Two small things noticed today. When calling `getDependencies` concurrently (which is happening right now) the cache doesn't work as it's after the `await`, so here we move it to cache the promise instead. Also `NUM_OF_MICROSEC_IN_SEC` isn't accurate and it should be `NANOSEC` actually.
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
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## Documentation / Examples
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- [ ] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)