JavaQuickStarter (JQS) 是Java SE 6u10引入的功能，旨在通过预加载常用Java运行时环境文件到内存中（占用不超过20MB RAM），减少启动时的磁盘I/O操作，从而提升Java应用的启动速度。该服务默认在Windows 2000和Windows XP上启用，并作为Windows服务运行。
今天安装了JRE 6 Update 10，安装完了以后发现系统进程里面多了一个JQS.exe，查了一下资料才发现是Java为提高在Windows 2000和XP平台下的IO性能，运行的一个服务。大家如果不喜欢可以在"控制面板"->"Java"->"高级"Tab->"杂项"中找到关闭这个服务的地方。
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From：http://java.sun.com/javase/6/docs/technotes/guides/jweb/otherFeatures/jqs.html
Java Quick Starter (JQS) improves the initial startup time of Java applets and applications by periodically prefetching some of the most heavily used Java Runtime Environment files into memory (occupying no more than 20Mb of RAM). Later, when Java is launched, much less disk I/O is required and as a result, startup is much faster.
JQS is enabled by default in the Windows 2000 and Windows XP operating systems running on x86 (IA-32) or compatible hardware. It is turned off in Windows Vista because Windows Vista offers its own preloading mechanisms. When fully enabled, JQS runs as a Windows service called Java Quick Starter. The Task Manager shows a jqs.exe process.
The JQS service will perform runtime checks to determine if the system is running on battery power. If so, prefetching will be suspended until AC power is restored. This scenario is most common on laptop PCs.
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