[MC-111221] servers cant keep up, skipping ticks, and just crashing when it tries to render the world

Crash report it shows me
Completely ignored arguments: [--nativeLauncherVersion, 307]
[16:59:15] [Client thread/INFO]: Setting user: peaceowner
[16:59:21] [Client thread/WARN]: Skipping bad option: lastServer:
[16:59:21] [Client thread/INFO]: LWJGL Version: 2.9.4
[16:59:22] [Client thread/INFO]: Reloading ResourceManager: Default
[16:59:25] [Sound Library Loader/INFO]: Starting up SoundSystem...
[16:59:25] [Thread-5/INFO]: Initializing LWJGL OpenAL
[16:59:25] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[16:59:43] [Client thread/INFO]: Created: 1024x512 textures-atlas
[16:59:54] [Thread-5/INFO]: OpenAL initialized.
[16:59:54] [Sound Library Loader/INFO]: Sound engine started
[17:02:06] [Server thread/INFO]: Starting integrated minecraft server version 1.11
[17:02:06] [Server thread/INFO]: Generating keypair
[17:02:08] [Server thread/INFO]: Preparing start region for level 0
[17:02:09] [Server thread/INFO]: Preparing spawn area: 3%
[17:02:11] [Server thread/INFO]: Preparing spawn area: 4%
[17:02:12] [Server thread/INFO]: Preparing spawn area: 6%
[17:02:13] [Server thread/INFO]: Preparing spawn area: 8%
[17:02:14] [Server thread/INFO]: Preparing spawn area: 9%
[17:02:15] [Server thread/INFO]: Preparing spawn area: 11%
[17:02:16] [Server thread/INFO]: Preparing spawn area: 13%
[17:02:17] [Server thread/INFO]: Preparing spawn area: 14%
[17:02:18] [Server thread/INFO]: Preparing spawn area: 17%
[17:02:19] [Server thread/INFO]: Preparing spawn area: 19%
[17:02:20] [Server thread/INFO]: Preparing spawn area: 22%
[17:02:21] [Server thread/INFO]: Preparing spawn area: 24%
[17:02:22] [Server thread/INFO]: Preparing spawn area: 26%
[17:02:23] [Server thread/INFO]: Preparing spawn area: 28%
[17:02:24] [Server thread/INFO]: Preparing spawn area: 31%
[17:02:25] [Server thread/INFO]: Preparing spawn area: 33%
[17:02:26] [Server thread/INFO]: Preparing spawn area: 37%
[17:02:27] [Server thread/INFO]: Preparing spawn area: 41%
[17:02:28] [Server thread/INFO]: Preparing spawn area: 45%
[17:02:29] [Server thread/INFO]: Preparing spawn area: 47%
[17:02:31] [Server thread/INFO]: Preparing spawn area: 51%
[17:02:32] [Server thread/INFO]: Preparing spawn area: 55%
[17:02:33] [Server thread/INFO]: Preparing spawn area: 59%
[17:02:34] [Server thread/INFO]: Preparing spawn area: 64%
[17:02:35] [Server thread/INFO]: Preparing spawn area: 68%
[17:02:36] [Server thread/INFO]: Preparing spawn area: 72%
[17:02:37] [Server thread/INFO]: Preparing spawn area: 76%
[17:02:38] [Server thread/INFO]: Preparing spawn area: 80%
[17:02:39] [Server thread/INFO]: Preparing spawn area: 85%
[17:02:40] [Server thread/INFO]: Preparing spawn area: 90%
[17:02:41] [Server thread/INFO]: Preparing spawn area: 95%
[17:02:42] [Server thread/INFO]: Changing view distance to 12, from 10
[17:02:46] [Server thread/INFO]: peaceowner[local:E:d3c4afa7] logged in with entity id 1143 at (-241.5, 68.0, 214.5)
[17:02:46] [Server thread/INFO]: peaceowner joined the game
[17:03:03] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 21341ms behind, skipping 426 tick(s)
[17:03:20] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 16327ms behind, skipping 326 tick(s)