fps will be normal but the response from the game was slow as if i was on a laggy server on multi-player.
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Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.

---- Minecraft Crash Report ----
// I blame Dinnerbone.
Time: 6/19/13 1:53 PM
Description: Manually triggered debug crash
java.lang.Throwable
at atl.k(SourceFile:1227)
at atl.S(SourceFile:657)
at atl.d(SourceFile:613)
at net.minecraft.client.main.Main.main(SourceFile:101)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bcm['SkyLord_Namis'/163746, l='MpServer', x=142.32, y=65.62, z=-329.30]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (164,4,-169), Chunk: (at 4,0,7 in 10,-11; contains blocks 160,0,-176 to 175,255,-161), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 54314 game time, 54314 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: 32 total; [sn['item.tile.dirt'/428524, l='MpServer', x=109.44, y=63.13, z=-340.22], sp['entity.MinecartChest.name'/299891, l='MpServer', x=214.47, y=38.34, z=-379.47], sn['item.tile.dirt'/430106, l='MpServer', x=124.22, y=62.13, z=-333.81], nz['entity.LeashKnot.name'/327693, l='MpServer', x=167.50, y=65.50, z=-249.50], rj['Bat'/431959, l='MpServer', x=219.78, y=37.35, z=-379.65], rn['Horse'/163678, l='MpServer', x=161.28, y=64.00, z=-252.44], rn['Horse'/163666, l='MpServer', x=160.06, y=64.00, z=-250.66], bcm['SkyLord_Namis'/163746, l='MpServer', x=142.32, y=65.62, z=-329.30], rj['Bat'/425960, l='MpServer', x=214.25, y=40.10, z=-386.50], rj['Bat'/425963, l='MpServer', x=210.25, y=40.10, z=-381.75], rj['Bat'/421358, l='MpServer', x=96.25, y=53.10, z=-282.50], rj['Bat'/430790, l='MpServer', x=78.34, y=13.71, z=-347.09], nz['entity.LeashKnot.name'/373436, l='MpServer', x=162.50, y=65.50, z=-249.50], sn['item.tile.dirt'/430330, l='MpServer', x=124.81, y=62.13, z=-333.34], tu['Villager'/296675, l='MpServer', x=161.50, y=64.00, z=-336.22], tu['Villager'/296674, l='MpServer', x=152.44, y=64.00, z=-330.28], tu['Villager'/295824, l='MpServer', x=151.31, y=65.00, z=-336.41], rj['Bat'/428296, l='MpServer', x=77.50, y=14.00, z=-336.94], tu['Villager'/296668, l='MpServer', x=147.78, y=64.00, z=-332.56], tu['Villager'/296669, l='MpServer', x=150.13, y=65.00, z=-344.53], tu['Villager'/296670, l='MpServer', x=159.38, y=65.00, z=-340.34], tu['Villager'/296664, l='MpServer', x=145.47, y=65.00, z=-336.75], tu['Villager'/296666, l='MpServer', x=155.28, y=64.00, z=-330.59], tu['Villager'/296667, l='MpServer', x=153.50, y=65.00, z=-336.31], rj['Bat'/428308, l='MpServer', x=184.84, y=27.76, z=-400.55], tu['Villager'/296662, l='MpServer', x=153.94, y=65.50, z=-341.50], tu['Villager'/296663, l='MpServer', x=152.44, y=64.00, z=-333.66], tu['Villager'/295823, l='MpServer', x=133.38, y=64.00, z=-336.59], tu['Villager'/295822, l='MpServer', x=151.39, y=61.00, z=-352.56], tu['Villager'/295821, l='MpServer', x=152.69, y=64.00, z=-344.69], tu['Villager'/295820, l='MpServer', x=158.28, y=64.00, z=-332.69], tu['Villager'/296659, l='MpServer', x=148.13, y=64.00, z=-331.50]]
Retry entities: 0 total; []
Stacktrace:
at bcj.a(SourceFile:284)
at atl.b(SourceFile:1764)
at atl.d(SourceFile:622)
at net.minecraft.client.main.Main.main(SourceFile:101)
-- System Details --
Details:
Minecraft Version: 13w25b
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 698977992 bytes (666 MB) / 1425670144 bytes (1359 MB) up to 4772200448 bytes (4551 MB)
JVM Flags: 1 total; -Xmx5G
AABB Pool Size: 467 (26152 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 13w25b
LWJGL: 2.9.0
OpenGL: AMD Radeon HD 7540D GL version 4.2.11750 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 165 (9240 bytes; 0 MB) allocated, 21 (1176 bytes; 0 MB) used

Nothing special to see...Does it happen on a specific world or also on a newly generated one?

