title: How to Fix Window Freezing and UI Stutter in macOS Tahoe 26.2

description: Fix the issue in macOS Tahoe 26.2 where app windows freeze or basic functions like text copying experience lag and UI stutter.

category: System

How to Fix Window Freezing and UI Stutter in macOS Tahoe 26.2

Despite the speed improvements in macOS Tahoe, version 26.2 has introduced a "UI Stutter" bug. Users report that app windows randomly freeze for 2-3 seconds, and even basic functions—like copying text or dragging icons—experience noticeable lag.

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Method 1: Restart the WindowServer Process

The WindowServer manages the graphical interface. If it develops a leak or hang, the UI will stutter.

1. Open Activity Monitor (Command + Space, type "Activity Monitor").
2. Search for WindowServer.
3. Select it and click the X button at the top.
4. Select Force Quit. (Note: This will log you out and close all apps, so save your work first).

Method 2: Disable Stage Manager Previews

Stage Manager in 26.2 is a frequent source of UI lag due to the way it handles window miniatures.

1. Go to System Settings > Desktop & Dock.
2. Click Customize under Stage Manager.
3. Toggle off "Show Recent Apps".
4. Test to see if the UI stutter improves.

Method 3: Reset the Pasteboard (for Text Copy Lag)

If you specifically experience lag when copying text, the pboard daemon may be stuck.

1. Open Terminal.
2. Run the following command:

killall pboard

Method 4: Reduce Motion and Transparency

If your Mac is struggling with the new transparency effects in Tahoe, reducing the graphical load can stop the stuttering.

1. Go to System Settings > Accessibility > Display.
2. Toggle ON "Reduce motion" and "Reduce transparency".