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# optimizeContents(forCPUAccess:slice:level:)

Encodes a command that modifies the contents of a texture to improve the performance of CPU accesses
to its contents in a specific region.

```
func optimizeContents(forCPUAccess texture: any MTLTexture, slice: Int, level: Int)
```

## Parameters

`texture`

A [`MTLTexture`](/documentation/Metal/MTLTexture) the command optimizes for CPU access.

`slice`

A slice within `texture`.

`level`

A mipmap level within `texture`.

## Discussion

Optimizing a texture for CPU access may affect the performance of GPU accesses, however, the data the GPU
retrieves from the texture remains consistent.

You typically use this command for:

- Textures the CPU accesses for an extended period of time.
- Textures with a [`storageMode`](/documentation/Metal/MTLTextureDescriptor/storageMode) property that’s [`MTLStorageMode.shared`](/documentation/Metal/MTLStorageMode/shared) or
  [`MTLStorageMode.managed`](/documentation/Metal/MTLStorageMode/managed).

---

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