How to Fix Desktop Window Manager High Memory Usage on Windows

What Causes This?

Desktop Window Manager (dwm.exe) handles visual effects like transparency, animations, thumbnails, and scaling in Windows. High memory usage usually happens when graphics drivers are outdated, too many apps and windows are open, visual effects are overloading the system, or a buggy app is causing repeated redraws. In some cases, memory leaks from display drivers, browsers, or multi-monitor setups can make Desktop Window Manager use more RAM than it should.

Common Symptoms

• Desktop Window Manager shows unusually high memory usage in Task Manager
• Windows feels slow when switching apps or moving windows
• High RAM usage after connecting a second monitor or changing display settings
• Lag, stuttering, or screen flickering during normal desktop use
• Memory usage keeps climbing the longer the PC stays on

How to Fix It Manually

1. Check Desktop Window Manager usage in Task Manager

   1. Press Ctrl + Shift + Esc to open Task Manager.
   2. Click More details if Task Manager opens in compact view.
   3. On the Processes tab, find Desktop Window Manager and check its Memory usage.
   4. Also look for apps using a lot of memory or GPU, especially browsers, video apps, and overlay tools.

2. Restart Windows Explorer and sign out if needed

   1. In Task Manager, scroll down to Windows Explorer.
   2. Right-click it and choose Restart.
   3. If memory usage stays high, click Start > your profile icon > Sign out, then sign back in.
   4. This clears temporary desktop and shell issues without a full reinstall or deeper repair.

3. Turn off unnecessary visual effects

   1. Press Windows + I to open Settings.
   2. Go to Accessibility > Visual effects.
   3. Turn Animation effects Off.
   4. Turn Transparency effects Off.
   5. Then go to System > About > Advanced system settings.
   6. Under Performance, click Settings and choose Adjust for best performance, or disable effects like window animations and shadows manually.

4. Update or reinstall your graphics driver

   1. Right-click Start and choose Device Manager.
   2. Expand Display adapters.
   3. Right-click your GPU and select Update driver.
   4. Choose Search automatically for drivers.
   5. If the problem started after a driver update, open Properties > Driver and click Roll Back Driver if available.
   6. For best results, install the latest driver directly from NVIDIA, AMD, or Intel.

5. Check display settings and external monitors

   1. Open Settings > System > Display.
   2. Lower the Display resolution temporarily if you use a high-resolution monitor.
   3. Disconnect extra monitors and see if memory usage drops.
   4. If you use HDR, variable refresh rate, or custom scaling, disable them one at a time to test.

6. Disable apps that hook into the desktop

   1. Close apps with overlays or visual hooks, such as screen recorders, RGB tools, wallpaper apps, and game launchers.
   2. Press Ctrl + Shift + Esc, open the Startup apps tab, and disable non-essential startup programs.
   3. Restart your PC and check whether dwm.exe memory use returns to normal.

7. Install Windows updates

   1. Open Settings > Windows Update.
   2. Click Check for updates.
   3. Install all available updates, including optional driver or feature updates if relevant.
   4. Restart your PC after installation.

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