Troubleshooting
Windows 11 High Memory Usage: Find the Cause and Fix It
Written by Windows 11 Field Guide Editorial Team · Updated
Opening Task Manager and seeing memory at 80 or 90 percent is alarming, but it is not always a problem. Windows 11 deliberately keeps recently used data in RAM, because unused memory is wasted memory. Windows 11 high memory usage becomes a real problem when the PC slows down, the disk starts working constantly, or apps crash or refuse to open. This guide explains how to tell the difference, find the app responsible, and fix the common causes without “RAM booster” tools.
The steps apply to Windows 11 version 24H2, 25H2 and 26H2.
Is it actually a problem?
Signs that memory is genuinely short:
- Switching between apps is sluggish and the PC pauses.
- The disk light or Task Manager’s Disk column is busy while you are not doing much, because Windows is paging memory to disk.
- Browsers reload tabs when you switch back to them.
- Apps warn about low memory or crash.
If none of this happens, high usage is just Windows making good use of RAM. Memory used for caching is handed back immediately when an app needs it.
Find what is using memory
- Press Ctrl+Shift+Esc to open Task Manager.
- On Processes, select the Memory column header to sort by memory use.
- Expand groups such as your browser to see individual tabs and extensions.
Then open Performance > Memory for the overall picture:
| Field | What it tells you |
|---|---|
| In use | Memory actively used by apps and Windows |
| Committed | Memory promised to apps, including what is in the page file; if this approaches the limit, you are really short |
| Cached | Data kept for speed; released when needed |
| Speed, slots used, form factor | Useful when planning an upgrade |
Our check PC specs in Windows 11 guide shows other places to see how much RAM is installed.
Common causes and fixes
Browsers with many tabs. Each tab and extension uses memory. Close tabs you are not using, remove extensions you do not need, and use the browser’s own sleeping-tabs or memory-saver feature if it has one.
One app growing over time (a memory leak). If an app’s memory climbs steadily for hours, it is leaking. Restart the app to release the memory now, then check for an update; leaks are bugs only the developer can fix. Restarting the PC once a day is a reasonable workaround meanwhile.
Too many startup apps. Apps that start with Windows sit in memory all day. Go to Settings > Apps > Startup and turn off those you do not need straight away. Microsoft’s startup apps page explains the impact ratings. See Windows 11 startup apps.
Games and creative apps. Games, video editors and virtual machines legitimately use a lot of memory. Close other apps while using them.
Outdated drivers. A faulty driver can leak memory that shows up under System rather than an app. Install updates from Settings > Windows Update, including optional driver updates, and current graphics drivers; see Windows 11 graphics drivers.
Malware. Unknown processes using lots of memory deserve a scan. Run a full scan in Windows Security; see Microsoft Defender in Windows 11.
Settings that help
- Restart regularly. Shut down or restart at least occasionally so memory starts fresh. Fast startup means a shutdown is not always a full restart, so use Restart when troubleshooting.
- Leave virtual memory alone. Windows manages the page file automatically. Turning it off or making it tiny can cause crashes when memory runs out.
- Use Efficiency mode for background apps. In Task Manager, right-click a background app process and select Efficiency mode to lower its priority. It reduces CPU impact more than memory, but helps keep the PC responsive.
Microsoft’s Tips to improve PC performance page also recommends checking for updates, restarting and closing unneeded apps before anything else.
Test the memory hardware
If high memory use comes with blue screens, random restarts or corrupted files, faulty RAM is possible:
- Save your work.
- Search for Windows Memory Diagnostic in Start and open it.
- Select Restart now and check for problems.
- The PC restarts, runs the test and shows the result after you sign in again.
Errors mean a RAM module needs replacing. See Windows 11 blue screen and Windows 11 random shutdown for related crashes.
Should you add more RAM?
Windows 11 requires 4 GB, but that is tight for a modern browser and office apps together. 8 GB is comfortable for everyday use and 16 GB for heavier multitasking or gaming. Check in Task Manager whether there are free slots; on many thin laptops memory is soldered and cannot be upgraded. Our RAM upgrade checklist covers the basics.
Check what starts in the background
Some memory use comes from things that never show a window. In Task Manager, scroll down the Processes list to Background processes: sync tools, updaters, game launchers and chat apps often sit here. Right-click and select Open file location if you do not recognise one, and uninstall software you no longer use from Settings > Apps > Installed apps.
Browser extensions deserve the same review: each one runs in the background of every browser window. Keep the few you rely on.
Avoid RAM cleaners
“Memory optimiser” apps force Windows to throw cached data out of RAM. The number in Task Manager drops, but Windows then has to reload that data from disk, so the PC often feels slower. They can also come bundled with unwanted software. Stick to the fixes above.
If the whole PC is slow rather than just memory being high, work through Windows 11 slow performance and Windows 11 high CPU usage.
Frequently asked questions
How much RAM does Windows 11 normally use?
It varies with the PC and apps. Windows keeps recently used data in memory to speed things up, so a fair share of RAM in use at idle is normal. Watch for slowdowns rather than a percentage.
Why is my memory usage at 90 percent or more?
Usually one or two apps, often a browser with many tabs, a game or an app with a memory leak. Sort Task Manager's Processes tab by Memory to find it.
What is a memory leak?
A bug where an app keeps claiming memory and does not release it, so its usage climbs over hours. Restarting the app frees the memory; an update from the developer fixes the cause.
Should I use a RAM cleaner app?
No. Windows manages memory itself. RAM cleaners force data out of memory, which often makes the PC slower afterwards.
Will adding more RAM help?
If you regularly fill memory with the apps you need, yes, on PCs where RAM can be upgraded. Many thin laptops have soldered memory that cannot be changed.
Sources
Windows 11 Field Guide Editorial Team
Editorial team
The Windows 11 Field Guide team writes and updates independent Windows 11 guides and checks each step against Microsoft's documentation and the current Settings app.
