Faster Mobx

MobX is a state management library designed to notify observers of changes to an observable object's state.

However, the observable function of MobX has performance issues when handling large amounts of objects with many properties.

To address this issue, the faster-mobx library has been developed, providing a 50-500x faster observable implementation of MobX that can be used as a drop in replacement.

Features

• [x] observable
• [x] makeObservable
• [x] autorun
• [x] reaction
• [x] runInAction (with async support)
• [x] observer (React support)
• [x] observable.map
• [ ] computed
• [ ] action
• [ ] toJS
• [ ] trace

Installation

# with npm
npm i faster-mobx

# with yarn
yarn add faster-mobx

# with pnpm
pnpm add faster-mobx

Usage

import { observable, autorun, makeObservable } from "faster-mobx";

const data = observable({
	name: "John",
	age: 20,
});

autorun(() => {
	console.log(data.name);
});

data.name = "Jane";

// with classes

class User {
	name = "John";
	age = 20;

	constructor() {
		// all properties will be observable
		// if you extend this class, you MUST NOT call makeObservable again in the child class
		// the return is important to make it reactive
		return makeObservable(this);
	}
}

Benchmark

Benchmark was done using benchmark.js on a 3.20GHz CPU with one thread.

Function	Mobx	Faster Mobx	Speedup
observable	570k ops/sec	33M ops/sec	58x
makeObservable (1 property)	750k ops/sec	33M ops/sec	44x
makeObservable (26 properties)	54k ops/sec	33M ops/sec	611x
autorun	12M ops/sec	6M ops/sec	0.5x
get	23M ops/sec	55M ops/sec	2.4x
set	19M ops/sec	30M ops/sec	1.6x

You can run the benchmark yourself by cloning the repo and running the following commands:

git clone https://github.com/trantlabs/faster-mobx
cd faster-mobx
npm install
npm run benchmark