I updated my pc today to the new Java Runtime Environment (JRE) 6 Update 10. Now that also automaticaly install this new service "JavaQuickStarterService" (jqs.exe), with no way to stop it other than manualy disabling the service (setting it to "manual" won't stop it after next system booting). 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." But from http://www.pcpitstop.com/libraries/process/i/jqs.exe.html: "jqs.exe uses excessive system and memory resources with no corresponding benefit. Applications such as these should be disabled to improve overall system performance." I tried to test it by switching on & off this service and it doesn't seem to majorly slowdown JRE fonctionality, but it could be because I tend to only sparsely use Java aplets in my web browser. I would be interested to know your take on this java prefetching service.