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https://github.com/jondot/react-native-slowlog

A high-performance timer based profiler for React Native that helps you track big performance problems.
https://github.com/jondot/react-native-slowlog

debugging infrastructure performance react-native tools

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A high-performance timer based profiler for React Native that helps you track big performance problems.

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# Slowlog



A high-performance timer for React Native that helps you track big performance problems.

Use it as a first line of defense, before tools like system trace and perftools.



![](shot.png)



## Quickstart



In your React Native project run:



`$ npm i -S react-native-slowlog`



This is added as a runtime dependency, and `slowlog` will only run in developer mode (using the `__DEV__` flag).



To use `slowlog` apply it to your component this way:



```javascript

class Master extends Component {

  constructor(props){

    super(props)

    slowlog(this, /.*/)



    this.state = this.getDataSource(props)

    this.shouldComponentUpdate = shouldComponentUpdate.bind(this)

  }

...

}

```



## Options



You can apply `slowlog` differently based on your needs:



```javascript

slowlog([this], [regex matching methods], { verbose: false, threshold: 16, log: console, excludes: [dict of excluded methods] })

```



* `verbose` - will output all timing information to console, and just slow operations to yellowbox

* `threshold` - in milliseconds. Anything above that goes to yellowbox

* `log` - a `console`-like object. Anything that responds to `.log([msg])` and `.warn([msg])`

* `excludes` - a dict containing an exclusion list, like so {foobar:true, constructor:true} and so on. If you change this, remember to always

include `constructor`



# Contributing



Fork, implement, add tests, pull request, get my everlasting thanks and a respectable place here :).



# Copyright



Copyright (c) 2016 [Dotan Nahum](http://gplus.to/dotan) [@jondot](http://twitter.com/jondot). See [LICENSE](LICENSE.txt) for further details.