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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
3
PASS
11
INFO
2

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
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.
75
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.

933 ms

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

2.20 s

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

204 ms

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

0.218

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

1.39 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.

3.45 s

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
11 PASS 3 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
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
https://metal-archives.com/images/ozzy.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12 images 429 KB
0 oversized -0 KB
11 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

C
JS Execution Cost
Action
1371ms total JS execution
REVIEW
1371ms total JS execution
Warning::
https://metal-archives.com/cdn-cgi/challenge-platf...: 564ms CPU time
Warning::
https://metal-archives.com/: 313ms CPU time
Info::
Unattributable: 182ms CPU time
Info::
https://metal-archives.com/cdn-cgi/scripts/7d0fa10...: 136ms CPU time
Info::
https://metal-archives.com/min/index.php?g=js&v=12...: 126ms CPU time
Info::
Third-party scripts: 232ms (17% of total)

Main Thread Breakdown

Script Evaluation 59% Other 17% Style & Layout 14% Script Parsing & Compilation 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://metal-archives.com/cdn-cgi/challenge-platform/scripts/jsd/main.js564ms537ms10ms1st
https://metal-archives.com/313ms42ms2ms1st
Unattributable182ms7ms0ms3rd
https://metal-archives.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js136ms117ms4ms1st
https://metal-archives.com/min/index.php?g=js&v=127126ms72ms48ms1st
https://ssl.google-analytics.com/ga.js51ms44ms6ms3rd
B
JS Bundles
5 scripts, 75 KB unused
REVIEW
5 scripts, 75 KB unused
Warning::
https://metal-archives.com/min/index.php?g=js&v=12...: 75 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 75 KB
75 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://metal-archives.com/min/index.php?g=js&v=127107 KB75 KB (71%)✓1st
https://metal-archives.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4 KB—✓1st
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://metal-archives.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 KB—✓1st
https://ssl.google-analytics.com/ga.js17 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

A+
Page Weight Budget
607 KB transferred, 26 requests
PASS
607 KB transferred, 26 requests
Info::
Page weighs 1.0 MB (607 KB transferred)
Info::
26 HTTP requests
Info::
Estimated 0.12 g CO2 per page load
607 KB / 2.4 MB budget
607 KB transferred
26 requests
0.12 g CO2 per page load
Images 429.0 KiB 71%
JavaScript 151.1 KiB 25%
HTML 11.9 KiB 2%
CSS 11.9 KiB 2%
Other 1.7 KiB 0%
Other 1.3 KiB 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
5% third-party, 0 ms blocking
PASS
5% third-party, 0 ms blocking
Info::
Third-party code accounts for 5% of page weight (29.4 KiB of 606.8 KiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-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+
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+
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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 resource hints configured

A+
Page Weight Inventory
26 resources · 607 KB · 75 KB savings available
PASS
26 resources · 607 KB · 75 KB savings available
Info::
Within 1MB page-weight target
Got: 607 KB
Info::
~75 KB of savings available
Info::
6 third-party resources (5% of weight)
Info::
1 resources over 200KB
26 resources · 606.8 KiB · 6 third-party Within 1MB page-weight target
Image 71% · 430.0 KiB
JavaScript 25% · 151.1 KiB
Document 2% · 11.9 KiB
CSS 2% · 11.9 KiB
Other 0% · 1.9 KiB

