机器网全部断掉，解决，不卡了
网速特别好，解决不卡了
以上都不行下面的方法试试吧
使用的是官网标准版的eclipse4.3 for javaEE未装任何插件,写JS时卡的简直无法忍受,.project中把注释的的配置段全部删去后,问题解决,编辑JS再也不似蜗牛了.
<buildSpec>
<buildCommand>
<name>org.eclipse.ui.externaltools.ExternalToolBuilder</name>
<triggers>full,incremental,</triggers>
<arguments>
<dictionary>
<key>LaunchConfigHandle</key>
<!--下面这一行-->
<value>&lt;project&gt;/.externalToolBuilders/org.eclipse.wst.jsdt.core.javascriptValidator.launch</value>
</dictionary>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.wst.common.project.facet.core.builder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.ui.externaltools.ExternalToolBuilder</name>
<triggers>full,incremental,</triggers>
<arguments>
<dictionary>
<key>LaunchConfigHandle</key>
<!--下面这一行-->
<value>&lt;project&gt;/.externalToolBuilders/org.eclipse.wst.validation.validationbuilder.launch</value>
</dictionary>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jem.workbench.JavaEMFNature</nature>
<nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature>
<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
<nature>org.eclipse.jdt.core.javanature</nature>
<!--下面这一行-->
<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
</natures>