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What is wired memory on a Mac?

It is the one category in Activity Monitor with no owner, no process to quit, and almost nothing you can do about it. Which is worth knowing before you try.

Last updated September 11, 2026 · by the RAMKeeper team

Apple's definition is one sentence: wired memory is memory required by the system that "can't be cached and must stay in RAM, so it's not available to other apps."

That is accurate and it leaves out the part people are actually asking about, which is usually some version of: it is several gigabytes, which app is doing that, and can I make it stop.

The number has no row in the process list

Here is the measurement that makes this concrete. On the machine these guides are measured on, at 11 September 2026:

• Wired memory: 12.1 GB of 64 GB installed, about 19%.
• kernel_task, the process people expect to be responsible, reported 21 MB.

Those are not in conflict and neither is a bug. Wired memory is held by the kernel and by drivers on behalf of the whole system, and it is not accounted to a process the way an app's memory is. Sorting Activity Monitor by the Memory column will never show you where it went, and /usr/bin/footprint does not break it out either: its per-process columns are dirty, clean and reclaimable, with no wired category at all.

So the first practical answer is: stop looking for the app responsible. There usually is not one.

App memory vs wired memory

How to see yours

vm_stat | grep "Pages wired down"

Multiply that page count by the page size printed at the top of vm_stat output (16384 bytes on Apple silicon, 4096 on Intel). Or read it directly in Activity Monitor's Memory tab, at the bottom of the window.

It is not a constant. Two readings on the same machine a few hours apart on the same day gave 12.4 GB and 12.1 GB, with nothing deliberately started or stopped in between.

Can you reduce it?

Mostly no, and the honest version of this answer has three parts.

1. There is no setting, command or app that lowers wired memory. Anything claiming to free it is either not doing what it says or is describing a different category. Wired pages are wired precisely because the system cannot give them up on demand.
2. The indirect levers are hardware and drivers, not habits. What asks for non-pageable memory is kernel-side: drivers, virtualisation, some security agents, some external hardware. If you run a virtual machine or a corporate endpoint agent, that shows up here and closing browser tabs will not touch it.
3. A restart resets it to the machine's baseline, which is the only reliable action available, and it is worth doing only if the figure has grown far past what that machine normally shows.

When wired memory actually matters

Two situations, and they are different problems.

It is a fixed tax, and a fixed tax hurts a small machine more. On the 64 GB machine measured above, 12.1 GB of wired memory left plenty for everything else. The same class of cost on a much smaller Mac is a far larger share of what you paid for, which is one reason the gap between an 8 GB and a 24 GB machine feels bigger in use than the spec difference suggests. Measure yours before assuming which side of that you are on: the three readings are here.

Unusually high wired memory is a symptom, not a cause. If your machine's figure is far above its own normal, the thing to investigate is what changed: a new driver, a security agent, a virtual machine left running, an external device. Chasing the number itself gets you nowhere, because there is nothing at the other end of it to quit.

And if what actually prompted this question was your Mac feeling slow, wired memory is probably not the reason. The figure that tracks whether memory is keeping up is pressure, not any of the individual categories: see what each figure in the Memory tab means, or a full reading from one machine with the commands attached.

The short version

• Wired memory cannot be compressed or swapped. That is the whole definition.
• It belongs to the kernel and drivers, so no process in Activity Monitor accounts for it.
• On the measured machine it was 12.1 GB while kernel_task reported 21 MB.
• Nothing you install can reduce it. A restart returns it to that machine's baseline.
• If your Mac is slow, look at memory pressure instead.

Disclosure: published by RAMKeeper, which sells a Mac memory tool. RAMKeeper does not reduce wired memory either, and nothing else does. Every figure here came from vm_stat and top, on 11 September 2026.