Even though the server is running fine, entities and redstone are extremely slow

Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.

---- Minecraft Crash Report ----
// Why did you do that?

Time: 7/22/13 12:12 PM
Description: Manually triggered debug crash

java.lang.Throwable
	at ats.k(SourceFile:1238)
	at ats.S(SourceFile:663)
	at ats.d(SourceFile:619)
	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; [bdf['Speedgoergo'/108, l='MpServer', x=161.48, y=55.82, z=91.91]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (6,107,-182), Chunk: (at 6,6,10 in 0,-12; contains blocks 0,0,-192 to 15,255,-177), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 1853356 game time, 90000 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: 80 total; [oc['entity.ItemFrame.name'/139, l='MpServer', x=155.50, y=16.50, z=112.06], oc['entity.ItemFrame.name'/138, l='MpServer', x=152.50, y=16.50, z=112.06], ua['Villager'/141, l='MpServer', x=150.44, y=64.00, z=112.50], oc['entity.ItemFrame.name'/140, l='MpServer', x=158.50, y=16.50, z=112.06], ua['Villager'/143, l='MpServer', x=174.69, y=61.00, z=105.03], rp['Chicken'/142, l='MpServer', x=163.53, y=49.00, z=94.32], ts['Spider'/283, l='MpServer', x=202.13, y=64.00, z=92.97], rn['Bat'/128, l='MpServer', x=111.34, y=42.00, z=145.09], sr['item.item.diode'/131, l='MpServer', x=134.88, y=54.25, z=94.88], ry['Sheep'/130, l='MpServer', x=141.53, y=52.00, z=84.69], rp['Chicken'/133, l='MpServer', x=142.19, y=51.00, z=98.56], tq['Skeleton'/287, l='MpServer', x=209.50, y=64.00, z=90.50], ua['Villager'/132, l='MpServer', x=143.50, y=64.00, z=85.50], tq['Skeleton'/407, l='MpServer', x=190.50, y=79.00, z=166.50], sr['item.item.redstone'/134, l='MpServer', x=128.13, y=52.13, z=127.59], ry['Sheep'/152, l='MpServer', x=210.13, y=64.00, z=44.22], tq['Skeleton'/258, l='MpServer', x=98.50, y=65.00, z=110.50], ry['Sheep'/153, l='MpServer', x=218.97, y=64.00, z=51.09], rx['Pig'/154, l='MpServer', x=223.16, y=64.00, z=101.25], rn['Bat'/155, l='MpServer', x=220.25, y=25.00, z=148.75], ts['Spider'/564, l='MpServer', x=155.72, y=69.00, z=166.72], ts['Spider'/262, l='MpServer', x=234.94, y=71.00, z=140.72], rn['Bat'/156, l='MpServer', x=242.25, y=15.27, z=50.03], ts['Spider'/563, l='MpServer', x=160.50, y=69.00, z=171.88], rp['Chicken'/158, l='MpServer', x=237.41, y=64.00, z=41.53], ua['Villager'/144, l='MpServer', x=174.31, y=61.00, z=105.00], ua['Villager'/145, l='MpServer', x=174.69, y=64.00, z=105.28], te['Creeper'/573, l='MpServer', x=221.50, y=64.00, z=105.50], rx['Pig'/147, l='MpServer', x=190.78, y=62.00, z=20.16], te['Creeper'/571, l='MpServer', x=226.50, y=64.00, z=100.50], rn['Bat'/148, l='MpServer', x=183.63, y=23.10, z=122.44], te['Creeper'/570, l='MpServer', x=225.59, y=64.00, z=109.03], rn['Bat'/150, l='MpServer', x=192.28, y=57.34, z=85.88], rn['Bat'/151, l='MpServer', x=201.75, y=25.10, z=118.28], te['Creeper'/440, l='MpServer', x=129.72, y=64.00, z=24.88], rn['Bat'/163, l='MpServer', x=240.34, y=11.71, z=47.84], tq['Skeleton'/432, l='MpServer', x=181.50, y=23.00, z=142.50], rx['Pig'/161, l='MpServer', x=238.06, y=64.00, z=85.94], ts['Spider'/526, l='MpServer', x=92.25, y=64.00, z=13.59], ry['Sheep'/160, l='MpServer', x=239.50, y=64.00, z=60.63], te['Creeper'/319, l='MpServer', x=240.50, y=21.00, z=50.50], tq['Skeleton'/522, l='MpServer', x=101.50, y=64.00, z=14.50], te