After upgraded from 1.553 to 1.563 build on slave hangs for around 7-8mins when copying artifcates.
Master and slave are running JDK 1.7.0_55.
Slave ist started via JNLP.

Possible related thread on master:
"Executor #0 for DE-DD-0414 : executing srm_dev_unit_tests #2159" prio=6 tid=0x3afae400 nid=0x13e4 in Object.wait() [0x3db5f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:503)
at org.jenkinsci.remoting.nio.FifoBuffer.write(FifoBuffer.java:336)

• locked <0x16b61528> (a org.jenkinsci.remoting.nio.FifoBuffer)
  at org.jenkinsci.remoting.nio.NioChannelHub$NioTransport.writeBlock(NioChannelHub.java:196)
  at hudson.remoting.AbstractByteArrayCommandTransport.write(AbstractByteArrayCommandTransport.java:83)
  at hudson.remoting.Channel.send(Channel.java:545)
• locked <0x16b43950> (a hudson.remoting.Channel)
  at hudson.remoting.ProxyOutputStream._write(ProxyOutputStream.java:163)
• locked <0x16f1eb48> (a hudson.remoting.ProxyOutputStream)
  at hudson.remoting.ProxyOutputStream.write(ProxyOutputStream.java:109)
  at hudson.remoting.RemoteOutputStream.write(RemoteOutputStream.java:110)
  at java.security.DigestOutputStream.write(Unknown Source)
  at hudson.remoting.RemoteOutputStream.write(RemoteOutputStream.java:110)
  at hudson.Util.copyStream(Util.java:448)
  at hudson.FilePath$37.invoke(FilePath.java:1827)
  at hudson.FilePath$37.invoke(FilePath.java:1821)
  at hudson.FilePath.act(FilePath.java:920)
  at hudson.FilePath.act(FilePath.java:893)
  at hudson.FilePath.copyTo(FilePath.java:1821)
  at hudson.plugins.copyartifact.FingerprintingCopyMethod.copyOne(FingerprintingCopyMethod.java:79)
  at hudson.plugins.copyartifact.FingerprintingCopyMethod.copyAll(FingerprintingCopyMethod.java:68)
  at hudson.plugins.copyartifact.CopyArtifact.perform(CopyArtifact.java:368)
  at hudson.plugins.copyartifact.CopyArtifact.perform(CopyArtifact.java:306)
  at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
  at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:745)
  at hudson.model.Build$BuildExecution.build(Build.java:198)
  at hudson.model.Build$BuildExecution.doRun(Build.java:159)
  at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:518)
  at hudson.model.Run.execute(Run.java:1706)
  at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
  at hudson.model.ResourceController.execute(ResourceController.java:88)
  at hudson.model.Executor.run(Executor.java:231)