14w34d(1.8)
......
This happened in Debug mode,I switch to gamemode c after Minecraft loaded the world...I saw a row of gold pressure plate and I fly through them,but...

What I expected to happen was...:
Pressure plate will create beautiful 'tick tick tok tok' sound

What actually happened was...:
*CPU Utilization suddenly raise 44% (23%->67%)
*Make my computer lag
Steps to Reproduce:
1. Switch to Debug mode
2. Switch gamemode s to gamemode c (/gamemode c)
3.Fly through Gold Pressure plate

......Please Fix it ^_

Here is ......

[20:15:44] [pool-2-thread-1/WARN]: Couldn't look up profile properties for com.mojang.authlib.GameProfile@2fcc2471[id=2561594a-c282-4ab7-b50c-068770cb9c6c,name=HyperXraft,properties={},legacy=false]
com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server
at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:71) ~[authlib-1.5.17.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(YggdrasilMinecraftSessionService.java:158) [authlib-1.5.17.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(YggdrasilMinecraftSessionService.java:53) [authlib-1.5.17.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService$1.load(YggdrasilMinecraftSessionService.java:50) [authlib-1.5.17.jar:?]
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache.get(LocalCache.java:3934) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821) [guava-17.0.jar:?]
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827) [guava-17.0.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:148) [authlib-1.5.17.jar:?]
at cvs.run(SourceFile:106) [14w34d.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_60]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_60]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_60]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_60]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_60]
Caused by: java.net.SocketTimeoutException: connect timed out
at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method) ~[?:1.7.0_60]
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) ~[?:1.7.0_60]
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) ~[?:1.7.0_60]
at java.net.AbstractPlainSocketImpl.connect(Unknown Source) ~[?:1.7.0_60]
at java.net.PlainSocketImpl.connect(Unknown Source) ~[?:1.7.0_60]
at java.net.SocksSocketImpl.connect(Unknown Source) ~[?:1.7.0_60]
at java.net.Socket.connect(Unknown Source) ~[?:1.7.0_60]
at sun.security.ssl.SSLSocketImpl.connect(Unknown Source) ~[?:1.7.0_60]
at sun.net.NetworkClient.doConnect(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.http.HttpClient.openServer(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.http.HttpClient.openServer(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.protocol.https.HttpsClient.<init>(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.protocol.https.HttpsClient.New(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.7.0_60]
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) ~[?:1.7.0_60]
at com.mojang.authlib.HttpAuthenticationService.performGetRequest(HttpAuthenticationService.java:126) ~[authlib-1.5.17.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:54) ~[authlib-1.5.17.jar:?]
... 18 more