speedlify2

Lighthouse lab metrics and Chrome UX Report field data for a list of sites, recorded on every run and compared over time.

Measurement runs · Embed a score · Field data from the Chrome UX Report ·

colorjs.io

https://colorjs.io/

93 66 100 73 –CWV 27AXE

Data from Aug 20, 2026, 4:40 PM UTC — 26h old.

Built Awesome · 1 measurement · since Aug 20, 2026 · last attempt 26h

Stack

Detected on the same page load as the accessibility pass — the generator from <meta name="generator"> or the shape of the page, the host from response headers.

Netlify Hosted by Netlify

Scores

93
Performance
no change
66
Accessibility
no change
100
Best Practices
no change
73
SEO
no change

Lab metrics Lighthouse, mobile

Metric Current Previous Change Best Worst Trend
LCP Largest Contentful Paint 2.79 s — — 2.79 s 2.79 s
CLS Cumulative Layout Shift 0.046 — — 0.046 0.046
TBT Total Blocking Time 11 ms — — 11 ms 11 ms
FCP First Contentful Paint 2.19 s — — 2.19 s 2.19 s
Speed Index 2.19 s — — 2.19 s 2.19 s
TTFB Time to First Byte 639 ms — — 639 ms 639 ms

What LCP is made of

A flat LCP number tells you something regressed. The subparts tell you whether it was the server, resource discovery, the download, or rendering.

element render delay 149 ms
time to first byte 32 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 383.9 kB — — 383.9 kB 383.9 kB
Requests 161 — — 161 161
Third-party Weight 219.5 kB — — 219.5 kB 219.5 kB
Third-party CPU 0 ms — — 0 ms 0 ms
Unused JS 42.6 kB — — 42.6 kB 42.6 kB
Unused CSS 0 B — — 0 B 0 B

By resource type

script 240.2 kB · 140 req
font 104.1 kB · 3 req
image 25.3 kB · 8 req
stylesheet 8.8 kB · 8 req
document 5.5 kB · 1 req
other 73 B · 1 req
third party 219.5 kB · 33 req

Third parties 7 entities

219.5 kB transferred, 0 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

Google Fonts 105.4 kB · 0 ms CPU
JSDelivr CDN 70.2 kB · 0 ms CPU
blissfuljs.com 14.1 kB · 0 ms CPU
opencollective.com 12.1 kB · 0 ms CPU
prismjs.com 10.1 kB · 0 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 2.05 s — — 2.05 s 2.05 s
Long Tasks 2 — — 2 2
DOM Elements 908 — — 908 908
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset 27 — — 27 27
A11y Failures 5 — — 5 5
A11y Failing Nodes 28 — — 28 28

Main thread work

other 943 ms
paint composite render 563 ms
style layout 387 ms
script evaluation 109 ms
parse HTML 18 ms
script parse compile 14 ms
garbage collection 13 ms

Axe violations axe-core 4.13.0, full rule set

27 violating nodes across 7 rules, 1169 passing. This is a standalone axe run, stricter than the subset Lighthouse folds into its score above — and it is the second tiebreaker in the ranking.

  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 19 nodes
  • serious scrollable-region-focusable — Scrollable region must have keyboard access 3 nodes
  • moderate heading-order — Heading levels should only increase by one 1 node
  • serious html-has-lang — <html> element must have a lang attribute 1 node
  • critical image-alt — Images must have alternative text 1 node
  • moderate landmark-unique — Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 1 node
  • serious link-name — Links must have discernible text 1 node

Accessibility failures 5 of 18 audits

Tracked as a count, not just the score — the weighted score is coarse enough that you can ship a broken component and barely move it.

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 24 nodes
  • heading-order — Heading elements are not in a sequentially-descending order 1 node
  • html-has-lang — `<html>` element does not have a `[lang]` attribute 1 node
  • image-alt — Image elements do not have `[alt]` attributes 1 node
  • link-name — Links do not have a discernible name 1 node

Hygiene

Changes rarely — which is exactly why a change is worth noticing.

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Every stored run for this URL, newest first. Failures are kept as records — "this site was down on Tuesday" is data too.

When PerfLCPCLSTBTWeight RunsSpreadBenchTook
Aug 20, 2026, 4:40 PM UTC 93 2.79 s 0.046 11 ms 383.9 kB 3/3 ±24 3,329 33.2s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show colorjs.io's scores, updated whenever this instance re-measures — more about the component. Don’t forget to bundle the speedlify-score.js component code into your site! 

<speedlify-score speedlify-url="https://zachleat.github.io/speedlify2/" url="https://colorjs.io/"></speedlify-score>