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this is a singleplayer world so basically what happens is that when i load up the world, it does its usual thing and loads up. For some reason, it decides to stay at the 'downloading terrain' bit for like an extra 30 seconds. After that, it loads the world but the chunk is like halved or cut into pieces. after a bit of waiting they eventually load but then the blocks break but dont drop anything. then it does some massive lag (not fps drop but like actual lag you would find in a server) and the blocks do load. PLEASE HELP ME FIX THIS

Here are some screenshots

file:///C:/Users/jason/AppData/Roaming/.minecraft/screenshots/2013-01-31_00.27.12.png
file:///C:/Users/jason/AppData/Roaming/.minecraft/screenshots/2013-01-31_00.27.25.png
file:///C:/Users/jason/AppData/Roaming/.minecraft/screenshots/2013-01-31_00.27.27.png

im not sure if u can view them but anyways PLEASE HELP ME!!!!

i know it is modded but i tried taking the mods away and it does the same thing so it doesn't really do anything.

Here is the crash report:

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 30/01/13 8:42 PM
Description: Ticking entity

java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.util.Arrays.copyOf(Unknown Source)
at java.util.ArrayList.grow(Unknown Source)
at java.util.ArrayList.ensureCapacityInternal(Unknown Source)
at java.util.ArrayList.add(Unknown Source)
at aog.a(SourceFile:24)
at amq.e(SourceFile:557)
at amq.a(SourceFile:552)
at yc.a(SourceFile:910)
at lq.d(SourceFile:474)
at md.e(EntityLiving.java:1524)
at md.c(EntityLiving.java:1822)
at qj.c(SourceFile:26)
at md.j_(EntityLiving.java:807)
at qj.j_(SourceFile:31)
at qc.j_(SourceFile:108)
at yc.a(SourceFile:1319)
at in.a(SourceFile:450)
at yc.g(SourceFile:1297)
at yc.h(SourceFile:1196)
at in.h(SourceFile:362)
at net.minecraft.server.MinecraftServer.r(SourceFile:744)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)


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

-- Head --
Stacktrace:
at java.util.Arrays.copyOf(Unknown Source)
at java.util.Arrays.copyOf(Unknown Source)
at java.util.ArrayList.grow(Unknown Source)
at java.util.ArrayList.ensureCapacityInternal(Unknown Source)
at java.util.ArrayList.add(Unknown Source)
at aog.a(SourceFile:24)
at amq.e(SourceFile:557)
at amq.a(SourceFile:552)
at yc.a(SourceFile:910)
at lq.d(SourceFile:474)
at md.e(EntityLiving.java:1524)
at md.c(EntityLiving.java:1822)
at qj.c(SourceFile:26)
at md.j_(EntityLiving.java:807)
at qj.j_(SourceFile:31)
at qc.j_(SourceFile:108)
at yc.a(SourceFile:1319)
at in.a(SourceFile:450)
at yc.g(SourceFile:1297)

-- Entity being ticked --
Details:
Entity Type: Creeper (qc)
Entity ID: 2185
Name: Creeper
Exact location: 155.57, 43.00, 582.32
Block location: World: (155,43,582), Chunk: (at 11,2,6 in 9,36; contains blocks 144,0,576 to 159,255,591), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
Momentum: 65.38, -0.08, 19.92
Stacktrace:
at yc.h(SourceFile:1196)
at in.h(SourceFile:362)

-- Affected level --
Details:
Level name: Survival World
All players: 1 total; [iq['ImJavont'/251, l='Survival World', x=159.52, y=75.02, z=497.84]]
Chunk stats: ServerChunkCache: 890 Drop: 0
Level seed: 1996484718
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (136,64,256), Chunk: (at 8,4,0 in 8,16; contains blocks 128,0,256 to 143,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 2633407 game time, 2621838 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 159057 (now: false), thunder time: 18220 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:744)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_11, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 37617784 bytes (35 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 13845150 (775328400 bytes; 739 MB) allocated, 13845150 (775328400 bytes; 739 MB) used
Suspicious classes: Config, VersionCheckThread, TextureHDFX, ...]
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
ModLoader: Mods loaded: 2
ModLoader 1.4.7
mod_TooManyItems 1.4.7 2012-01-09

Profiler Position: N/A (disabled)
Vec3 Pool Size: 48601 (2721656 bytes; 2 MB) allocated, 4310 (241360 bytes; 0 MB) used
Player Count: 1 / 8; [iq['ImJavont'/251, l='Survival World', x=159.52, y=75.02, z=497.84]]
Type: Integrated Server (map_client.txt)
Is Modded: Very likely; Jar signature invalidated

If it did this without mods then his issue is likely that his system resources are too low anyway. He may not have enough system ram to allocate more and as I said, not sure that even if he did have more ram to allocate it would solve his issue because a vanilla install wouldn't run either. In fact he might try allocating less ram.

No with optifine i can run minecraft normally and custom settings at sometimes 80+ FPS!!!!! so ram is kinda not the problem here. minecraft just suddenly stopped working and this happened.

i have too many items, modloader and optifine but none of them conflict because i installed them in the right order

OOOPPPSSS i forgot to mention that this only happens to this world. none of my other worlds have this problem