World'/The End
[11:13:32] [Server thread/INFO]: Saving and pausing game...
[11:13:32] [Server thread/INFO]: Saving chunks for level 'Test World'/Overworld
[11:13:32] [Server thread/INFO]: Saving chunks for level 'Test World'/Nether
[11:13:32] [Server thread/INFO]: Saving chunks for level 'Test World'/The End
[11:13:33] [Server thread/INFO]: Stopping server
[11:13:33] [Server thread/INFO]: Saving players
[11:13:33] [Server thread/INFO]: Saving worlds
[11:13:33] [Server thread/INFO]: Saving chunks for level 'Test World'/Overworld
[11:13:33] [Server thread/INFO]: Saving chunks for level 'Test World'/Nether
[11:13:33] [Server thread/INFO]: Saving chunks for level 'Test World'/The End
[11:13:36] [Client thread/INFO]: Stopping!
[11:13:36] [Client thread/INFO]: SoundSystem shutting down...
[11:13:36] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com





Game previously created in 1.7 and run in version 1.8. (Very choppy)

[11:15:04] [Client thread/INFO]: Setting user: CheckDFX
[11:15:04] [Client thread/INFO]: (Session ID is token:406b47288f0d4a56aa7af048e83fefcf:1e081429871a4ba193b07b2b31316e8a)
[11:15:05] [Client thread/INFO]: LWJGL Version: 2.9.1
[11:15:06] [Client thread/INFO]: Reloading ResourceManager: Default
[11:15:06] [Sound Library Loader/INFO]: Starting up SoundSystem...
[11:15:06] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use
[11:15:06] [Thread-5/INFO]: Initializing LWJGL OpenAL
[11:15:06] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[11:15:06] [Thread-5/INFO]: OpenAL initialized.
[11:15:07] [Sound Library Loader/INFO]: Sound engine started
[11:15:08] [Client thread/INFO]: Created: 512x512 textures-atlas
[11:15:15] [Server thread/INFO]: Starting integrated minecraft server version 1.8
[11:15:15] [Server thread/INFO]: Generating keypair
[11:15:15] [Server thread/INFO]: Preparing start region for level 0
[11:15:16] [Server thread/INFO]: Preparing spawn area: 90%
[11:15:17] [Server thread/INFO]: Changing view distance to 16, from 10
[11:15:17] [Server thread/INFO]: CheckDFX[local:E:95a484bf] logged in with entity id 335 at (272.5435315511919, 84.0, 184.12561670578268)
[11:15:17] [Server thread/INFO]: CheckDFX joined the game
[11:15:25] [Server thread/INFO]: Saving and pausing game...
[11:15:25] [Server thread/INFO]: Saving chunks for level 'Test World v1.8'/Overworld
[11:15:26] [Server thread/INFO]: Saving chunks for level 'Test World v1.8'/Nether
[11:15:26] [Server thread/INFO]: Saving chunks for level 'Test World v1.8'/The End
java.io.IOException: Stream Closed
	at java.io.RandomAccessFile.seek(Native Method)
	at bfv.a(SourceFile:315)
	at bfv.a(SourceFile:255)
	at bfw.close(SourceFile:236)
	at java.util.zip.DeflaterOutputStream.close(Unknown Source)
	at java.io.FilterOutputStream.close(Unknown Source)
	at bfy.a(SourceFile:162)
	at bfy.c(SourceFile:150)
	at brp.c(SourceFile:37)
	at brp.run(SourceFile:30)
	at java.lang.Thread.run(Unknown Source)
[11:15:28] [Server thread/INFO]: Stopping server
[11:15:28] [Server thread/INFO]: Saving players
[11:15:28] [Server thread/INFO]: Saving worlds
[11:15:28] [Server thread/INFO]: Saving chunks for level 'Test World v1.8'/Overworld
[11:15:28] [Server thread/INFO]: Saving chunks for level 'Test World v1.8'/Nether
[11:15:28] [Server thread/INFO]: Saving chunks for level 'Test World v1.8'/The End
[11:15:29] [Client thread/INFO]: Stopping!
[11:15:29] [Client thread/INFO]: SoundSystem shutting down...
[11:15:29] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com




Game created and run in version 1.8 for the first time.  (Runs smooth.)

