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 ·

scottpdawson.com

https://scottpdawson.com/

Data from Aug 21, 2026, 6:44 AM UTC — 11h old.

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

This URL redirects to https://scottpdawson.substack.com/.

Lighthouse follows the redirect, so the numbers below describe the destination page, not this one. Not yet confirmed as a move; it needs to lead to the same place on several consecutive runs first.

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.

Cloudflare Hosted by Cloudflare

Scores

65
Performance
no change
93
Accessibility
no change
96
Best Practices
no change
40
SEO
no change

Lab metrics Lighthouse, mobile

Metric Current Previous Change Best Worst Trend
LCP Largest Contentful Paint 2.51 s — — 2.51 s 2.51 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 4.75 s — — 4.75 s 4.75 s
FCP First Contentful Paint 1.81 s — — 1.81 s 1.81 s
Speed Index 3.47 s — — 3.47 s 3.47 s
TTFB Time to First Byte 455 ms — — 455 ms 455 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 1.18 s
time to first byte 245 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 652.4 kB — — 652.4 kB 652.4 kB
Requests 20 — — 20 20
Third-party Weight 150.4 kB — — 150.4 kB 150.4 kB
Third-party CPU 1.25 s — — 1.25 s 1.25 s
Unused JS 20.8 kB — — 20.8 kB 20.8 kB
Unused CSS 0 B — — 0 B 0 B

By resource type

other 419.8 kB · 7 req
document 107.7 kB · 2 req
script 106.8 kB · 2 req
image 13.1 kB · 2 req
third party 528.8 kB · 8 req

Third parties 2 entities

150.4 kB transferred, 1.25 s of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

substack.com 123.6 kB · 1.23 s CPU
cloudflare.com 26.8 kB · 18 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 5.95 s — — 5.95 s 5.95 s
Long Tasks 13 — — 13 13
DOM Elements 35 — — 35 35
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 1 — — 1 1

Main thread work

script evaluation 4.98 s
other 699 ms
style layout 103 ms
parse HTML 58 ms
paint composite render 58 ms
script parse compile 27 ms
garbage collection 21 ms

Axe violations axe-core 4.13.0, full rule set

1 violating node across 1 rule, 75 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 meta-refresh — Delayed refresh under 20 hours must not be used 1 node

Accessibility failures 1 of 20 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.

  • meta-refresh — The document uses `<meta http-equiv="refresh">` 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 3 console errors

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, 6:44 AM UTC 65 2.51 s 0 4.75 s 652.4 kB 1/3 — 2,057 30.6s

Embed this score

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