If your HDD runs at 100% for a few minutes every time you start or restart your computer, Superfetch could be the culprit. System startup can be sluggish because Superfetch is preloading a bunch of data from your HDD to RAM. Whenever that loading happens, your system still experiences the same slowdown as if you were launching the app without Superfetch. Rather, it relocates the loading to an earlier time. Superfetch doesn't eliminate the need to load apps into RAM. Since Superfetch is always running in the background, the Superfetch service itself is always using some CPU and RAM.
There's a good chance Superfetch is already running on your system right now, and you didn't even know.īut there are some "problems" that can arise with Superfetch (SysMain):
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If you have a modern PC with average specs or better, Superfetch most likely runs so smoothly that you won't even notice it. Is Superfetch (SysMain) Really Necessary?įor the most part, Superfetch is useful. The idea is that when you do want to run the app, it will launch much faster because it's already preloaded in memory. Superfetch shows up as "Service Host: SysMain" in the Windows Task Manager. Over time, Superfetch marks these apps as "frequently used" and preloads them into RAM ahead of time. It sits quietly in the background, constantly analyzing RAM usage patterns and learning what kinds of apps you run most often. The official description of the Superfetch service says that it "maintains and improves system performance over time," but that's vague and doesn't explain the whole story. Superfetch is a feature that was introduced back in Windows Vista.
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In this article, you'll learn everything you need to know about what Superfetch (SysMain) is, how it works, why it might be problematic, and how to disable it if it's causing issues. Of the many ways to improve Windows 10 performance, there's one lesser-known feature that you should know about: Superfetch is now referred to as SysMain after the Windupdate.
Windows 10 is a definite improvement over previous versions in many ways-but it can also feel slow and sluggish when it isn't configured properly.
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