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Im not sure why it keeps happening, but in my Singleplayer world when I go through my nether portal to the over world i have 1 fps and then the game soon crashes Here is the Crash report:

-- Resource location being registered --
Details:
Resource location: minecraft:textures/gui/container/inventory.png
Texture object class: bme
Stacktrace:
at bmj.a(TextureManager.java:87)
at bmj.a(TextureManager.java:49)
at azc.a(SourceFile:55)
at ayl.a(SourceFile:80)
at ayw.a(SourceFile:36)
at azc.a(SourceFile:47)
at bfk.a(EntityRenderer.java:1324)
at ave.av(SourceFile:914)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- Screen render details --
Details:
Screen name: azc
Mouse location: Scaled: (213, 119). Absolute: (427, 240)
Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bew['Deluxe420'/235, l='MpServer', x=25.40, y=81.00, z=38.36]]
Chunk stats: MultiplayerChunkCache: 1681, 1681
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: 8.00,64.00,8.00 - World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1965684 game time, 581530 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 63 total; [vw['Zombie Pigman'/5635, l='MpServer', x=39.50, y=59.00, z=27.50], vw['Zombie Pigman'/5252, l='MpServer', x=-55.25, y=67.00, z=63.25], vw['Zombie Pigman'/5636, l='MpServer', x=38.50, y=59.00, z=23.50], vw['Zombie Pigman'/5253, l='MpServer', x=-50.50, y=68.00, z=68.50], vw['Zombie Pigman'/5637, l='MpServer', x=32.28, y=58.00, z=26.50], vw['Zombie Pigman'/5254, l='MpServer', x=-48.50, y=68.00, z=68.50], vw['Zombie Pigman'/5638, l='MpServer', x=40.13, y=60.00, z=29.53], wa['Skeleton'/5255, l='MpServer', x=-44.66, y=66.50, z=46.59], vw['Zombie Pigman'/5639, l='MpServer', x=89.50, y=80.00, z=66.50], wa['Skeleton'/5256, l='MpServer', x=-38.19, y=65.00, z=51.56], wa['Skeleton'/5640, l='MpServer', x=91.50, y=80.00, z=67.50], vu['Magma Cube'/5257, l='MpServer', x=-40.50, y=66.00, z=51.97], bew['Deluxe420'/235, l='MpServer', x=25.40, y=81.00, z=38.36], vw['Zombie Pigman'/5260, l='MpServer', x=-24.16, y=55.00, z=40.31], uz['item.item.yellowDust'/5261, l='MpServer', x=-26.91, y=37.00, z=88.97], uz['item.tile.hellrock'/5262, l='MpServer', x=-26.06, y=37.00, z=87.13], uz['item.tile.hellrock'/5263, l='MpServer', x=-28.66, y=36.00, z=88.75], uz['item.tile.hellrock'/5264, l='MpServer', x=-25.56, y=38.00, z=89.84], vw['Zombie Pigman'/5265, l='MpServer', x=-13.00, y=7.00, z=108.41], vw['Zombie Pigman'/5266, l='MpServer', x=-17.50, y=7.00, z=112.50], vl['Blaze'/5267, l='MpServer', x=-4.50, y=55.00, z=42.50], vw['Zombie Pigman'/5268, l='MpServer', x=-12.81, y=37.00, z=68.72], uz['item.tile.hellrock'/5269, l='MpServer', x=-13.06, y=61.00, z=67.13], vw['Zombie Pigman'/5270, l='MpServer', x=-2.50, y=13.00, z=111.50], vw['Zombie Pigman'/5271, l='MpServer', x=-4.50, y=13.00, z=110.50], vw['Zombie Pigman'/5274, l='MpServer', x=-14.50, y=7.00, z=113.50], vw['Zombie Pigman'/5275, l='MpServer', x=-8.16, y=10.00, z=119.44], vw['Zombie