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 ·

blog.jonathanlau.io

https://blog.jonathanlau.io/

100 92 96 100 –CWV 1AXE

Data from Aug 20, 2026, 3:52 PM UTC — 27h old.

Built Awesome · 1 measurement · since Aug 20, 2026 · last attempt 27h

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.

Eleventy Built with Eleventy
Netlify Hosted by Netlify

Scores

100
Performance
no change
92
Accessibility
no change
96
Best Practices
no change
100
SEO
no change

Lab metrics Lighthouse, mobile

Metric Current Previous Change Best Worst Trend
LCP Largest Contentful Paint 1.04 s — — 1.04 s 1.04 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 0 ms — — 0 ms 0 ms
FCP First Contentful Paint 1.04 s — — 1.04 s 1.04 s
Speed Index 1.04 s — — 1.04 s 1.04 s
TTFB Time to First Byte 826 ms — — 826 ms 826 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 139 ms
time to first byte 131 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 76.3 kB — — 76.3 kB 76.3 kB
Requests 10 — — 10 10
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 59.8 kB · 2 req
document 8.0 kB · 1 req
other 3.1 kB · 2 req
image 2.9 kB · 3 req
script 2.4 kB · 2 req

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 299 ms — — 299 ms 299 ms
Long Tasks 0 — — 0 0
DOM Elements 137 — — 137 137
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset 1 — — 1 1
A11y Failures 1 — — 1 1
A11y Failing Nodes 2 — — 2 2

Main thread work

other 121 ms
style layout 114 ms
script evaluation 31 ms
paint composite render 17 ms
parse HTML 13 ms
script parse compile 3 ms

Axe violations axe-core 4.13.0, full rule set

1 violating node across 1 rule, 277 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.

  • minor image-redundant-alt — Alternative text of images should not be repeated as text 1 node

Accessibility failures 1 of 14 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.

  • target-size — Touch targets do not have sufficient size or spacing. 2 nodes

Hygiene

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

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2 1 console error

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, 3:52 PM UTC 100 1.04 s 0 0 ms 76.3 kB 3/3 ±1 2,344 21.8s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show blog.jonathanlau.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://blog.jonathanlau.io/"></speedlify-score>