['Creeper'/318, l='MpServer', x=239.50, y=21.00, z=48.50], tq['Skeleton'/439, l='MpServer', x=132.88, y=64.00, z=32.28], tv['Zombie'/425, l='MpServer', x=175.77, y=64.00, z=77.44], tv['Zombie'/185, l='MpServer', x=194.50, y=64.00, z=80.25], tv['Zombie'/431, l='MpServer', x=177.50, y=30.00, z=153.50], tv['Zombie'/430, l='MpServer', x=179.50, y=30.00, z=151.50], tq['Skeleton'/179, l='MpServer', x=214.50, y=64.00, z=130.50], ts['Spider'/419, l='MpServer', x=188.78, y=64.00, z=117.97], tq['Skeleton'/177, l='MpServer', x=214.50, y=64.00, z=128.50], tv['Zombie'/537, l='MpServer', x=230.59, y=40.00, z=40.63], tv['Zombie'/423, l='MpServer', x=185.34, y=64.00, z=77.50], ts['Spider'/204, l='MpServer', x=203.00, y=64.00, z=28.19], ts['Spider'/203, l='MpServer', x=201.41, y=64.00, z=29.03], tv['Zombie'/627, l='MpServer', x=200.50, y=42.00, z=138.50], tv['Zombie'/321, l='MpServer', x=87.50, y=55.00, z=157.50], tq['Skeleton'/628, l='MpServer', x=205.50, y=42.00, z=140.50], te['Creeper'/578, l='MpServer', x=183.50, y=64.00, z=23.50], tf['Enderman'/583, l='MpServer', x=182.03, y=64.00, z=16.41], ts['Spider'/501, l='MpServer', x=194.50, y=64.00, z=92.50], te['Creeper'/377, l='MpServer', x=108.50, y=70.00, z=161.50], ua['Villager'/106, l='MpServer', x=121.69, y=64.00, z=103.59], ua['Villager'/107, l='MpServer', x=121.53, y=64.00, z=111.31], tq['Skeleton'/498, l='MpServer', x=146.50, y=64.00, z=33.50], tq['Skeleton'/590, l='MpServer', x=105.50, y=70.00, z=164.50], te['Creeper'/356, l='MpServer', x=105.50, y=64.00, z=66.50], ts['Spider'/490, l='MpServer', x=140.50, y=64.00, z=31.50], rp['Chicken'/127, l='MpServer', x=98.56, y=71.00, z=95.56], tq['Skeleton'/484, l='MpServer', x=102.50, y=64.00, z=13.50], tv['Zombie'/600, l='MpServer', x=115.59, y=64.00, z=105.75], tv['Zombie'/365, l='MpServer', x=187.88, y=64.00, z=77.50], bdf['Speedgoergo'/108, l='MpServer', x=161.48, y=55.82, z=91.91], rp['Chicken'/126, l='MpServer', x=109.53, y=71.00, z=58.63], tv['Zombie'/247, l='MpServer', x=173.41, y=64.00, z=77.56], rn['Bat'/124, l='MpServer', x=80.44, y=46.68, z=172.34], te['Creeper'/245, l='MpServer', x=220.50, y=64.00, z=64.50], rn['Bat'/122, l='MpServer', x=84.53, y=38.10, z=136.25], te['Creeper'/243, l='MpServer', x=223.50, y=64.00, z=60.50], tv['Zombie'/241, l='MpServer', x=196.50, y=73.00, z=162.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bda.a(SourceFile:284)
	at ats.b(SourceFile:1761)
	at ats.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Mac OS X (x86_64) version 10.7.5
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 111558448 bytes (106 MB) / 308781056 bytes (294 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 9857 (551992 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Launched Version: 1.2.5
	LWJGL: 2.9.0
	OpenGL: Intel HD Graphics 3000 OpenGL Engine GL version 2.1 APPLE-7.32.12, Intel Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Legend of Zelda
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 472 (26432 bytes; 0 MB) allocated, 19 (1064 bytes; 0 MB) used

Can you zip the world and attach it here ?

It says that the file/world is too big, and I compressed it, it is 13.40 MB

Copy the world, delete The Nether / The End (folders DIM1 and DIM-1) , maybe it fits. Otherwise use a third party file hoster and provide the link here.

No response in 4 months, assuming no longer an issue.