How to Clear the macOS Core Animation Cache via Terminal

The Engine Behind the Polish

One of the defining features of macOS is its incredibly smooth, fluid user interface. Every time you minimize a window, swipe between full-screen applications, or open Launchpad, you are triggering a hardware-accelerated graphics sequence. This visual fluidity is handled by a foundational graphics framework called Core Animation.

To ensure these animations run at a flawless 60 frames per second without lagging the CPU, macOS heavily caches rendered UI elements in a hidden system directory. However, if this cache becomes corrupted, the system UI will begin to stutter severely. You might notice heavy lag when resizing windows, graphical tearing when opening folders, or transparent visual artifacts remaining stuck on your desktop.

To resolve these graphical anomalies, you must forcefully purge the Core Animation cache using the Terminal.

Locating the Cache Directory

Because Core Animation operates deep within the WindowServer process, its caches are not stored in the standard user directories. They are stored in the secure Darwin temporary directories.

The specific cache directory is located at: /private/var/folders/*/com.apple.opengl/

(Note: Even on modern Apple Silicon Macs that utilize the Metal API, legacy cache architectures often still utilize the opengl naming convention for backward compatibility).

Purging the Cache via Terminal

Because these folders are owned by the system, you must use the Terminal with elevated administrator privileges.

1. Save any open work and close all non-essential applications, as this process will temporarily disrupt the window manager.
2. Open the Terminal application.
3. Execute the following command to forcefully remove the cache files:

sudo rm -rf /private/var/folders/*/*/*/com.apple.opengl

Press Enter, type your Mac’s administrator password, and press Enter again.

Warning: Using wildcard asterisks (*) with the rm -rf command is incredibly dangerous if typed incorrectly. Ensure you have typed the path exactly as written before pressing Enter. This specific path ensures the cache is wiped for all active user profiles.

Restarting the WindowServer

Deleting the files from the hard drive does not immediately fix the stuttering, because the active WindowServer process is still holding the corrupted graphics data in its active RAM.

You must forcefully terminate the WindowServer daemon.

sudo killall WindowServer

CRITICAL WARNING: The moment you press Enter on this command, your Mac screen will instantly go black. You will be immediately logged out of your macOS session. Any unsaved documents will be lost.

Within three to five seconds, the macOS login screen will reappear. The system has automatically respawned a fresh, clean instance of the WindowServer process. When you log back in, the kernel will generate a brand-new Core Animation cache architecture, restoring the fluid, stutter-free performance to the macOS user interface.