Minecraft Forums

After I updated java 7 update 51 to java 8, I have been getting a lot of fps lag in the latest development version of minecraft.
Here is the log file:
[09:56:58] [main/INFO]: Setting user: superexploding
[09:56:58] [main/INFO]: (Session ID is token:7449a209a9934fe4b0daf38ec133ba43:00350059658f4e268413a7cad407534d)
[09:56:59] [Client thread/INFO]: LWJGL Version: 2.9.1
[09:57:00] [Client thread/INFO]: Reloading ResourceManager: Default
[09:57:01] [Sound Library Loader/INFO]: Sound engine started
[09:57:01] [Client thread/INFO]: Created: 512x256 textures/blocks-atlas
[09:57:01] [Client thread/INFO]: Created: 256x256 textures/items-atlas
[09:57:03] [MCO Availability Checker #1/ERROR]: Couldn't connect to Realms
chi:
at cgn.a(SourceFile:251) ~[14w11b.jar:?]
at cgn.b(SourceFile:86) ~[14w11b.jar:?]
at bjl.run(SourceFile:206) [14w11b.jar:?]
[09:57:11] [Server thread/INFO]: Starting integrated minecraft server version 14w11b
[09:57:11] [Server thread/INFO]: Generating keypair
[09:57:12] [Server thread/INFO]: Preparing start region for level 0
[09:57:13] [Server thread/INFO]: Preparing spawn area: 82%
[09:57:13] [Server thread/INFO]: Changing view distance to 12, from 10
[09:57:14] [Server thread/INFO]: superexploding[local:E:d385eb80] logged in with entity id 362 at (-80.2591715513693, 75.86213854363565, 291.9037474239602)
[09:57:14] [Server thread/INFO]: superexploding joined the game
[09:57:22] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2970ms behind, skipping 59 tick(s)
[09:57:36] [Server thread/INFO]: Saving and pausing game...
[09:57:39] [Server thread/INFO]: Saving chunks for level '14w11b'/Overworld
[09:57:43] [Server thread/INFO]: Saving chunks for level '14w11b'/Nether
[09:57:43] [Server thread/INFO]: Saving chunks for level '14w11b'/The End
[09:57:43] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 7160ms behind, skipping 143 tick(s)
[09:57:51] [Server thread/INFO]: Stopping server
[09:57:51] [Server thread/INFO]: Saving players
[09:57:54] [Server thread/INFO]: Saving worlds
[09:57:54] [Server thread/INFO]: Saving chunks for level '14w11b'/Overworld
[09:57:55] [Client thread/INFO]: Stopping!