> For the complete documentation index, see [llms.txt](https://docs.timeinpixels.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.timeinpixels.com/nobe-omniscope/settings-and-preferences/performance-settings.md).

# Performance settings

The **Performance** tab in Preferences controls how OmniScope balances visual quality against GPU and CPU resources. Open it via **Preferences > Performance**.

<figure><img src="/files/vpLNtMrg2nhlQgZdJOvC" alt=""><figcaption><p>Preferences — Performance tab</p></figcaption></figure>

## Rendering

### Signal Preprocessing

These options trade detail for responsiveness before scopes ingest the signal.

| Setting                                      | Description                                                                                                                                        |
| -------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Limit input to 1080p**                     | Downsamples heavy scopes (Waveform, Vectorscope, CIE Plot, 3D Cube) to 1080p before processing. Recommended for 4K+ sources on mid-range hardware. |
| **Use high precision calculation**           | Switches the internal pipeline from 16-bit half-float to 32-bit float math for maximum accuracy. **Requires restart.**                             |
| **Input frame reordering based on timecode** | Re-orders frames based on their embedded timecode when input sources deliver them out of sequence.                                                 |

### Frame Cache & Buffering

Balances GPU memory usage against playback smoothness, especially at high frame rates.

| GPU Cache Level                 | Frame Buffer Size | Notes                                       |
| ------------------------------- | ----------------- | ------------------------------------------- |
| Low memory                      | 4 frames          | Minimal GPU memory footprint                |
| Medium Memory & better HFR perf | 8 frames          | Default — good balance for most workflows   |
| High Memory & best HFR perf     | 16 frames         | Best for high-frame-rate sources (120 fps+) |

Changing this setting requires **restarting the video source** to take effect.

### Scope Sampling

| Setting                     | Description                                                                                                                                                                                                                      |
| --------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Global scope downsample** | Applies a global resolution scale to every scope. Options: **100%**, **75%**, **50%**, **25%**, **10%**. Lower values reduce fidelity but save considerable GPU time. Individual scopes can override this in their own settings. |

### Uploads & CPU Scaling

| Setting                                  | Description                                                                                                            |
| ---------------------------------------- | ---------------------------------------------------------------------------------------------------------------------- |
| **Optimize scope resolution**            | Renders all scopes at 75% of their display size, reducing GPU workload with minimal visual impact.                     |
| **Use Lanczos filtering for downsample** | Uses higher-quality Lanczos filtering when downsampling scopes. Produces sharper results at a slight performance cost. |

{% hint style="info" %}
Hold **Shift** while the Performance tab is open to reveal additional developer options in this section.
{% endhint %}

## GPU

### UI Renderer

| Setting             | Description                                                                                                                                                                                                              |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **UI refresh rate** | Caps the UI thread redraw rate. Options: **30 Hz**, **60 Hz**, **120 Hz**, **144 Hz**, **240 Hz**. Higher values produce a smoother interface but increase CPU and GPU load. Default is **60 Hz**. **Requires restart.** |

### macOS-Specific

| Setting               | Description                                                                                                                                          |
| --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Metal GPU capture** | Enables Apple GPU capture tooling for debugging Metal shader issues. Only useful for development or when requested by support. **Requires restart.** |
| **Active GPU**        | On systems with multiple GPUs, selects which Metal device OmniScope uses. Visible only when more than one GPU is detected. **Requires restart.**     |

### Windows: Prefer the Discrete GPU

On systems with both integrated and discrete graphics, OmniScope should run on the **high-performance** GPU. In Windows, set this in **Settings > System > Display > Graphics**, then restart OmniScope.

### Windows-Specific

| Setting                           | Description                                                                                                                      |
| --------------------------------- | -------------------------------------------------------------------------------------------------------------------------------- |
| **Use GPU compute acceleration**  | Switches between CPU and GPU (OpenCL) compute pipelines. Disable if you experience OpenCL-related crashes. **Requires restart.** |
| **Use GLSL compute if available** | Prefers GLSL compute shaders over OpenCL when the GPU supports them. Can improve performance on some NVIDIA and AMD cards.       |

{% hint style="info" %}
Hold **Shift** while the GPU section is open to reveal additional developer toggles.
{% endhint %}