Well there is 5gb allocated to the game, It probably doesn't effect the server side and that will kinda explain.

Client> 2013-06-19 13:15:58 SERVER INFO Starting integrated minecraft server version 13w25b
Client> 2013-06-19 13:15:58 SERVER INFO Generating keypair
Client> 2013-06-19 13:15:58 SERVER INFO Preparing start region for level 0
Client> loading single player
Client> 2013-06-19 13:15:59 SERVER INFO SkyLord_Namis/127.0.0.1:0 logged in with entity id 155158 at (-17.136968913459253, 64.0, -428.61769884098226)
Client> 2013-06-19 13:15:59 SERVER INFO SkyLord_Namis joined the game
Client> Setting up custom skins
Client> 2013-06-19 13:16:00 SERVER INFO Saving and pausing game...
Client> 2013-06-19 13:16:00 SERVER INFO Saving chunks for level 'We are the snapshotians'/Overworld
Client> 2013-06-19 13:16:00 SERVER INFO Saving chunks for level 'We are the snapshotians'/Nether
Client> 2013-06-19 13:16:00 SERVER INFO Saving chunks for level 'We are the snapshotians'/The End
Client> 2013-06-19 13:17:03 SERVER WARNING Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-06-19 13:17:18 SERVER INFO Saving and pausing game...
Client> 2013-06-19 13:17:18 SERVER INFO Saving chunks for level 'We are the snapshotians'/Overworld
Client> 2013-06-19 13:17:18 SERVER INFO Saving chunks for level 'We are the snapshotians'/Nether
Client> 2013-06-19 13:17:18 SERVER INFO Saving chunks for level 'We are the snapshotians'/The End
Client> 2013-06-19 13:17:18 SERVER INFO Stopping server
Client> 2013-06-19 13:17:19 SERVER INFO Saving players
Client> 2013-06-19 13:17:19 SERVER INFO SkyLord_Namis left the game
Client> 2013-06-19 13:17:19 SERVER INFO Saving worlds
Client> 2013-06-19 13:17:19 SERVER INFO Saving chunks for level 'We are the snapshotians'/Overworld
Client> 2013-06-19 13:17:19 SERVER INFO Saving chunks for level 'We are the snapshotians'/Nether
Client> 2013-06-19 13:17:19 SERVER INFO Saving chunks for level 'We are the snapshotians'/The End
Client> 2013-06-19 13:17:31 SERVER INFO Starting integrated minecraft server version 13w25b
Client> 2013-06-19 13:17:31 SERVER INFO Generating keypair
Client> 2013-06-19 13:17:31 SERVER INFO Preparing start region for level 0
Client> loading single player
Client> 2013-06-19 13:17:33 SERVER INFO SkyLord_Namis/127.0.0.1:0 logged in with entity id 163746 at (147.4661410019476, 64.0, -368.30000001192093)
Client> 2013-06-19 13:17:33 SERVER INFO SkyLord_Namis joined the game
Client> Setting up custom skins
Client> 2013-06-19 13:17:39 SERVER WARNING Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-06-19 13:17:47 SERVER INFO <SkyLord_Namis> obsorp
Client> 2013-06-19 13:17:47 CLIENT INFO CHAT <SkyLord_Namis> obsorp
Client> 2013-06-19 13:18:05 SERVER WARNING Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-06-19 13:18:16 SERVER WARNING Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-06-19 13:18:40 SERVER WARNING Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-06-19 13:20:08 SERVER WARNING Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-06-19 13:20:38 SERVER INFO Saving and pausing game...
Client> 2013-06-19 13:20:38 SERVER INFO Saving chunks for level 'We are the snapshotians'/Overworld
Client> 2013-06-19 13:20:38 SERVER INFO Saving chunks for level 'We are the snapshotians'/Nether
Client> 2013-06-19 13:20:38 SERVER INFO Saving chunks for level 'We are the snapshotians'/The End

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

I having this issue. Its apearing in snapshots 19a and up(not tryed below 19a). Happneds after 10 - 60 mins of playing on it. Not sure if its the world or not .
Edit: Here is a forced crash report http://pastebin.com/tsGZx66B

I just uploaded the map I had the problem on
Edit: I deleted all air blocks on the map I sent and there hasnt been a problem for a while , must be something to do with the blocks in the map i sent
Edit:2 Pasted the blocks back in seems fine , updated to 26b and it messed up