# Is it safe to delete Unreal Engine’s DerivedDataCache on Mac?

- URL: https://moreroom.app/folders/unreal-ddc
- Item: Unreal Engine shared cache (DDC)
- Location: `~/Library/Application Support/Epic/UnrealEngine/Common/DerivedDataCache`
- Verdict: Safe to remove — Rebuilt or re-downloaded automatically when needed.
- Comes back on its own: yes
- Typical size: 5–100 GB
- Source: MoreRoom rules catalogue (2026-10-17), by Yando Pte. Ltd.

## What is it?

Unreal Engine stores its shared local Derived Data Cache in `~/Library/Application Support/Epic/UnrealEngine/Common/DerivedDataCache`: compiled shaders, cooked textures and other processed versions of assets for all your projects. Typically tens of GB.

## What happens if you delete it?

Unreal rebuilds what it needs when you open a project, which can take a long time for large projects, mostly spent compiling shaders. Your project files are not affected.

## How to remove it properly

Quit Unreal Editor and the Epic Games Launcher, then move the folder to the Trash in Finder (Go › Go to Folder… `~/Library/Application Support/Epic/UnrealEngine/Common/DerivedDataCache`).