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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
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.

1.47 s

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

2.30 s

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

1 ms

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

0.001

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

2.85 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.

2.30 s

Page Load Progression

767 ms
1.5 s
2.3 s
3.1 s
3.8 s
4.6 s
5.4 s
6.1 s
Checks
15
7 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
16.0 MB transferred, 115 requests
FIX
16.0 MB transferred, 115 requests
Critical::
Page weighs 18.2 MB (16.0 MB transferred)
Warning::
Images are 2.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.3 MB
Warning::
JavaScript is 595 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 595 KB
Warning::
115 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.4 g CO2 per page load
16.0 MB / 2.4 MB budget
16.0 MB transferred
115 requests
3.4 g CO2 per page load
Other 12.7 MiB 80%
Images 2.3 MiB 15%
JavaScript 595.4 KiB 4%
CSS 168.7 KiB 1%
Fonts 157.7 KiB 1%
HTML 32.5 KiB 0%
Other 8.0 KiB 0%
Other 1.4 KiB 0%
Other 968 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (16.0 MiB of 16.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
115 resources · 16.0 MB · 224 KB savings available
FIX
115 resources · 16.0 MB · 224 KB savings available
Warning::
Page weight 15.0 MB over 1MB target
Got: 16.0 MB Expected: ≤ 1 MB
Info::
~224 KB of savings available
Warning::
114 third-party resources (100% of weight)
Info::
5 resources over 200KB
115 resources · 16.0 MiB · 114 third-party 15.0 MiB over 1MB target
Media 80% · 12.7 MiB
Image 15% · 2.3 MiB
JavaScript 4% · 595.4 KiB
CSS 1% · 168.7 KiB
Font 1% · 157.7 KiB
Document 0% · 41.1 KiB
Other 0% · 968 B

~223.9 KiB of savings available

Remove unused JavaScript: 223.9 KiB
C
Image Optimization
Action
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Warning::
https://www.etsi.org/wp-content/uploads/icon-sunri... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.etsi.org/wp-content/uploads/disributio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.etsi.org/wp-content/uploads/icon-globa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.etsi.org/wp-content/uploads/icon-peopl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
44 images 2.3 MB
0 oversized -0 KB
44 legacy format
4 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

B
JS Execution Cost
674ms total JS execution
REVIEW
674ms total JS execution
Info::
Unattributable: 213ms CPU time
Info::
https://www.etsi.org/: 188ms CPU time
Info::
https://www.etsi.org/wp-content/plugins/webtoffee-...: 107ms CPU time
Info::
https://www.etsi.org/wp-includes/js/jquery/jquery....: 98ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-L34W...: 67ms CPU time
Warning::
Third-party scripts: 674ms (100% of total)

Main Thread Breakdown

Other 31% Script Evaluation 29% Style & Layout 25% Script Parsing & Compilation 5% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable213ms4ms0ms3rd
https://www.etsi.org/188ms8ms3ms3rd
https://www.etsi.org/wp-content/plugins/webtoffee-cookie-consent/lite/frontend/js/script.min.js?ver=3.5.1107ms21ms1ms3rd
https://www.etsi.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.198ms54ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-L34WJL1P2Z&cx=c&gtm=4e64m0h267ms55ms11ms3rd
C
JS Bundles
Action
31 scripts, 224 KB unused
REVIEW
31 scripts, 224 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-L34W...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.juicer.io/embed_juicer20.js: 64 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NM6...: 62 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.etsi.org/wp-content/themes/etsi/js/swi...: 27 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 224 KB
224 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-L34WJL1P2Z&cx=c&gtm=4e64m0h2176 KB70 KB (40%)✓3rd
https://www.juicer.io/embed_juicer20.js83 KB64 KB (78%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NM67VXCX123 KB62 KB (51%)✓3rd
https://www.etsi.org/wp-content/themes/etsi/js/swiper-bundle.min.js?ver=1.043 KB27 KB (64%)✓3rd
https://www.etsi.org/wp-content/themes/etsi/js/etsi-builder-tabs-ajax.js?ver=17750315241 KB—✓3rd
https://www.etsi.org/wp-content/plugins/sfwd-lms/themes/ld30/assets/js/learndash.js?ver=5.0.413 KB—✗3rd
https://www.etsi.org/wp-content/plugins/uncanny-learndash-toolkit/src/assets/frontend/dist/bundle.min.js?ver=3.8.0.28 KB—✓3rd
https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/skins/grid/script.js?ver=5.0.41 KB—✓3rd
https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/assets/js/script.js?ver=5.0.43 KB—✓3rd
https://www.etsi.org/wp-content/plugins/learndash-certificate-verify-and-share/assets/js/frontend.js?ver=1.6.283 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

