[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Time](https://evolu.dev/docs/api-reference/common/Time) › performanceDurationBetween

```ts
function performanceDurationBetween(
  start: PerformanceTime,
  end: PerformanceTime,
): PerformanceDuration;
```

Defined in: [packages/common/src/Time.ts:375](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Time.ts#L375)

Returns the elapsed fractional milliseconds between two performance times.

Throws if `end` precedes `start`.