# addyosmani/timing.js

Navigation Timing API measurement helpers

Repository: https://github.com/addyosmani/timing.js
Canonical: https://ross.abutalabs.com/products/timingjs
Language: JavaScript
License Family: other
Last push: 2020-04-02T05:05:27+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4364, "days_push": 2344, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1478, forks 111 (observed 2026-08-28T04:04:50.519958+00:00)

## What it is
A small JavaScript library of helpers for the Navigation Timing API that measures where a web page spends its time loading. It normalizes firstPaint across browsers and exposes computed metrics like domReadyTime and loadTime via a simple API or console tables.

## Use cases
- measure page load performance in the browser
- get first paint time across Chrome, Firefox and IE
- print a table of navigation timing metrics in DevTools
- find out how long DNS, connect and request phases take
- use as a bookmarklet to audit any page's load timing

## When to choose
- you need quick browser page-load timing metrics without a full RUM solution
- you want a tiny standalone script, DevTools snippet or bookmarklet for performance auditing

## When to avoid
- you need modern PerformanceObserver or User Timing based metrics
- you need continuous real-user monitoring or production analytics
- you need long-term maintained support — the project has seen little activity since 2020

## Facets
- artifact type: library
- maturity: maintenance
- function: developer-tools, monitoring, analytics
- domain: web-development, frontend, performance, developer-tools
- platform: browser
- tags: navigation-timing, performance-metrics, page-load, bookmarklet, devtools, javascript

## Member repositories
- addyosmani/timing.js (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:50.519958+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:34:20.762560+00:00, confidence not recorded.
  - readme: https://github.com/addyosmani/timing.js (fetched 2026-08-28T04:04:50.519958+00:00, sha 2c8e3ba37a9e)
  - registry_npm: https://registry.npmjs.org/timing.js (fetched 2026-08-29T11:41:36.054075+00:00, sha 306215ef8e7f)
- Data as of 2026-08-30T08:39:29.467469+00:00.