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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
55
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.

3.89 s

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

7.44 s

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

290 ms

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

0.014

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

8.03 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.

12.81 s

Page Load Progression

792 ms
1.6 s
2.4 s
3.2 s
4.0 s
4.8 s
5.5 s
6.3 s
Checks
17
9 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
12.0 MB transferred, 102 requests
FIX
12.0 MB transferred, 102 requests
Critical::
Page weighs 17.1 MB (12.0 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Warning::
JavaScript is 597 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 597 KB
Warning::
102 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.5 g CO2 per page load
12.0 MB / 2.4 MB budget
12.0 MB transferred
102 requests
2.5 g CO2 per page load
Other 9.8 MiB 82%
Images 1.2 MiB 10%
JavaScript 596.7 KiB 5%
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 1.2 KiB 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 (12.0 MiB of 12.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3029ms total JS execution
FIX
3029ms total JS execution
Warning::
Unattributable: 876ms CPU time
Warning::
https://www.etsi.org/: 659ms CPU time
Warning::
https://www.etsi.org/wp-includes/js/jquery/jquery....: 393ms CPU time
Warning::
https://www.etsi.org/wp-content/plugins/webtoffee-...: 357ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-L34W...: 319ms CPU time
Warning::
Third-party scripts: 3029ms (100% of total)

Main Thread Breakdown

Other 31% Script Evaluation 29% Style & Layout 24% Script Parsing & Compilation 6% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable876ms15ms0ms3rd
https://www.etsi.org/659ms25ms12ms3rd
https://www.etsi.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1393ms215ms6ms3rd
https://www.etsi.org/wp-content/plugins/webtoffee-cookie-consent/lite/frontend/js/script.min.js?ver=3.5.1357ms51ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-L34WJL1P2Z&cx=c&gtm=4e64k1319ms260ms56ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NM67VXCX216ms170ms27ms3rd
https://www.juicer.io/embed_juicer20.js151ms117ms20ms3rd
https://www.etsi.org/wp-content/themes/etsi/js/swiper-bundle.min.js?ver=1.058ms11ms14ms3rd
D
Page Weight Inventory
Action
102 resources · 12.0 MB · 220 KB savings available
FIX
102 resources · 12.0 MB · 220 KB savings available
Warning::
Page weight 11.0 MB over 1MB target
Got: 12.0 MB Expected: ≤ 1 MB
Info::
~220 KB of savings available
Warning::
101 third-party resources (100% of weight)
Info::
5 resources over 200KB
102 resources · 12.0 MiB · 101 third-party 11.0 MiB over 1MB target
Media 82% · 9.8 MiB
Image 10% · 1.2 MiB
JavaScript 5% · 596.7 KiB
CSS 1% · 168.7 KiB
Font 1% · 157.7 KiB
Document 0% · 41.4 KiB
Other 0% · 972 B

~219.7 KiB of savings available

Remove unused JavaScript: 219.7 KiB
B
Image Optimization
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 1.2 MB
0 oversized -0 KB
29 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

C
JS Bundles
Action
31 scripts, 220 KB unused
REVIEW
31 scripts, 220 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-L34W...: 65 KB unused (37%)
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: 220 KB
220 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-L34WJL1P2Z&cx=c&gtm=4e64k1176 KB65 KB (37%)✓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.juicer.io/embed/etsi/wp-plugin-1-12.js?nojquery=true&per=3&pages=3&ver=6.9.46 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 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.9 s LCP 7.4 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 — 102 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 — 91 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 — 99 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 — 102 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 — 102 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 — 131 ms — font-display: swap
SpaceGrotesk-Regular.woff2 woff2 swap
Size 31 KB
Load time 102 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
SpaceGrotesk-Light.woff2 woff2 swap
Size 30 KB
Load time 91 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
SpaceGrotesk-Medium.woff2 woff2 swap
Size 31 KB
Load time 99 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
SpaceGrotesk-SemiBold.w... woff2 swap
Size 31 KB
Load time 102 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
SpaceGrotesk-Bold.woff2 woff2 swap
Size 30 KB
Load time 102 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
ld-icons.ttf ttf swap
Size 6 KB
Load time 131 ms
Start 3.1 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+
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

