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Jun 13, 2019
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docs(performance): Adding information on polyfilling FID #2096

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docs(performance): Adding information on polyfilling FID
jamesdaniels Jun 1, 2019
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Merge branch 'master' into jamesdaniels-patch-1
jamesdaniels Jun 13, 2019
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12 changes: 11 additions & 1 deletion docs/performance/getting-started.md
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Expand Up @@ -32,6 +32,16 @@ The page load trace breaks down into the following default metrics:
* [first input delay traces](https://firebase.google.com/docs/perf-mon/automatic-web#input-delay) — measure the time between when the user interacts with a page and when the browser is able to respond to that input
* **Angular specific traces** - measure the time needed for `ApplicationRef.isStable` to be true, an important metric to track if you're concerned about solving Zone.js issues for proper functionality of NGSW and Server Side Rendering

### Measuring First Input Delay

> First Input Delay (FID) measures the time from when a user first interacts with your site (i.e. when they click a link, tap on a button, or use a custom, JavaScript-powered control) to the time when the browser is actually able to respond to that interaction. [See the article on the Google Developer's Blog for more information on FID.](https://developers.google.com/web/updates/2018/05/first-input-delay)

In order to track first input delay, you'll want to [polyfill the browser performance API](https://github.com/GoogleChromeLabs/first-input-delay):

`npm install --save-dev first-input-delay`

Then add `import 'first-input-delay';` to your `src/polyfills.ts`.

## Manual traces

You can inject `AngularFirePerformance` to perform manual traces on Observables.
Expand Down Expand Up @@ -162,4 +172,4 @@ this.articles = afs.collection('articles')
}),
share()
);
```
```