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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
3
PASS
7
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.
76
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.

895 ms

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

1.00 s

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

3 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.

895 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.

1.82 s

Page Load Progression

420 ms
841 ms
1.3 s
1.7 s
2.1 s
2.5 s
2.9 s
3.4 s
Checks
15
7 PASS 3 REVIEW 3 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 39 requests
FIX
2.2 MB transferred, 39 requests
Info::
Page weighs 2.7 MB (2.2 MB transferred)
Warning::
Images are 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Info::
39 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
39 requests
0.46 g CO2 per page load
Images 1.7 MiB 76%
JavaScript 420.9 KiB 19%
CSS 100.9 KiB 4%
Fonts 19.6 KiB 1%
HTML 10.0 KiB 0%
Other 1.8 KiB 0%
Other 542 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

D
JS Bundles
Action
8 scripts, 191 KB unused
FIX
8 scripts, 191 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-98TY...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W8F...: 64 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cn.com/assets/js/lib/jquery-3.5.1.min.js: 60 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cn.com/assets/js/main.js?v=1.0.1: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 191 KB
191 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-98TYREHL5J&cx=c&gtm=4e64h1156 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W8FWGL8118 KB64 KB (54%)✓3rd
https://cn.com/assets/js/lib/jquery-3.5.1.min.js88 KB60 KB (68%)✓1st
https://cn.com/assets/js/lib/modernizr.min.js?v=1.013 KB—✓1st
https://cn.com/assets/js/main.js?v=1.0.15 KB—✗1st
https://cn.com/assets/js/lib/underscore.min.js?v=1.0.116 KB—✓1st
https://cn.com/assets/js/search.js?v=1.1.016 KB—✗1st
https://cn.com/assets/js/home.js?v=1.0.110 KB—✗1st

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

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

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.

C
Image Optimization
Action
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://cn.com/assets/img/logos/cncom-white-single... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/logos/cncom-primary.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/icons/icon-cncom-global-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/icons/icon-cncom-no-cont... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/icons/icon-cncom-no-rest... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/icons/icon-cncom-seamles... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/domain-comparison-table-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/logos/cncom-dark-red.svg... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/icons/icon-cncom-unparal... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/icons/icon-cncom-seo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/icons/cncom-mag-glass-lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cn.com/assets/img/logos/cncom-special.svg?... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 1.7 MB
0 oversized -0 KB
24 legacy format
12 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

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

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

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

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

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

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

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

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

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

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

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
Page Weight Inventory
Action
39 resources · 2.2 MB · 191 KB savings available
REVIEW
39 resources · 2.2 MB · 191 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~191 KB of savings available
Info::
3 third-party resources (12% of weight)
Info::
4 resources over 200KB
39 resources · 2.2 MiB · 3 third-party 1.2 MiB over 1MB target
Image 76% · 1.7 MiB
JavaScript 19% · 420.9 KiB
CSS 4% · 100.9 KiB
Font 1% · 19.6 KiB
Document 0% · 10.0 KiB
Other 0% · 542 B

~190.7 KiB of savings available

Remove unused JavaScript: 190.7 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
12% third-party, 0 ms blocking
PASS
12% third-party, 0 ms blocking
Info::
Third-party code accounts for 12% of page weight (273.8 KiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
88%
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+
JS Execution Cost
359ms total JS execution
PASS
359ms total JS execution
Info::
Unattributable: 131ms CPU time
Info::
https://cn.com/: 103ms CPU time
Info::
https://cn.com/assets/js/home.js?v=1.0.1: 62ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-98TY...: 62ms CPU time
Warning::
Third-party scripts: 193ms (54% of total)

Main Thread Breakdown

Other 36% Script Evaluation 32% Style & Layout 18% Script Parsing & Compilation 7% Rendering 5%
ScriptTotalScriptingParse/CompileParty
Unattributable131ms26ms0ms3rd
https://cn.com/103ms2ms0ms1st
https://cn.com/assets/js/home.js?v=1.0.162ms16ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-98TYREHL5J&cx=c&gtm=4e64h162ms43ms14ms3rd
A+
Font Loading
2 fonts (20 KB)
PASS
2 fonts (20 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