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+
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
6 fonts (158 KB)
PASS
6 fonts (158 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

158 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.5 s LCP 2.3 shttps://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-Regular.woff2SpaceGrotesk-Regular.woff2 https://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-Regular.woff2 — 30.8 KiB — 30 ms — font-display: swaphttps://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-Light.woff2SpaceGrotesk-Light.woff2 https://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-Light.woff2 — 30.0 KiB — 33 ms — font-display: swaphttps://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-Medium.woff2SpaceGrotesk-Medium.woff2 https://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-Medium.woff2 — 30.9 KiB — 38 ms — font-display: swaphttps://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-SemiBold.woff2SpaceGrotesk-SemiBold.w... https://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-SemiBold.woff2 — 30.8 KiB — 36 ms — font-display: swaphttps://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-Bold.woff2SpaceGrotesk-Bold.woff2 https://www.etsi.org/wp-content/themes/etsi/fonts/SpaceGrotesk-Bold.woff2 — 29.6 KiB — 30 ms — font-display: swaphttps://www.etsi.org/wp-content/plugins/sfwd-lms/themes/ld30/assets/fonts/ld-icons.ttf?e0vk6bld-icons.ttf https://www.etsi.org/wp-content/plugins/sfwd-lms/themes/ld30/assets/fonts/ld-icons.ttf?e0vk6b — 5.5 KiB — 55 ms — font-display: swap
SpaceGrotesk-Regular.woff2 woff2 swap
Size 31 KB
Load time 30 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
SpaceGrotesk-Light.woff2 woff2 swap
Size 30 KB
Load time 33 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
SpaceGrotesk-Medium.woff2 woff2 swap
Size 31 KB
Load time 38 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
SpaceGrotesk-SemiBold.w... woff2 swap
Size 31 KB
Load time 36 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
SpaceGrotesk-Bold.woff2 woff2 swap
Size 30 KB
Load time 30 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
ld-icons.ttf ttf swap
Size 6 KB
Load time 55 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~2 KB and ~4 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
115 requests over 3839ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.5 s LCP 2.3 shttps://etsi.org// https://etsi.org/ — 301 — 626 B — 548 ms — h2https://www.etsi.org/www.etsi.org/ https://www.etsi.org/ — 200 — 32.5 KiB — 1.9 s — h2https://www.etsi.org/wp-content/plugins/wordpress-popular-posts/assets/js/wpp.min.js?ver=7.3.8www.etsi.org/wp-content/plugins/wor... https://www.etsi.org/wp-content/plugins/wordpress-popular-posts/assets/js/wpp.min.js?ver=7.3.8 — 200 — 1.7 KiB — 25 ms — h2https://www.etsi.org/wp-content/plugins/uncanny-learndash-toolkit/src/assets/frontend/dist/bundle.min.css?ver=3.8.0.2www.etsi.org/wp-content/plugins/unc... https://www.etsi.org/wp-content/plugins/uncanny-learndash-toolkit/src/assets/frontend/dist/bundle.min.css?ver=3.8.0.2 — 200 — 4.8 KiB — 26 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/themes/legacy/templates/learndash_quiz_front.min.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/themes/legacy/templates/learndash_quiz_front.min.css?ver=5.0.4 — 200 — 2.7 KiB — 29 ms — h2https://www.etsi.org/wp-includes/css/dashicons.min.css?ver=6.9.4www.etsi.org/wp-includes/css/dashic... https://www.etsi.org/wp-includes/css/dashicons.min.css?ver=6.9.4 — 200 — 34.7 KiB — 65 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/src/assets/dist/css/styles.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/src/assets/dist/css/styles.css?ver=5.0.4 — 200 — 3.8 KiB — 46 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/assets/css/jquery.dropdown.min.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/assets/css/jquery.dropdown.min.css?ver=5.0.4 — 200 — 752 B — 48 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/themes/legacy/templates/learndash_lesson_video.min.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/themes/legacy/templates/learndash_lesson_video.min.css?ver=5.0.4 — 200 — 618 B — 35 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/src/assets/dist/css/admin-bar/styles.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/src/assets/dist/css/admin-bar/styles.css?ver=5.0.4 — 200 — 491 B — 36 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/skins/grid/style.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/skins/grid/style.css?ver=5.0.4 — 200 — 463 B — 41 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/pagination/style.