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
102 requests over 4151ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.9 s LCP 7.4 shttps://etsi.org// https://etsi.org/ — 301 — 630 B — 608 ms — h2https://www.etsi.org/www.etsi.org/ https://www.etsi.org/ — 200 — 32.5 KiB — 1.8 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 — 94 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 — 105 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 — 102 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 — 34.6 KiB — 134 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 — 3.9 KiB — 117 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 — 778 B — 111 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 — 712 B — 114 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 — 495 B — 128 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 — 467 B — 106 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 — 663 B — 120 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 — 134 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 — 1.2 KiB — 102 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 — 110 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 — 6.9 KiB — 131 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 — 874 B — 134 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 — 24.7 KiB — 37 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 — 5.0 KiB — 115 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 — 26.0 KiB — 115 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 — 126 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 — 130 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 — 115 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 — 808 B — 125 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 — 13.2 KiB — 124 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 — 125 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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https://region1.google-analytics.com/g/collect?v=2&tid=G-L34WJL1P2Z&gtm=45je64k1v889041124z89232855316za20gzb9232855316zd9232855316&_p=1776900038559&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dZDk4Nz&_eu=AAAAAGA&_ng=1&_prs=ok&are=1&cid=1908550575.1776900039&frm=0&pscdl=denied&rcb=7&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=0~115616986~115938465~115938469~117266401~117512542&sid=1776900038&sct=1&seg=0&dl=https%3A%2F%2Fwww.etsi.org%2F&dt=Welcome%20-%20ETSI&en=page_view&_fv=2&_nsi=1&_ss=1&_c=1&tfd=3429 — 204 — 547 B — 116 ms — h2https://region1.google-analytics.com/measurement/conversion?random=1776900038933&cv=11&tid=G-L34WJL1P2Z&fst=1776900038933&fmt=8&en=page_view&gtm=45je64k1v889041124z89232855316za20gzb9232855316zd9232855316xec&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266401~117512542&u_w=412&u_h=823&url=https%3A%2F%2Fwww.etsi.org%2F&gacid=1908550575.1776900039&frm=0&tiba=Welcome%20-%20ETSI&gdid=dZDk4Nz&npa=1&_ng=1&pscdl=denied&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&rcb=7region1.google-analytics.com/measur... 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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 3029ms · 503KB · £31/mo
Unattributable
Other
Costly
Execution 876ms
Transfer 0 KB
Monthly Cost £9/mo
www.etsi.org
Other
Costly
Execution 659ms
Transfer 32 KB
Monthly Cost £7/mo
www.etsi.org
Other
Costly
Execution 393ms
Transfer 31 KB
Monthly Cost £4/mo
www.etsi.org
Other
Costly
Execution 357ms
Transfer 13 KB
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 319ms
Transfer 176 KB
Unused 37%
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 216ms
Transfer 123 KB
Unused 51%
Monthly Cost £2/mo
www.juicer.io
Other
Optional
Execution 151ms
Transfer 83 KB
Unused 78%
Monthly Cost £2/mo
www.etsi.org
Other
Optional
Execution 58ms
Transfer 43 KB
Unused 64%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 876ms and costs ~£9/month
  • www.etsi.org adds 659ms and costs ~£7/month
  • www.etsi.org adds 393ms and costs ~£4/month
  • www.etsi.org adds 357ms and costs ~£4/month
  • Google Tag Manager adds 319ms and costs ~£3/month
  • Google Tag Manager adds 216ms 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 876ms 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

www.etsi.org takes 659ms 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

www.etsi.org takes 393ms 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

www.etsi.org takes 357ms 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

Google Tag Manager takes 319ms 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

Google Tag Manager takes 216ms 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

51% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

78% of www.juicer.io's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

64% of www.etsi.org's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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