更新：
Eclipse Juno的新性能版本(SP2)已经发布.因此,如果您的Eclipse Juno(4.2)太慢或者它间歇性崩溃,它可以更新到SP2.
只需转到帮助 – >检查更新
附：请在执行此操作之前备份Eclipse文件夹.
ORIGNAL ANSWER：
这是Eclipse Juno中的一个已知问题,并且已经发布了一个补丁.安装此功能可修复性能问题 –
http://wiki.eclipse.org/Platform_UI/Juno_Performance_Investigation
引用
Several major performance defects have been addressed in the Juno SR2
stream (4.2.2). Community members have confirmed that these fixes
substantially address the performance problems with editor and view
opening,closing,and switching. These fixes will be widely available
in the Juno Service Release 2 (February 2013) and Kepler (June 2013)
releases. Meanwhile,a patch is available for those using Juno SR1
that provides early access to these fixes. To install this patch:
Ensure you are already running on a package from the Juno SR1 release
(September 2012) Invoke Help > Install New Software Select this
repository: 07001 Expand
Juno SR1 Patches and install Eclipse UI Juno SR1 Optimizations To
repeat,this patch is only intended for users of the Juno SR1 release.
If you have a Juno SR2 maintenance build from November 21 or later,or Kepler stream milestone M4 or later,this patch is not required.
