> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# With Ttft • Rust AI Agent SDK

> with_ttft: Set TTFT.

# with\_ttft

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  <Badge color="purple">Method</Badge>
</div>

> This is a method of the [**PerformanceMetrics**](../classes/PerformanceMetrics) class in the [**eval**](../modules/eval) module.

Set TTFT.

## Signature

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def with_ttft(mut self, ttft: Duration) -> Self
```

## Parameters

<ParamField query="ttft" type="Duration" required={true}>
  No description available.
</ParamField>

### Returns

<ResponseField name="Returns" type="Self">
  The result of the operation.
</ResponseField>