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 ·

slides.oddbird.net

https://slides.oddbird.net/

100 88 100 100 –CWV 3AXE

Data from Aug 21, 2026, 7:45 AM UTC — 11h old.

Built Awesome · 1 measurement · since Aug 21, 2026 · last attempt 11h

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.

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Scores

100
Performance
no change
88
Accessibility
no change
100
Best Practices
no change
100
SEO
no change

Lab metrics Lighthouse, mobile

Metric Current Previous Change Best Worst Trend
LCP Largest Contentful Paint 1.83 s — — 1.83 s 1.83 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 0 ms — — 0 ms 0 ms
FCP First Contentful Paint 929 ms — — 929 ms 929 ms
Speed Index 929 ms — — 929 ms 929 ms
TTFB Time to First Byte 629 ms — — 629 ms 629 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 180 ms
time to first byte 30 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 236.9 kB — — 236.9 kB 236.9 kB
Requests 5 — — 5 5
Third-party Weight 0 B — — 0 B 0 B
Third-party CPU 0 ms — — 0 ms 0 ms
Unused JS 0 B — — 0 B 0 B
Unused CSS 0 B — — 0 B 0 B

By resource type

font 195.7 kB · 1 req
stylesheet 12.0 kB · 1 req
script 5.5 kB · 1 req
document 2.3 kB · 1 req

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 153 ms — — 153 ms 153 ms
Long Tasks 0 — — 0 0
DOM Elements 183 — — 183 183
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset 3 — — 3 3
A11y Failures 2 — — 2 2
A11y Failing Nodes 3 — — 3 3

Main thread work

other 63 ms
style layout 58 ms
script evaluation 15 ms
paint composite render 9 ms
parse HTML 7 ms
script parse compile 2 ms

Axe violations axe-core 4.13.0, full rule set

3 violating nodes across 2 rules, 376 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.

  • critical aria-valid-attr — ARIA attributes must conform to valid names 2 nodes
  • critical label — Form elements must have labels 1 node

Accessibility failures 2 of 22 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.

  • aria-valid-attr — `[aria-*]` attributes are not valid or misspelled 2 nodes
  • label — Form elements do not have associated labels 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 21, 2026, 7:45 AM UTC 100 1.83 s 0 0 ms 236.9 kB 3/3 ±0 4,442 20.6s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show slides.oddbird.net'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://slides.oddbird.net/"></speedlify-score>