Pigman'/5276, l='MpServer', x=-12.50, y=8.00, z=116.50], vw['Zombie Pigman'/5277, l='MpServer', x=-2.50, y=11.00, z=118.50], vw['Zombie Pigman'/5278, l='MpServer', x=7.72, y=13.00, z=111.13], vw['Zombie Pigman'/5279, l='MpServer', x=-10.50, y=92.00, z=115.50], uz['item.tile.mushroom'/5283, l='MpServer', x=8.91, y=50.00, z=94.41], vw['Zombie Pigman'/5284, l='MpServer', x=6.78, y=13.00, z=110.28], vw['Zombie Pigman'/5285, l='MpServer', x=1.38, y=12.00, z=110.97], vw['Zombie Pigman'/5289, l='MpServer', x=2.50, y=12.00, z=118.53], vw['Zombie Pigman'/5292, l='MpServer', x=23.50, y=92.00, z=4.50], vw['Zombie Pigman'/5293, l='MpServer', x=27.81, y=90.00, z=7.63], vw['Zombie Pigman'/5294, l='MpServer', x=29.53, y=100.00, z=53.94], vw['Zombie Pigman'/5295, l='MpServer', x=18.50, y=19.00, z=76.50], vw['Zombie Pigman'/5296, l='MpServer', x=31.50, y=109.00, z=96.50], vw['Zombie Pigman'/5297, l='MpServer', x=41.47, y=78.00, z=28.81], vw['Zombie Pigman'/5298, l='MpServer', x=39.91, y=44.00, z=91.59], vw['Zombie Pigman'/5306, l='MpServer', x=55.50, y=92.00, z=43.50], vw['Zombie Pigman'/5307, l='MpServer', x=54.50, y=92.00, z=42.50], vw['Zombie Pigman'/5308, l='MpServer', x=77.50, y=15.00, z=32.50], vw['Zombie Pigman'/5309, l='MpServer', x=65.50, y=86.00, z=58.50], vw['Zombie Pigman'/5310, l='MpServer', x=76.50, y=10.00, z=88.50], vw['Zombie Pigman'/5312, l='MpServer', x=82.38, y=15.00, z=39.13], vw['Zombie Pigman'/5313, l='MpServer', x=86.59, y=15.00, z=33.53], vw['Zombie Pigman'/5314, l='MpServer', x=84.59, y=15.00, z=43.94], vu['Magma Cube'/5315, l='MpServer', x=94.03, y=70.44, z=90.44], vw['Zombie Pigman'/5316, l='MpServer', x=90.56, y=49.00, z=106.75], vw['Zombie Pigman'/5317, l='MpServer', x=89.50, y=118.00, z=105.50], vw['Zombie Pigman'/5318, l='MpServer', x=90.50, y=118.00, z=105.50], vw['Zombie Pigman'/5319, l='MpServer', x=91.50, y=118.00, z=105.50], vu['Magma Cube'/5320, l='MpServer', x=101.04, y=68.55, z=-1.56], vl['Blaze'/5321, l='MpServer', x=100.50, y=67.00, z=28.50], vw['Zombie Pigman'/5322, l='MpServer', x=101.50, y=45.00, z=38.50], vw['Zombie Pigman'/5323, l='MpServer', x=105.50, y=35.00, z=59.50], vw['Zombie Pigman'/5324, l='MpServer', x=96.50, y=25.00, z=77.50], vw['Zombie Pigman'/5325, l='MpServer', x=97.50, y=67.00, z=75.50], vw['Zombie Pigman'/5326, l='MpServer', x=100.47, y=67.00, z=79.06], vl['Blaze'/5329, l='MpServer', x=100.28, y=67.00, z=80.69]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server

-- System Details --
Details:
Minecraft Version: 1.8.7
Operating System: Mac OS X (x86_64) version 10.9.5
CPU: 4x Intel(R) Core(TM) i5-4670 CPU @ 3.40GHz
Java Version: 1.8.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 20996928 bytes (20 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.8.7-OptiFine_HD_U_D6
LWJGL: 2.9.2
OpenGL: NVIDIA GeForce GTX 775M OpenGL Engine GL version 2.1 NVIDIA-8.26.29 310.40.55f01, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Resource Packs: [PureBDcraft 256x MC18]
Current Language: English (US)
Profiler Position: N/A (disabled)