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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
98
GRADE
A+
FIX
1
REVIEW
0
PASS
14
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
99
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

806 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

926 ms

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

34 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.60 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

991 ms

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
14 PASS 1 FIX
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

A+
Page Weight Budget
40 KB transferred, 8 requests
PASS
40 KB transferred, 8 requests
Info::
Page weighs 65 KB (40 KB transferred)
Info::
8 HTTP requests
Info::
Estimated 0.01 g CO2 per page load
40 KB / 2.4 MB budget
40 KB transferred
8 requests
0.01 g CO2 per page load
Images 18.2 KiB 46%
JavaScript 13.4 KiB 34%
CSS 3.3 KiB 8%
HTML 2.8 KiB 7%
Other 1.3 KiB 3%
Other 819 B 2%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Warning::
https://mail-archive.com/assets/img/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 18 KB
0 oversized -0 KB
2 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

A+
JS Execution Cost
462ms total JS execution
PASS
462ms total JS execution
Info::
https://mail-archive.com/cdn-cgi/challenge-platfor...: 247ms CPU time
Info::
https://mail-archive.com/: 113ms CPU time
Info::
Unattributable: 102ms CPU time
Info::
Third-party scripts: 102ms (22% of total)

Main Thread Breakdown

Script Evaluation 60% Other 26% Style & Layout 9%
ScriptTotalScriptingParse/CompileParty
https://mail-archive.com/cdn-cgi/challenge-platform/scripts/jsd/main.js247ms236ms3ms1st
https://mail-archive.com/113ms37ms3ms1st
Unattributable102ms6ms0ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
1 scripts, 0 KB unused
PASS
1 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://mail-archive.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?13 KB—✓1st
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Page Weight Inventory
8 resources · 40 KB · 0 KB savings available
PASS
8 resources · 40 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 40 KB
8 resources · 39.9 KiB · 0 third-party Within 1MB page-weight target
Image 48% · 19.3 KiB
JavaScript 34% · 13.4 KiB
CSS 8% · 3.3 KiB
Document 7% · 2.8 KiB
Other 3% · 1.0 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
8 requests over 2442ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 806 ms LCP 926 mshttps://mail-archive.com// https://mail-archive.com/ — 200 — 2.8 KiB — 2.2 s — h2https://mail-archive.com/assets/css/styles.css/assets/css/styles.css https://mail-archive.com/assets/css/styles.css — 200 — 3.3 KiB — 27 ms — h2https://mail-archive.com/assets/img/logo.png/assets/img/logo.png https://mail-archive.com/assets/img/logo.png — 200 — 16.2 KiB — 28 ms — h2https://mail-archive.com/assets/img/search.png/assets/img/search.png https://mail-archive.com/assets/img/search.png — 200 — 2.0 KiB — 32 ms — h3https://mail-archive.com/cdn-cgi/challenge-platform/scripts/jsd/main.js/cdn-cgi/challenge-platform/scripts... https://mail-archive.com/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 223 B — 20 ms — h3https://mail-archive.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?/cdn-cgi/challenge-platform/h/b/scr... https://mail-archive.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 13.4 KiB — 41 ms — h3https://mail-archive.com/favicon.ico/favicon.ico https://mail-archive.com/favicon.ico — 200 — 1.1 KiB — 27 ms — h3https://mail-archive.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.26267945896456757:1776888748:d8ZJUSqLLzxkOsprZnYwJCPyd_cwcfeIlxdsgOjd-T0/9f076b72adc00379/cdn-cgi/challenge-platform/h/b/jsd... https://mail-archive.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.26267945896456757:1776888748:d8ZJUSqLLzxkOsprZnYwJCPyd_cwcfeIlxdsgOjd-T0/9f076b72adc00379 — 200 — 819 B — 28 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
22% of JavaScript execution is third-party
First-party Third-party 102ms · 0KB · $1/mo
Unattributable
Other
Optional
Execution 102ms
Transfer 0 KB
Monthly Cost $1/mo

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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