[11:16:06] [Client thread/INFO]: Setting user: CheckDFX
[11:16:06] [Client thread/INFO]: (Session ID is token:406b47288f0d4a56aa7af048e83fefcf:1e081429871a4ba193b07b2b31316e8a)
[11:16:07] [Client thread/INFO]: LWJGL Version: 2.9.1
[11:16:08] [Client thread/INFO]: Reloading ResourceManager: Default
[11:16:08] [Sound Library Loader/INFO]: Starting up SoundSystem...
[11:16:08] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use
[11:16:08] [Thread-5/INFO]: Initializing LWJGL OpenAL
[11:16:08] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[11:16:09] [Thread-5/INFO]: OpenAL initialized.
[11:16:09] [Sound Library Loader/INFO]: Sound engine started
[11:16:10] [Client thread/INFO]: Created: 512x512 textures-atlas
[11:16:32] [Server thread/INFO]: Starting integrated minecraft server version 1.8
[11:16:32] [Server thread/INFO]: Generating keypair
[11:16:32] [Server thread/INFO]: Converting map!
[11:16:32] [Server thread/INFO]: Scanning folders...
[11:16:32] [Server thread/INFO]: Total conversion count is 0
[11:16:32] [Server thread/INFO]: Preparing start region for level 0
[11:16:33] [Server thread/INFO]: Preparing spawn area: 8%
[11:16:34] [Server thread/INFO]: Preparing spawn area: 15%
[11:16:35] [Server thread/INFO]: Preparing spawn area: 22%
[11:16:36] [Server thread/INFO]: Preparing spawn area: 28%
[11:16:37] [Server thread/INFO]: Preparing spawn area: 35%
[11:16:38] [Server thread/INFO]: Preparing spawn area: 41%
[11:16:39] [Server thread/INFO]: Preparing spawn area: 46%
[11:16:40] [Server thread/INFO]: Preparing spawn area: 52%
[11:16:41] [Server thread/INFO]: Preparing spawn area: 58%
[11:16:42] [Server thread/INFO]: Preparing spawn area: 63%
[11:16:43] [Server thread/INFO]: Preparing spawn area: 70%
[11:16:44] [Server thread/INFO]: Preparing spawn area: 77%
[11:16:45] [Server thread/INFO]: Preparing spawn area: 83%
[11:16:46] [Server thread/INFO]: Preparing spawn area: 89%
[11:16:47] [Server thread/INFO]: Preparing spawn area: 97%
[11:16:48] [Server thread/INFO]: Changing view distance to 16, from 10
[11:16:48] [Server thread/INFO]: CheckDFX[local:E:6b2d7537] logged in with entity id 157 at (-45.5, 83.0, 263.5)
[11:16:48] [Server thread/INFO]: CheckDFX joined the game
[11:17:00] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 11450ms behind, skipping 229 tick(s)
[11:17:14] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 6287ms behind, skipping 125 tick(s)
[11:18:13] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.18.13.png
[11:18:24] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.18.24.png
[11:18:28] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.18.28.png
[11:20:32] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.20.32.png
[11:20:41] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.20.41.png
[11:20:44] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.20.44.png
[11:21:05] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.21.05.png
[11:21:10] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.21.10.png
[11:21:13] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.21.13.png
[11:21:22] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-09-02_11.21.22.png
[11:21:46] [Server thread/INFO]: Saving and pausing game...
[11:21:46] [Server thread/INFO]: Saving chunks for level 'Is it Choppy in 1.8?'/Overworld
[11:21:46] [Server thread/INFO]: Saving chunks for level 'Is it Choppy in 1.8?'/Nether
[11:21:46] [Server thread/INFO]: Saving chunks for level 'Is it Choppy in 1.8?'/The End
[11:21:48] [Server thread/INFO]: Stopping server
[11:21:48] [Server thread/INFO]: Saving players
[11:21:48] [Server thread/INFO]: Saving worlds
[11:21:48] [Server thread/INFO]: Saving chunks for level 'Is it Choppy in 1.8?'/Overworld
[11:21:49] [Server thread/INFO]: Saving chunks for level 'Is it Choppy in 1.8?'/Nether
[11:21:49] [Server thread/INFO]: Saving chunks for level 'Is it Choppy in 1.8?'/The End
[11:21:54] [Client thread/INFO]: Stopping!
[11:21:54] [Client thread/INFO]: SoundSystem shutting down...
[11:21:54] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com