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/pagination/style.css?ver=5.0.4 — 200 — 651 B — 42 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/filter/style.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/filter/style.css?ver=5.0.4 — 200 — 1.5 KiB — 43 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/cards/grid-1/style.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/includes/course-grid/templates/cards/grid-1/style.css?ver=5.0.4 — 200 — 1.1 KiB — 37 ms — h2https://www.etsi.org/wp-content/plugins/learndash-certificate-verify-and-share/assets/css/social-buttons.css?ver=1.6.28www.etsi.org/wp-content/plugins/lea... https://www.etsi.org/wp-content/plugins/learndash-certificate-verify-and-share/assets/css/social-buttons.css?ver=1.6.28 — 200 — 4.6 KiB — 45 ms — h2https://www.etsi.org/wp-content/plugins/search-filter-pro/public/assets/css/search-filter.min.css?ver=2.5.21www.etsi.org/wp-content/plugins/sea... https://www.etsi.org/wp-content/plugins/search-filter-pro/public/assets/css/search-filter.min.css?ver=2.5.21 — 200 — 7.0 KiB — 49 ms — h2https://www.etsi.org/wp-content/plugins/wordpress-popular-posts/assets/css/wpp.css?ver=7.3.8www.etsi.org/wp-content/plugins/wor... https://www.etsi.org/wp-content/plugins/wordpress-popular-posts/assets/css/wpp.css?ver=7.3.8 — 200 — 886 B — 47 ms — h2https://www.etsi.org/wp-content/themes/etsi/style.css?ver=1776862476www.etsi.org/wp-content/themes/etsi... https://www.etsi.org/wp-content/themes/etsi/style.css?ver=1776862476 — 200 — 24.8 KiB — 67 ms — h2https://www.etsi.org/wp-content/themes/etsi/js/swiper-bundle.min.css?ver=1.0www.etsi.org/wp-content/themes/etsi... https://www.etsi.org/wp-content/themes/etsi/js/swiper-bundle.min.css?ver=1.0 — 200 — 5.1 KiB — 60 ms — h2https://www.etsi.org/wp-content/plugins/sfwd-lms/themes/ld30/assets/css/learndash.min.css?ver=5.0.4www.etsi.org/wp-content/plugins/sfw... https://www.etsi.org/wp-content/plugins/sfwd-lms/themes/ld30/assets/css/learndash.min.css?ver=5.0.4 — 200 — 25.9 KiB — 71 ms — h2https://www.etsi.org/wp-content/plugins/easy-fancybox/fancybox/1.5.4/jquery.fancybox.min.css?ver=6.9.4www.etsi.org/wp-content/plugins/eas... https://www.etsi.org/wp-content/plugins/easy-fancybox/fancybox/1.5.4/jquery.fancybox.min.css?ver=6.9.4 — 200 — 1.6 KiB — 57 ms — h2https://www.etsi.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.etsi.org/wp-includes/js/jquery/... https://www.etsi.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 31.1 KiB — 71 ms — h2https://www.etsi.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.etsi.org/wp-includes/js/jquery/... https://www.etsi.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.2 KiB — 53 ms — h2https://www.etsi.org/wp-content/plugins/ninja-forms-uploads/assets/js/nfpluginsettings.js?ver=3.3.27www.etsi.org/wp-content/plugins/nin... https://www.etsi.org/wp-content/plugins/ninja-forms-uploads/assets/js/nfpluginsettings.js?ver=3.3.27 — 200 — 748 B — 54 ms — h2https://www.etsi.org/wp-content/plugins/webtoffee-cookie-consent/lite/frontend/js/script.min.js?ver=3.5.1www.etsi.org/wp-content/plugins/web... https://www.etsi.org/wp-content/plugins/webtoffee-cookie-consent/lite/frontend/js/script.min.js?ver=3.5.1 — 200 — 13.1 KiB — 55 ms — h2https://www.etsi.org/wp-content/plugins/webtoffee-cookie-consent/lite/frontend/js/gcm.min.js?ver=3.5.1www.etsi.org/wp-content/plugins/web... https://www.etsi.org/wp-content/plugins/webtoffee-cookie-consent/lite/frontend/js/gcm.min.js?ver=3.5.1 — 200 — 2.2 KiB — 55 ms — h2https://www.etsi.org/wp-content/plugins/uncanny-learndash-toolkit/src/assets/frontend/dist/bundle.min.js?ver=3.8.0.2www.etsi.org/wp-content/plugins/unc... 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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
100% of JavaScript execution is third-party
First-party Third-party 674ms · 252KB · £7/mo
Unattributable
Other
Costly
Execution 213ms
Transfer 0 KB
Monthly Cost £2/mo
www.etsi.org
Other
Optional
Execution 188ms
Transfer 32 KB
Monthly Cost £2/mo
www.etsi.org
Other
Optional
Execution 107ms
Transfer 13 KB
Monthly Cost £1/mo
www.etsi.org
Other
Optional
Execution 98ms
Transfer 31 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 176 KB
Unused 40%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 213ms and costs ~£2/month

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

Unattributable takes 213ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

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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