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https://sitemaps.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
97
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
70
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.98 s

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

1.98 s

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

109 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.

1.98 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.

4.91 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
10 PASS 3 REVIEW 2 FIX
D
Third-Party Impact
Action
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (193.4 KiB of 200.0 KiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
D
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.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

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

B
JS Execution Cost
524ms total JS execution
REVIEW
524ms total JS execution
Info::
https://www.googletagmanager.com/gtag/js?id=G-S3EJ...: 160ms CPU time
Info::
Unattributable: 141ms CPU time
Info::
https://az416426.vo.msecnd.net/scripts/a/ai.0.js: 90ms CPU time
Info::
https://sitemaps.org/: 70ms CPU time
Info::
https://www.google-analytics.com/analytics.js: 64ms CPU time
Warning::
Third-party scripts: 455ms (87% of total)

Main Thread Breakdown

Script Evaluation 60% Other 21% Script Parsing & Compilation 9% Style & Layout 9%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-S3EJK0BRXD&cx=c&_slc=1160ms127ms32ms3rd
Unattributable141ms56ms0ms3rd
https://az416426.vo.msecnd.net/scripts/a/ai.0.js90ms69ms11ms3rd
https://sitemaps.org/70ms9ms1ms1st
https://www.google-analytics.com/analytics.js64ms59ms5ms3rd
B
JS Bundles
5 scripts, 64 KB unused
REVIEW
5 scripts, 64 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S3EJ...: 64 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 64 KB
64 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-S3EJK0BRXD&cx=c&_slc=1148 KB64 KB (43%)✓3rd
https://sitemaps.org/lang.js2 KB—✓1st
https://az416426.vo.msecnd.net/scripts/a/ai.0.js22 KB—✓3rd
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://www.bing.com/widget/metrics.js2 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
200 KB transferred, 13 requests
PASS
200 KB transferred, 13 requests
Info::
Page weighs 575 KB (200 KB transferred)
Info::
13 HTTP requests
Info::
Estimated 0.04 g CO2 per page load
200 KB / 2.4 MB budget
200 KB transferred
13 requests
0.04 g CO2 per page load
JavaScript 193.5 KiB 97%
HTML 2.7 KiB 1%
CSS 1.7 KiB 1%
Other 854 B 0%
Other 662 B 0%
Other 546 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
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
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
13 resources · 200 KB · 64 KB savings available
PASS
13 resources · 200 KB · 64 KB savings available
Info::
Within 1MB page-weight target
Got: 200 KB
Info::
~64 KB of savings available
Warning::
9 third-party resources (97% of weight)
13 resources · 200.0 KiB · 9 third-party Within 1MB page-weight target
JavaScript 97% · 193.5 KiB
Document 1% · 3.0 KiB
Other 1% · 1.8 KiB
CSS 1% · 1.7 KiB

~63.5 KiB of savings available

Remove unused JavaScript: 63.5 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
Network Waterfall
13 requests over 1295ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 2.0 s LCP 2.0 shttps://sitemaps.org// https://sitemaps.org/ — 200 — 2.7 KiB — 532 ms — http/1.1https://sitemaps.org/sitemaps.css/sitemaps.css https://sitemaps.org/sitemaps.css — 200 — 1.7 KiB — 132 ms — http/1.1https://sitemaps.org/lang.js/lang.js https://sitemaps.org/lang.js — 200 — 1.9 KiB — 136 ms — http/1.1https://az416426.vo.msecnd.net/scripts/a/ai.0.jsaz416426.vo.msecnd.net/scripts/a/ai... https://az416426.vo.msecnd.net/scripts/a/ai.0.js — 200 — 21.6 KiB — 160 ms — h2https://ssl.bing.com/widget/metrics.jsssl.bing.com/widget/metrics.js https://ssl.bing.com/widget/metrics.js — 302 — 591 B — 135 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 98 ms — h2https://sitemaps.org/favicon.ico/favicon.ico https://sitemaps.org/favicon.ico — 404 — 263 B — 133 ms — http/1.1https://dc.services.visualstudio.com/v2/trackdc.services.visualstudio.com/v2/tra... https://dc.services.visualstudio.com/v2/track — 204 — 0 B — 210 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=853078280&t=pageview&_s=1&dl=https%3A%2F%2Fsitemaps.org%2F&ul=en-us&dt=sitemaps.org%20-%20Home&sr=412x823&vp=980x1957&_u=IEBAAAABAAAAACAAI~&jid=1459880396&gjid=1754350742&cid=1597447859.1776802810&tid=UA-40262775-1&_gid=245409677.1776802810&_r=1&_slc=1&z=104344571www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=853078280&t=pageview&_s=1&dl=https%3A%2F%2Fsitemaps.org%2F&ul=en-us&dt=sitemaps.org%20-%20Home&sr=412x823&vp=980x1957&_u=IEBAAAABAAAAACAAI~&jid=1459880396&gjid=1754350742&cid=1597447859.1776802810&tid=UA-40262775-1&_gid=245409677.1776802810&_r=1&_slc=1&z=104344571 — 200 — 462 B — 25 ms — h2https://www.bing.com/widget/metrics.jswww.bing.com/widget/metrics.js https://www.bing.com/widget/metrics.js — 404 — 1.5 KiB — 137 ms — h2https://www.googletagmanager.com/gtag/js?id=G-S3EJK0BRXD&cx=c&_slc=1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-S3EJK0BRXD&cx=c&_slc=1 — 200 — 147.5 KiB — 141 ms — h2https://dc.services.visualstudio.com/v2/trackdc.services.visualstudio.com/v2/tra... https://dc.services.visualstudio.com/v2/track — 200 — 200 B — 113 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-S3EJK0BRXD&gtm=45je64h1v9124387949za20g&_p=1776802809763&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=ABAI&are=1&cid=1597447859.1776802810&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938469~117266400&dl=https%3A%2F%2Fsitemaps.org%2F&dt=sitemaps.org%20-%20Home&sid=1776802809&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1205region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-S3EJK0BRXD&gtm=45je64h1v9124387949za20g&_p=1776802809763&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=ABAI&are=1&cid=1597447859.1776802810&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938469~117266400&dl=https%3A%2F%2Fsitemaps.org%2F&dt=sitemaps.org%20-%20Home&sid=1776802809&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1205 — 204 — 546 B — 89 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
87% of JavaScript execution is third-party
First-party Third-party 455ms · 190KB · $6/mo
Google Tag Manager
Tag Manager
Optional
Execution 160ms
Transfer 148 KB
Unused 43%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 141ms
Transfer 0 KB
Monthly Cost $2/mo
az416426.vo.msecnd.net
Other
Optional
Execution 90ms
Transfer 22 KB
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 64ms
Transfer 21 KB
Monthly Cost $1/mo

87% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

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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