20 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 895 ms LCP 1.0 shttps://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2albert-sans-v1-latin-re... https://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 9.7 KiB — 86 ms — font-display: swaphttps://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2albert-sans-v1-latin-90... https://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 9.8 KiB — 86 ms — font-display: swap
albert-sans-v1-latin-re... woff2 swap
Size 10 KB
Load time 86 ms
Start 531 ms
Risk FOUT — text flashes from fallback to web font
albert-sans-v1-latin-90... woff2 swap
Size 10 KB
Load time 86 ms
Start 532 ms
Risk FOUT — text flashes from fallback to web font
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)
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
Network Waterfall
39 requests over 1044ms
INFO
0 ms 500 ms 1.0 s FCP 895 ms LCP 1.0 shttps://cn.com// https://cn.com/ — 200 — 10.0 KiB — 203 ms — http/1.1https://cn.com/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://cn.com/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 127 ms — http/1.1https://cn.com/assets/css/style.css?v=1.1.3/assets/css/style.css?v=1.1.3 https://cn.com/assets/css/style.css?v=1.1.3 — 200 — 50.5 KiB — 190 ms — http/1.1https://cn.com/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://cn.com/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 246 ms — http/1.1https://cn.com/assets/img/logos/cncom-dark-red.svg?v=4/assets/img/logos/cncom-dark-red.sv... https://cn.com/assets/img/logos/cncom-dark-red.svg?v=4 — 200 — 11.9 KiB — 186 ms — http/1.1https://cn.com/assets/img/logos/cncom-special.svg?v=4/assets/img/logos/cncom-special.svg... https://cn.com/assets/img/logos/cncom-special.svg?v=4 — 200 — 18.9 KiB — 193 ms — http/1.1https://cn.com/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://cn.com/assets/img/icons/loader.svg — 200 — 3.0 KiB — 63 ms — http/1.1https://cn.com/assets/img/icons/icon-cncom-unparalleled.png/assets/img/icons/icon-cncom-unpara... https://cn.com/assets/img/icons/icon-cncom-unparalleled.png — 200 — 14.4 KiB — 65 ms — http/1.1https://cn.com/assets/img/icons/icon-cncom-global-recog.svg/assets/img/icons/icon-cncom-global... https://cn.com/assets/img/icons/icon-cncom-global-recog.svg — 200 — 7.3 KiB — 68 ms — http/1.1https://cn.com/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://cn.com/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 186 ms — http/1.1https://cn.com/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://cn.com/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 66 ms — http/1.1https://cn.com/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://cn.com/assets/js/lib/underscore.min.js?v=1.0.1 — 200 — 16.3 KiB — 72 ms — http/1.1https://cn.com/assets/js/search.js?v=1.1.0/assets/js/search.js?v=1.1.0 https://cn.com/assets/js/search.js?v=1.1.0 — 200 — 16.1 KiB — 135 ms — http/1.1https://cn.com/assets/js/home.js?v=1.0.1/assets/js/home.js?v=1.0.1 https://cn.com/assets/js/home.js?v=1.0.1 — 200 — 9.8 KiB — 189 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-W8FWGL8www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-W8FWGL8 — 200 — 117.7 KiB — 69 ms — h2https://cn.com/assets/img/icons/baseline-open_in_new-24px.svg/assets/img/icons/baseline-open_in_... https://cn.com/assets/img/icons/baseline-open_in_new-24px.svg — 200 — 795 B — 99 ms — http/1.1https://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2/assets/fonts/albert-sans/albert-sa... https://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 200 — 9.7 KiB — 86 ms — http/1.1https://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2/assets/fonts/albert-sans/albert-sa... https://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 200 — 9.8 KiB — 86 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-98TYREHL5J&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-98TYREHL5J&cx=c&gtm=4e64h1 — 200 — 155.6 KiB — 60 ms — h2https://cn.com/assets/img/icons/icon-cncom-seo.svg/assets/img/icons/icon-cncom-seo.sv... https://cn.com/assets/img/icons/icon-cncom-seo.svg — 200 — 6.0 KiB — 71 ms — http/1.1https://cn.com/assets/img/icons/icon-cncom-no-content.svg/assets/img/icons/icon-cncom-no-con... https://cn.com/assets/img/icons/icon-cncom-no-content.svg — 200 — 3.0 KiB — 65 ms — http/1.1https://cn.com/assets/img/icons/icon-cncom-no-restrictions.svg/assets/img/icons/icon-cncom-no-res... https://cn.com/assets/img/icons/icon-cncom-no-restrictions.svg — 200 — 4.5 KiB — 73 ms — http/1.1https://cn.com/assets/img/icons/icon-cncom-seamless-global.svg/assets/img/icons/icon-cncom-seamle... https://cn.com/assets/img/icons/icon-cncom-seamless-global.svg — 200 — 8.4 KiB — 67 ms — http/1.1https://cn.com/assets/img/oversized-icon.svg?v=4/assets/img/oversized-icon.svg?v=4 https://cn.com/assets/img/oversized-icon.svg?v=4 — 200 — 12.3 KiB — 66 ms — http/1.1https://cn.com/assets/img/domain-comparison-table-desktop.png?v=4/assets/img/domain-comparison-table... https://cn.com/assets/img/domain-comparison-table-desktop.png?v=4 — 200 — 279.5 KiB — 249 ms — http/1.1https://cn.com/assets/img/domain-comparison-table-mobile.png?v=4/assets/img/domain-comparison-table... https://cn.com/assets/img/domain-comparison-table-mobile.png?v=4 — 200 — 207.3 KiB — 193 ms — http/1.1https://cn.com/assets/img/icons/cncom-mag-glass-location.svg/assets/img/icons/cncom-mag-glass-l... https://cn.com/assets/img/icons/cncom-mag-glass-location.svg — 200 — 2.1 KiB — 69 ms — http/1.1https://cn.com/assets/img/sites/nordicnaturals_cn_com.jpg/assets/img/sites/nordicnaturals_cn... https://cn.com/assets/img/sites/nordicnaturals_cn_com.jpg — 200 — 142.7 KiB — 192 ms — http/1.1https://cn.com/assets/img/sites/huber_cn_com.jpg/assets/img/sites/huber_cn_com.jpg https://cn.com/assets/img/sites/huber_cn_com.jpg — 200 — 120.8 KiB — 132 ms — http/1.1https://cn.com/assets/img/sites/bataindustrials_cn_com.jpg/assets/img/sites/bataindustrials_c... https://cn.com/assets/img/sites/bataindustrials_cn_com.jpg — 200 — 245.4 KiB — 132 ms — http/1.1
0 ms 500 ms 1.0 s FCP 895 ms LCP 1.0 shttps://cn.com// https://cn.com/ — 200 — 10.0 KiB — 203 ms — http/1.1https://cn.com/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://cn.com/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 127 ms — http/1.1https://cn.com/assets/css/style.css?v=1.1.3/assets/css/style.css?v=1.1.3 https://cn.com/assets/css/style.css?v=1.1.3 — 200 — 50.5 KiB — 190 ms — http/1.1https://cn.com/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://cn.com/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 246 ms — http/1.1https://cn.com/assets/img/logos/cncom-dark-red.svg?v=4/assets/img/logos/cncom-dark-red.sv... https://cn.com/assets/img/logos/cncom-dark-red.svg?v=4 — 200 — 11.9 KiB — 186 ms — http/1.1https://cn.com/assets/img/logos/cncom-special.svg?v=4/assets/img/logos/cncom-special.svg... https://cn.com/assets/img/logos/cncom-special.svg?v=4 — 200 — 18.9 KiB — 193 ms — http/1.1https://cn.com/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://cn.com/assets/img/icons/loader.svg — 200 — 3.0 KiB — 63 ms — http/1.1https://cn.com/assets/img/icons/icon-cncom-unparalleled.png/assets/img/icons/icon-cncom-unpara... https://cn.com/assets/img/icons/icon-cncom-unparalleled.png — 200 — 14.4 KiB — 65 ms — http/1.1https://cn.com/assets/img/icons/icon-cncom-global-recog.svg/assets/img/icons/icon-cncom-global... https://cn.com/assets/img/icons/icon-cncom-global-recog.svg — 200 — 7.3 KiB — 68 ms — http/1.1https://cn.com/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://cn.com/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 186 ms — http/1.1https://cn.com/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://cn.com/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 66 ms — http/1.1https://cn.com/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://cn.com/assets/js/lib/underscore.min.js?v=1.0.1 — 200 — 16.3 KiB — 72 ms — http/1.1https://cn.com/assets/js/search.js?v=1.1.0/assets/js/search.js?v=1.1.0 https://cn.com/assets/js/search.js?v=1.1.0 — 200 — 16.1 KiB — 135 ms — http/1.1https://cn.com/assets/js/home.js?v=1.0.1/assets/js/home.js?v=1.0.1 https://cn.com/assets/js/home.js?v=1.0.1 — 200 — 9.8 KiB — 189 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-W8FWGL8www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-W8FWGL8 — 200 — 117.7 KiB — 69 ms — h2https://cn.com/assets/img/icons/baseline-open_in_new-24px.svg/assets/img/icons/baseline-open_in_... https://cn.com/assets/img/icons/baseline-open_in_new-24px.svg — 200 — 795 B — 99 ms — http/1.1https://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2/assets/fonts/albert-sans/albert-sa... https://cn.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 200 — 9.7 KiB — 86 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
54% of JavaScript execution is third-party
First-party Third-party 193ms · 156KB · €2/mo
Unattributable
Other
Optional
Execution 131ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 62ms
Transfer 156 KB
Unused 43%
Monthly Cost €1/mo

54% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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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