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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
98
GRADE
A+
FIX
1
REVIEW
1
PASS
11
INFO
1

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

Mobile Desktop
100
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.
81
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.

241 ms

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

361 ms

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

0 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.

477 ms

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

361 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
14
11 PASS 1 REVIEW 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.

B
Image Optimization
3 images, 0 KB saveable
REVIEW
3 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.
3 images 44 KB
0 oversized -0 KB
3 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+
Page Weight Budget
64 KB transferred, 9 requests
PASS
64 KB transferred, 9 requests
Info::
Page weighs 85 KB (64 KB transferred)
Info::
9 HTTP requests
Info::
Estimated 0.01 g CO2 per page load
64 KB / 2.4 MB budget
64 KB transferred
9 requests
0.01 g CO2 per page load
Images 43.6 KiB 68%
JavaScript 11.7 KiB 18%
CSS 3.5 KiB 5%
HTML 2.8 KiB 4%
Other 1.3 KiB 2%
Other 1.0 KiB 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+
JS Execution Cost
51ms total JS execution
PASS
51ms total JS execution
Info::
https://mail-archive.com/cdn-cgi/challenge-platfor...: 51ms CPU time

Main Thread Breakdown

Script Evaluation 58% Other 27% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://mail-archive.com/cdn-cgi/challenge-platform/scripts/jsd/main.js51ms48ms1ms1st
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?12 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
9 resources · 64 KB · 0 KB savings available
PASS
9 resources · 64 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 64 KB
9 resources · 63.8 KiB · 0 third-party Within 1MB page-weight target
Image 70% · 44.7 KiB
JavaScript 18% · 11.7 KiB
CSS 5% · 3.5 KiB
Document 4% · 2.8 KiB
Other 2% · 1.2 KiB
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
9 requests over 668ms
INFO
0 ms 200 ms 400 ms 600 ms FCP 241 ms LCP 361 mshttps://mail-archive.com// https://mail-archive.com/ — 200 — 2.8 KiB — 489 ms — h3https://mail-archive.com/assets/css/styles.css/assets/css/styles.css https://mail-archive.com/assets/css/styles.css — 200 — 3.5 KiB — 27 ms — h3https://mail-archive.com/assets/img/logo.png/assets/img/logo.png https://mail-archive.com/assets/img/logo.png — 200 — 16.4 KiB — 25 ms — h3https://mail-archive.com/assets/img/decorative-image.png/assets/img/decorative-image.png https://mail-archive.com/assets/img/decorative-image.png — 200 — 25.2 KiB — 28 ms — h3https://mail-archive.com/assets/img/search.png/assets/img/search.png https://mail-archive.com/assets/img/search.png — 200 — 2.0 KiB — 26 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 — 21 ms — h3https://mail-archive.com/favicon.ico/favicon.ico https://mail-archive.com/favicon.ico — 200 — 1.1 KiB — 25 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 — 11.7 KiB — 23 ms — h3https://mail-archive.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.26267945896456757:1776888748:d8ZJUSqLLzxkOsprZnYwJCPyd_cwcfeIlxdsgOjd-T0/9f076bc73b0d9f03/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-T0/9f076bc73b0d9f03 — 200 — 1.0 KiB — 26 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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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