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 ·

esif.dev

https://esif.dev/

98 100 100 92 –CWV 0AXE

Data from Aug 20, 2026, 9:40 PM UTC — 21h old.

Built Awesome · 1 measurement · since Aug 20, 2026 · last attempt 21h

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 2.0.1 Built with Eleventy 2.0.1
Cloudflare Hosted by Cloudflare

Scores

98
Performance
no change
100
Accessibility
no change
100
Best Practices
no change
92
SEO
no change

Lab metrics Lighthouse, mobile

Metric Current Previous Change Best Worst Trend
LCP Largest Contentful Paint 2.05 s — — 2.05 s 2.05 s
CLS Cumulative Layout Shift 0.017 — — 0.017 0.017
TBT Total Blocking Time 0 ms — — 0 ms 0 ms
FCP First Contentful Paint 1.69 s — — 1.69 s 1.69 s
Speed Index 1.69 s — — 1.69 s 1.69 s
TTFB Time to First Byte 623 ms — — 623 ms 623 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 87 ms
resource load duration 26 ms
time to first byte 26 ms
resource load delay 12 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 451.0 kB — — 451.0 kB 451.0 kB
Requests 31 — — 31 31
Third-party Weight 56.7 kB — — 56.7 kB 56.7 kB
Third-party CPU 4 ms — — 4 ms 4 ms
Unused JS 0 B — — 0 B 0 B
Unused CSS 0 B — — 0 B 0 B

By resource type

image 392.0 kB · 21 req
script 21.0 kB · 4 req
font 15.4 kB · 2 req
document 10.4 kB · 1 req
other 10.0 kB · 2 req
stylesheet 2.2 kB · 1 req
third party 56.7 kB · 11 req

Third parties 3 entities

56.7 kB transferred, 4 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

11ty.dev 29.9 kB · 0 ms CPU
Google Fonts 15.4 kB · 0 ms CPU
Cloudflare 11.5 kB · 4 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 470 ms — — 470 ms 470 ms
Long Tasks 0 — — 0 0
DOM Elements 868 — — 868 868
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset 0 — — 0 0
A11y Failures 0 — — 0 0
A11y Failing Nodes 0 — — 0 0

Main thread work

other 192 ms
script evaluation 116 ms
style layout 106 ms
paint composite render 32 ms
parse HTML 23 ms
script parse compile 2 ms

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 1448 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.

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, 9:40 PM UTC 98 2.05 s 0.017 0 ms 451.0 kB 3/3 ±1 2,503 29.6s

Embed this score

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