Updated November 2026 · 4 min read

Memory Compression in Windows 11: Normal or a Problem?

You open Task Manager and see a process called Memory Compression using a few hundred megabytes. It is not malware, and it is not a leak. Here is what it does and when it is worth investigating.

What it does

When physical memory gets tight, Windows compresses pages that are not actively used and keeps them in RAM instead of writing them to the page file. Reading compressed data from RAM is much faster than reading from disk, so compression reduces paging and keeps the system responsive.

The process size reflects the compressed data it is holding. A few hundred MB is normal, especially with browsers and chat apps open.

Why you should not "end" it

Ending the Memory Compression process does not free memory in a useful way; Windows will restart it and may have to page more data to disk. It is a system mechanism, not an app you can close for a benefit.

When high usage is worth a look

Constant growth over days, even when idle, together with low available memory.
Heavy paging: disk activity near 100% despite compression. This suggests you are genuinely short on RAM.
Other system processes (non-paged pool) growing instead — that is a driver issue, not compression.

In those cases, check what is using memory, update drivers, and consider more RAM. Clearing compression is not a fix.

How to check the real numbers

Task Manager → Performance → Memory: Available, Committed, Cached.
Resource Monitor → Memory: In Use, Modified, Standby, Free.
Task Manager → Details: sort by memory to find the actual app driving pressure.

If you need relief without closing apps

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FAQ

Is Memory Compression a virus?

No. It is a built-in Windows process. If you see a suspiciously named copy in a user folder, scan it, but the system process itself is legitimate.

Can I disable memory compression?

There are PowerShell commands to disable it, but it is not recommended: you may get more disk paging and worse responsiveness.

Does it use CPU?

Compression and decompression cost some CPU, but usually far less than the disk I/O it avoids.