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Hello. My FPS has dropped by about 20-30 and I only have Optifine (1.7.2) Armor Status and Status Effect (Both 1.7.2) and it was running fine until I changed something in my task manager to apparently help my FPS.
Ever since I did, I got less fps, when ever i pressed esc, my game crashed, and things like that Not sure what this means, but if any of you know, please tell me
---- Minecraft Crash Report ----
// Don't do that.

Time: 2/19/14 3:03 PM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
at net.minecraftforge.common.ForgeChunkManager.saveWorld(ForgeChunkManager.java:818)
at net.minecraftforge.common.ForgeInternalHandler.onDimensionSave(ForgeInternalHandler.java:69)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_2_ForgeInternalHandler_onDimensionSave_Save.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:51)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:122)
at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:841)
at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:344)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:180)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:705)


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

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 216527256 bytes (206 MB) / 459276288 bytes (438 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 880 (49280 bytes; 0 MB) allocated, 698 (39088 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.01-pre FML v7.2.116.1025 Minecraft Forge 10.12.0.1025 Optifine OptiFine_1.7.2_HD_U_A9 6 mods loaded, 6 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.2.116.1025} [Forge Mod Loader] (forge-1.7.2-10.12.0.1025.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.12.0.1025} [Minecraft Forge] (forge-1.7.2-10.12.0.1025.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bspkrsCore{6.0(1.7.2)} [bspkrsCore] ([1.7.2]bspkrsCore-universal-6.0(1.7.2).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ArmorStatusHUD{1.18(1.7.2)} [ArmorStatusHUD] ([1.7.2]ArmorStatusHUD-client-1.18(1.7.2).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
StatusEffectHUD{1.21(1.7.2)} [StatusEffectHUD] ([1.7.2]StatusEffectHUD-client-1.21(1.7.2).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 134 (7504 bytes; 0 MB) allocated, 94 (5264 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['LTcoco'/54, l='pot', x=-605.46, y=4.00, z=-28.68]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'