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 ·

flag.is

https://flag.is/

100 100 100 100 –CWV –AXE

Data from Aug 20, 2026, 10:31 PM UTC — 20h old.

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

Scores

100
Performance
no change
100
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 836 ms — — 836 ms 836 ms
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 0 ms — — 0 ms 0 ms
FCP First Contentful Paint 836 ms — — 836 ms 836 ms
Speed Index 1.30 s — — 1.30 s 1.30 s
TTFB Time to First Byte 621 ms — — 621 ms 621 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.

time to first byte 621 ms
element render delay 49 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 87.5 kB — — 87.5 kB 87.5 kB
Requests 80 — — 80 80
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

image 76.4 kB · 78 req
document 10.5 kB · 1 req
other 585 B · 1 req

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 1.09 s — — 1.09 s 1.09 s
Long Tasks 1 — — 1 1
DOM Elements 359 — — 359 359
A11y Failures 0 — — 0 0
A11y Failing Nodes 0 — — 0 0

Main thread work

other 698 ms
paint composite render 169 ms
style layout 166 ms
parse HTML 31 ms
script evaluation 25 ms
script parse compile 2 ms

Axe violations axe-core , full rule set

The axe run failed: Navigation timeout of 120000 ms exceeded

Hygiene

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

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache http/1.1

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, 10:31 PM UTC 100 836 ms 0 0 ms 87.5 kB 2/3 ±0 2,703 306.6s

Embed this score

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