voluptasmollitia/docs-exp/performance.performancetrace.start.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/performance](./performance.md) &gt; [PerformanceTrace](./performance.performancetrace.md) &gt; [start](./performance.performancetrace.start.md)

## PerformanceTrace.start() method

Starts the timing for the trace instance.

<b>Signature:</b>

```typescript
start(): void;
```
<b>Returns:</b>

void