So, in addition to regular memory known as RAM, Microsoft Windows also utilizes virtual paging file memory (Superfetch) or compressed memory (SysMain.)Īs previously mentioned, Superfetch and SysMain are basically the same things, but SysMain was introduced in Windows 10 and is a better alternative to the paging file, improving overall performance. This virtual memory type made it possible to launch and run resource-intensive applications, though they worked noticeably slower. Before Windows 8.1, if an application needed more RAM than a computer physically had, then the data that couldn’t be loaded to the RAM was sent to the paging file, which is on the hard drive. SysMain was designed to preload applications to all available (unused) RAM space. Service Host includes many other services, such as Local System (Network Restricted), Local Service, Network Service, Windows Update, and so on. SysMain is part of the Service Host bundle of services. In short, SysMain analyzes your application usage patterns and optimizes program launching. So a 2GB package can be compressed into a 1GB package. So, after Windows 10 version 1809, when the system needed more memory than was available, instead of sending data to the paging file on the hard disk, it compressed the data. In the Windows 10 update 1809, Microsoft replaced the Superfetch service with SysMain. Page file memory was first introduced in Windows Vista under the name Superfetch. When there’s not enough RAM, programs that need it may access virtual memory found on the hard disk. Virtual memory space is reserved on the hard disk, which allows loading memory and storing information. In addition to RAM, Windows also has a paging file (virtual memory). This article will help you address this issue by providing you with ways to fix SysMain high disk usage. Many people have noticed that SysMain uses way more disk resources than it normally should, making their computers run considerably slower.
But this service was replaced with a service called SysMain, which is the same service but with a new name.
Previously, many Windows 10 users had issues with the Superfetch service causing high disk usage. Service Host SysMain causing 100% disk usage? Find out how to fix that
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