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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
1
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.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

750 ms

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

1.15 s

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.

761 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.

1.15 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
15
10 PASS 1 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (463.5 KiB of 463.8 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
JS Bundles
3 scripts, 90 KB unused
REVIEW
3 scripts, 90 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JTRZ...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.xml-sitemaps.com/js/xapp-co-v177613712...: 24 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 90 KB
90 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-JTRZH7DBY8157 KB65 KB (42%)✓3rd
https://www.xml-sitemaps.com/js/xapp-co-v1776137121.js56 KB24 KB (44%)✓3rd
https://apis.google.com/js/platform.js24 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

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
464 KB transferred, 14 requests
PASS
464 KB transferred, 14 requests
Info::
Page weighs 1015 KB (464 KB transferred)
Info::
14 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
464 KB / 2.4 MB budget
464 KB transferred
14 requests
0.09 g CO2 per page load
JavaScript 237.4 KiB 51%
Fonts 174.0 KiB 38%
Images 28.6 KiB 6%
CSS 10.4 KiB 2%
HTML 7.4 KiB 2%
Other 5.1 KiB 1%
Other 553 B 0%
Other 417 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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 29 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
185ms total JS execution
PASS
185ms total JS execution
Info::
https://www.xml-sitemaps.com/js/xapp-co-v177613712...: 79ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-JTRZ...: 55ms CPU time
Info::
https://www.xml-sitemaps.com/: 51ms CPU time
Warning::
Third-party scripts: 185ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 26% Style & Layout 17% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.xml-sitemaps.com/js/xapp-co-v1776137121.js79ms44ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JTRZH7DBY855ms45ms10ms3rd
https://www.xml-sitemaps.com/51ms1ms2ms3rd
A+
Font Loading
2 fonts (174 KB)
PASS
2 fonts (174 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

174 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 750 ms LCP 1.1 shttps://www.xml-sitemaps.com/css/fonts/inter.woff2inter.woff2 https://www.xml-sitemaps.com/css/fonts/inter.woff2 — 48.0 KiB — 70 ms — font-display: swaphttps://www.xml-sitemaps.com/css/fonts/material-icons.woff2material-icons.woff2 https://www.xml-sitemaps.com/css/fonts/material-icons.woff2 — 126.0 KiB — 167 ms — font-display: swap
inter.woff2 woff2 swap
Size 48 KB
Load time 70 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
material-icons.woff2 woff2 swap
Size 126 KB
Load time 167 ms
Start 236 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~63 KB and ~126 ms

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
14 resources · 464 KB · 90 KB savings available
PASS
14 resources · 464 KB · 90 KB savings available
Info::
Within 1MB page-weight target
Got: 464 KB
Info::
~90 KB of savings available
Warning::
13 third-party resources (100% of weight)
14 resources · 463.8 KiB · 13 third-party Within 1MB page-weight target
JavaScript 51% · 237.4 KiB
Font 38% · 174.0 KiB
Image 7% · 33.4 KiB
CSS 2% · 10.4 KiB
Document 2% · 7.7 KiB
Other 0% · 970 B

~89.6 KiB of savings available

Remove unused JavaScript: 89.6 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: GURU Cloud Hosting

Network Waterfall
14 requests over 587ms
INFO
0 ms 500 ms 1.0 s FCP 750 ms LCP 1.1 shttps://xml-sitemaps.com// https://xml-sitemaps.com/ — 301 — 323 B — 100 ms — http/1.1https://www.xml-sitemaps.com/www.xml-sitemaps.com/ https://www.xml-sitemaps.com/ — 200 — 7.4 KiB — 127 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-JTRZH7DBY8www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-JTRZH7DBY8 — 200 — 157.3 KiB — 177 ms — h2https://www.xml-sitemaps.com/css/fonts/inter.woff2www.xml-sitemaps.com/css/fonts/inte... https://www.xml-sitemaps.com/css/fonts/inter.woff2 — 200 — 48.0 KiB — 70 ms — http/1.1https://www.xml-sitemaps.com/css/fonts/material-icons.woff2www.xml-sitemaps.com/css/fonts/mate... https://www.xml-sitemaps.com/css/fonts/material-icons.woff2 — 200 — 126.0 KiB — 167 ms — http/1.1https://www.xml-sitemaps.com/css/xapp-co-v1775894500.csswww.xml-sitemaps.com/css/xapp-co-v1... https://www.xml-sitemaps.com/css/xapp-co-v1775894500.css — 200 — 10.4 KiB — 88 ms — http/1.1https://www.xml-sitemaps.com/images/xml-sitemaps-text.pngwww.xml-sitemaps.com/images/xml-sit... https://www.xml-sitemaps.com/images/xml-sitemaps-text.png — 200 — 17.1 KiB — 111 ms — http/1.1https://www.xml-sitemaps.com/images/xml-sitemaps-logo.pngwww.xml-sitemaps.com/images/xml-sit... https://www.xml-sitemaps.com/images/xml-sitemaps-logo.png — 200 — 6.3 KiB — 101 ms — http/1.1https://www.xml-sitemaps.com/images/pro-sitemaps-hlogo.pngwww.xml-sitemaps.com/images/pro-sit... https://www.xml-sitemaps.com/images/pro-sitemaps-hlogo.png — 200 — 5.3 KiB — 113 ms — http/1.1https://apis.google.com/js/platform.jsapis.google.com/js/platform.js https://apis.google.com/js/platform.js — 200 — 24.3 KiB — 113 ms — h2https://www.xml-sitemaps.com/js/xapp-co-v1776137121.jswww.xml-sitemaps.com/js/xapp-co-v17... https://www.xml-sitemaps.com/js/xapp-co-v1776137121.js — 200 — 55.8 KiB — 78 ms — http/1.1https://www.xml-sitemaps.com/index.php?op=info&itype=countrywww.xml-sitemaps.com/index.php?op=i... https://www.xml-sitemaps.com/index.php?op=info&itype=country — 200 — 417 B — 55 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-JTRZH7DBY8&gtm=45je64k1v9171212828za200zd9171212828&_p=1776896918152&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=457012376.1776896918&frm=0&pscdl=noapi&rcb=16&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117512542&sid=1776896918&sct=1&seg=0&dl=https%3A%2F%2Fwww.xml-sitemaps.com%2F&dt=Create%20your%20Google%20Sitemap%20Online%20-%20XML%20Sitemaps%20Generator&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=494region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-JTRZH7DBY8&gtm=45je64k1v9171212828za200zd9171212828&_p=1776896918152&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=457012376.1776896918&frm=0&pscdl=noapi&rcb=16&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117512542&sid=1776896918&sct=1&seg=0&dl=https%3A%2F%2Fwww.xml-sitemaps.com%2F&dt=Create%20your%20Google%20Sitemap%20Online%20-%20XML%20Sitemaps%20Generator&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=494 — 204 — 553 B — 92 ms — h2https://www.xml-sitemaps.com/images/logo-trans.pngwww.xml-sitemaps.com/images/logo-tr... https://www.xml-sitemaps.com/images/logo-trans.png — 200 — 4.8 KiB — 30 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 185ms · 220KB · £2/mo
www.xml-sitemaps.com
Other
Optional
Execution 79ms
Transfer 56 KB
Unused 44%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 55ms
Transfer 157 KB
Unused 42%
Monthly Cost £1/mo
www.xml-sitemaps.com
Other
Optional
Execution 51ms
Transfer 7 KB
Monthly Cost £1/mo

100% 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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