I’ve created performance-mark-metadata. This library provide performance.mark with custom meta data.

This library inspired by User Timing API Level 3 proposal. This proposal will add details as metadata to performance.mark.

Currently, Performance.mark() API can not add metadata to marking.

Supports

Old browser need to Performance.mark() polyfill.

• nicjansma/usertiming.js: UserTiming polyfill

Install

Install with npm:

npm install performance-mark-metadata

Example

Usage in Node.js

Node.js 8.5.0 introduce perf_hooks module. You can use this library by passing require("perf_hooks").performance to PerformanceMetadataMarker constructor arguments.

UseCase

This example show actual usage.

• See https://azu.github.io/performance-mark-metadata

You want to found performance problem on viewing the site. You can analyze the problem by using performance-mark-metadata.

It is useful for Real user monitoring(RUM). In development, you can use browser’s development tools, but it is difficult about RUM.

Mark points

• Mark current Frame Per Seconds(FPS)
• Mark each action like “onClick”

Record FPS

and record action

After that, you can get FPS and action logs.

Analytics

You can get the log data and analyze the log data.

For example, visualize the log data by using C3.js.

You can found the relationship between “FPS” and “Heavy Task”. As a result, You can found that the performance problem is caused by “Heavy Task”.

• Example: https://azu.github.io/performance-mark-metadata/
• Repository: azu/performance-mark-metadata: performance.mark with custom meta data.

Welcome to ⭐️ and Pull Request!