~75.0 KiB of savings available

Remove unused JavaScript: 75.0 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
26 requests over 558ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 933 ms LCP 2.2 shttps://metal-archives.com// https://metal-archives.com/ — 200 — 11.9 KiB — 181 ms — h3https://metal-archives.com/min/index.php?g=css&v=125/min/index.php?g=css&v=125 https://metal-archives.com/min/index.php?g=css&v=125 — 200 — 11.9 KiB — 41 ms — h3https://www.metal-archives.com/images/loading.gifwww.metal-archives.com/images/loadi... https://www.metal-archives.com/images/loading.gif — 200 — 864 B — 20 ms — h3https://metal-archives.com/images/ozzy.webp/images/ozzy.webp https://metal-archives.com/images/ozzy.webp — 200 — 345.7 KiB — 30 ms — h3https://metal-archives.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js/cdn-cgi/scripts/7d0fa10a/cloudflar... https://metal-archives.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js — 200 — 4.4 KiB — 6 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 25 ms — h2https://metal-archives.com/css/default/images/smallerlogo.jpg/css/default/images/smallerlogo.jpg https://metal-archives.com/css/default/images/smallerlogo.jpg — 200 — 21.9 KiB — 11 ms — h3https://metal-archives.com/css/default/images/ui-btn_submit.png/css/default/images/ui-btn_submit.p... https://metal-archives.com/css/default/images/ui-btn_submit.png — 200 — 1.6 KiB — 21 ms — h3https://metal-archives.com/css/default/images/ui-ornements_c2b8af_50.png/css/default/images/ui-ornements_c2... https://metal-archives.com/css/default/images/ui-ornements_c2b8af_50.png — 200 — 1.1 KiB — 22 ms — h3https://metal-archives.com/css/default/images/ui-bg_grain.png/css/default/images/ui-bg_grain.png https://metal-archives.com/css/default/images/ui-bg_grain.png — 200 — 23.0 KiB — 16 ms — h3https://metal-archives.com/css/default/images/ui-btn_login.png/css/default/images/ui-btn_login.pn... https://metal-archives.com/css/default/images/ui-btn_login.png — 200 — 986 B — 20 ms — h3https://metal-archives.com/css/default/images/ui-bg_webs.png/css/default/images/ui-bg_webs.png https://metal-archives.com/css/default/images/ui-bg_webs.png — 200 — 7.6 KiB — 19 ms — h3https://metal-archives.com/css/default/images/ui-ornements_c2b8af_30.png/css/default/images/ui-ornements_c2... https://metal-archives.com/css/default/images/ui-ornements_c2b8af_30.png — 200 — 1.2 KiB — 12 ms — h3https://metal-archives.com/css/default/images/ui-bg_waves.png/css/default/images/ui-bg_waves.png https://metal-archives.com/css/default/images/ui-bg_waves.png — 200 — 20.2 KiB — 18 ms — h3https://metal-archives.com/css/default/images/ui-icons_6d4c4c_256x240.png/css/default/images/ui-icons_6d4c4c... https://metal-archives.com/css/default/images/ui-icons_6d4c4c_256x240.png — 200 — 4.6 KiB — 18 ms — h3https://metal-archives.com/min/index.php?g=js&v=127/min/index.php?g=js&v=127 https://metal-archives.com/min/index.php?g=js&v=127 — 200 — 106.5 KiB — 66 ms — h3https://metal-archives.com/cdn-cgi/challenge-platform/scripts/jsd/main.js/cdn-cgi/challenge-platform/scripts... https://metal-archives.com/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 223 B — 6 ms — h3https://metal-archives.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?/cdn-cgi/challenge-platform/h/b/scr... https://metal-archives.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 12.0 KiB — 7 ms — h3https://metal-archives.com/favicon.ico/favicon.ico https://metal-archives.com/favicon.ico — 200 — 1.1 KiB — 12 ms — h3https://metal-archives.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.7043180580881672:1776895634:KUWS1dNsHy93mcR9H64H8gEr55l4ZSQoZ7ewim4GQxc/9f08168d0cc24376/cdn-cgi/challenge-platform/h/b/jsd... https://metal-archives.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.7043180580881672:1776895634:KUWS1dNsHy93mcR9H64H8gEr55l4ZSQoZ7ewim4GQxc/9f08168d0cc24376 — 200 — 634 B — 12 ms — h3https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 18 ms — h2https://www.metal-archives.com/user/sessionwww.metal-archives.com/user/session https://www.metal-archives.com/user/session — -1 — 0 B — 102 ms — https://www.metal-archives.com/index/ajax-statswww.metal-archives.com/index/ajax-s... https://www.metal-archives.com/index/ajax-stats — -1 — 0 B — 99 ms — https://metal-archives.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.7043180580881672:1776895634:KUWS1dNsHy93mcR9H64H8gEr55l4ZSQoZ7ewim4GQxc/9f08168d0cc24376/cdn-cgi/challenge-platform/h/b/jsd... https://metal-archives.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.7043180580881672:1776895634:KUWS1dNsHy93mcR9H64H8gEr55l4ZSQoZ7ewim4GQxc/9f08168d0cc24376 — 200 — 633 B — 12 ms — h3https://metal-archives.com/cdn-cgi/rum?/cdn-cgi/rum? https://metal-archives.com/cdn-cgi/rum? — 204 — 467 B — 9 ms — h3https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=1533376029&utmhn=metal-archives.com&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=Home%20-%20Encyclopaedia%20Metallum%3A%20The%20Metal%20Archives&utmhid=2119529314&utmr=-&utmp=%2F&utmht=1776897185324&utmac=UA-4046749-4&utmcc=__utma%3D235797405.1577015992.1776897185.1776897185.1776897185.1%3B%2B__utmz%3D235797405.1776897185.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=662985721&utmredir=1&utmu=qAAAAAAAAAAAAAAAAAAAAAAE~ssl.google-analytics.com/r/__utm.gi... https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=1533376029&utmhn=metal-archives.com&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=Home%20-%20Encyclopaedia%20Metallum%3A%20The%20Metal%20Archives&utmhid=2119529314&utmr=-&utmp=%2F&utmht=1776897185324&utmac=UA-4046749-4&utmcc=__utma%3D235797405.1577015992.1776897185.1776897185.1776897185.1%3B%2B__utmz%3D235797405.1776897185.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=662985721&utmredir=1&utmu=qAAAAAAAAAAAAAAAAAAAAAAE~ — 200 — 440 B — 19 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
17% of JavaScript execution is third-party
First-party Third-party 232ms · 17KB · $3/mo
Unattributable
Other
Optional
Execution 182ms
Transfer 0 KB
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 51ms
Transfer 17 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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