![]() This service is important for overall system performance but can sometimes cause high disk usage. It does this by analyzing your most commonly used programs and then pre-loading them into your computer’s memory so they can start faster. Its main purpose is to improve your system over time by optimizing your startup applications. Before Vista, it was known as prefetch in Windows XP. The service host sysmain, formally known as Superfetch, is a built-in bundle of system processes introduced back in Windows Vista in 2007. What is Service Host Sysmain, also known as Superfetch? We will then provide troubleshooting steps to solve the service host sysmain high disk usage issue on Windows 10 /11. In this detailed guide, we will run through what service host sysmain is, why it might be causing high disk usage, whether it’s a virus, and if it is safe to disable it. This can happen for a number of reasons, but one reason that is reported a lot is due to the service host sysmain program, also known as Superfetch. If your computer is suddenly having performance issues, the most common culprit is having high disk usage, which is when an application or process begins eating up your hard drive disk’s resources. ![]()
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