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The SysMain service and the Memory Compression process are used to improve computer performance. System and Compressed Memory Process High CPU and RAM Usage

You can get information about this process using the Get-Process PowerShell cmdlet: In modern Windows builds (Win 10 20H2 and Windows 11), this functionality is separated into a separate Memory Compression process, which is hidden from the Task Manager. Originally, the process System and compressed memory was located inside the System process, which is not too convenient for troubleshooting.

If the Windows Memory Manager detects low memory, it tries to compress unused pages of memory instead of writing them to a paging file on disk to free up RAM for other processes. In this article, we will look at how to view compressed memory usage statistics in Windows, how to enable or disable RAM compression (if your computer is slow due to the high load of the Memory Compression process). Microsoft first introduced memory compression by the Memory Manager (MM) process in Windows 10 and Windows Server 2016.