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 ·

rkblog.dev

https://rkblog.dev/

99 100 100 100 ✓CWV 0AXE

Data from Aug 21, 2026, 5:40 AM UTC — 13h old.

Built Awesome · 1 measurement · since Aug 21, 2026 · last attempt 13h

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
Cloudflare Hosted by Cloudflare

Core Web Vitals field data, origin-level

Real Chrome users, 28-day window (2026-07-23 → 2026-08-19). This is what Google measures you on.

LCP 916 ms good
INP — no data
CLS 0 good

Scores

99
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 1.61 s — — 1.61 s 1.61 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 55 ms — — 55 ms 55 ms
FCP First Contentful Paint 1.53 s — — 1.53 s 1.53 s
Speed Index 1.53 s — — 1.53 s 1.53 s
TTFB Time to First Byte 614 ms — — 614 ms 614 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 56 ms
time to first byte 12 ms

Field data Chrome UX Report, origin-level

Real Chrome users, 28-day trailing window (2026-07-23 → 2026-08-19). This is what Google measures you on.

Metric p75 Rating Distribution (good / needs work / poor)
LCP CWV 916 ms good 98.8% good
CLS CWV 0 good 95.9% good
FCP 879 ms good 93.8% good
TTFB 572 ms good 88% good

Lab vs field

Lab LCP 1.61 s · field p75 916 ms · real users are 0.57× faster than the lab.

Field history 25 weeks

Weekly p75 from the CrUX History API, backfilled in a single request.

Week ending LCPINPCLSFCPTTFB
2026-08-15 918 ms — 0 914 ms 535 ms
2026-08-08 936 ms — 0 933 ms 527 ms
2026-08-01 877 ms — 0 874 ms 515 ms
2026-07-25 933 ms — 0 904 ms 517 ms
2026-07-18 937 ms — 0 873 ms 536 ms
2026-07-11 1.02 s — 0 1.01 s 668 ms
2026-07-04 1.00 s — 0 946 ms 649 ms
2026-06-27 1.01 s — 0 946 ms 649 ms
2026-06-20 999 ms — 0 906 ms 620 ms
2026-06-13 753 ms — 0 719 ms 471 ms
2026-06-06 930 ms — 0 830 ms 471 ms
2026-05-30 1.00 s — 0 934 ms 567 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 187.2 kB — — 187.2 kB 187.2 kB
Requests 8 — — 8 8
Third-party Weight 181.1 kB — — 181.1 kB 181.1 kB
Third-party CPU 57 ms — — 57 ms 57 ms
Unused JS 73.8 kB — — 73.8 kB 73.8 kB
Unused CSS 0 B — — 0 B 0 B

By resource type

script 181.1 kB · 2 req
document 3.5 kB · 1 req
image 783 B · 1 req
other 444 B · 1 req
third party 181.1 kB · 2 req

Third parties 2 entities

181.1 kB transferred, 57 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

Google Tag Manager 169.6 kB · 53 ms CPU
Cloudflare 11.5 kB · 4 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 409 ms — — 409 ms 409 ms
Long Tasks 2 — — 2 2
DOM Elements 115 — — 115 115
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

script evaluation 218 ms
other 110 ms
script parse compile 45 ms
style layout 23 ms
parse HTML 7 ms
paint composite render 7 ms

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 263 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 21, 2026, 5:40 AM UTC 99 1.61 s 0 55 ms 187.2 kB 3/3 ±1 2,353 21.3s

Embed this score

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