lagged world

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 23/03/14 17:16
Description: Updating screen events

java.lang.ArrayIndexOutOfBoundsException: -1
	at java.util.ArrayList.fastRemove(Unknown Source)
	at java.util.ArrayList.remove(Unknown Source)
	at nx.b(SourceFile:62)
	at nw.c(SourceFile:328)
	at pn.e(SourceFile:251)
	at cek.s(SourceFile:293)
	at bfr.a(SourceFile:1755)
	at bfr.a(SourceFile:1743)
	at bis.a(SourceFile:45)
	at biz.a(SourceFile:180)
	at biz.d(SourceFile:242)
	at biz.k(SourceFile:219)
	at bfr.p(SourceFile:1387)
	at bfr.ai(SourceFile:801)
	at bfr.f(SourceFile:755)
	at net.minecraft.client.main.Main.main(SourceFile:121)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at java.util.ArrayList.fastRemove(Unknown Source)
	at java.util.ArrayList.remove(Unknown Source)
	at nx.b(SourceFile:62)
	at nw.c(SourceFile:328)
	at pn.e(SourceFile:251)
	at cek.s(SourceFile:293)
	at bfr.a(SourceFile:1755)
	at bfr.a(SourceFile:1743)
	at bis.a(SourceFile:45)
	at biz.a(SourceFile:180)
	at biz.d(SourceFile:242)
	at biz.k(SourceFile:219)

-- Affected screen --
Details:
	Screen name: bis

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bsv['seannyyx'/96, l='MpServer', x=-194.68, y=5.00, z=-430.22]]
	Chunk stats: MultiplayerChunkCache: 1089, 1089
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options:
	Level spawn location: -189.00,5.00,-417.00 - World: (-189,5,-417), Chunk: (at 3,0,15 in -12,-27; contains blocks -192,0,-432 to -177,255,-417), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 641806 game time, 1140 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 15 total; [xs['Bat'/6036850, l='MpServer', x=-173.81, y=6.10, z=-440.47], xs['Bat'/9469568, l='MpServer', x=-162.75, y=5.00, z=-426.25], xs['Bat'/8915937, l='MpServer', x=-173.81, y=6.10, z=-442.25], bsv['seannyyx'/96, l='MpServer', x=-194.68, y=5.00, z=-430.22], xs['Bat'/9365424, l='MpServer', x=-122.22, y=4.00, z=-386.25], za['item.item.egg'/9068533, l='MpServer', x=-147.69, y=4.00, z=-436.53], xs['Bat'/9497654, l='MpServer', x=-214.13, y=5.00, z=-438.94], xs['Bat'/7914220, l='MpServer', x=-173.81, y=6.10, z=-442.25], xw['Horse'/525171, l='MpServer', x=-145.72, y=4.00, z=-405.88], xw['Horse'/525172, l='MpServer', x=-152.88, y=4.00, z=-395.00], xw['Horse'/525173, l='MpServer', x=-148.97, y=4.00, z=-433.06], xu['Chicken'/525174, l='MpServer', x=-147.69, y=4.00, z=-437.34], bsv['seannyyx'/96, l='MpServer', x=-135.75, y=11.03, z=-441.09], xs['Bat'/9397277, l='MpServer', x=-137.75, y=4.00, z=-388.38], xs['Bat'/9631440, l='MpServer', x=-203.66, y=4.00, z=-441.16]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bqr.a(SourceFile:308)
	at bfr.b(SourceFile:2069)
	at bfr.f(SourceFile:764)
	at net.minecraft.client.main.Main.main(SourceFile:121)

-- System Details --
Details:
	Minecraft Version: 14w11b
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 746713064 bytes (712 MB) / 1339555840 bytes (1277 MB) up to 2863661056 bytes (2731 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 14w11b
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.3412, Intel
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Anisotropic Filtering: On (4)