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https://raspberrypi.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

921 ms

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

1.17 s

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

21 ms

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

0.003

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

2.33 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.

2.14 s

Page Load Progression

416 ms
832 ms
1.2 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 81 requests
FIX
3.1 MB transferred, 81 requests
Warning::
Page weighs 4.6 MB (3.1 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::
Fonts are 727 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 727 KB
Warning::
JavaScript is 528 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 528 KB
Info::
81 HTTP requests
Info::
Estimated 0.64 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
81 requests
0.64 g CO2 per page load
Images 1.7 MiB 57%
Fonts 726.5 KiB 23%
JavaScript 528.5 KiB 17%
CSS 58.9 KiB 2%
HTML 12.6 KiB 0%
Other 5.3 KiB 0%
Other 2.3 KiB 0%
Other 1.0 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
81 resources · 3.1 MB · 180 KB savings available
FIX
81 resources · 3.1 MB · 180 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~180 KB of savings available
Warning::
80 third-party resources (100% of weight)
Info::
4 resources over 200KB
81 resources · 3.1 MiB · 80 third-party 2.1 MiB over 1MB target
Image 57% · 1.8 MiB
Font 23% · 726.5 KiB
JavaScript 17% · 528.5 KiB
CSS 2% · 58.9 KiB
Document 0% · 13.8 KiB
Other 0% · 2.2 KiB

~179.7 KiB of savings available

Remove unused JavaScript: 179.7 KiB
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
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Warning::
https://www.raspberrypi.org/assets/components/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.raspberrypi.org/assets/components/site... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
28 images 1.7 MB
0 oversized -0 KB
7 legacy format
2 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

B
JS Execution Cost
639ms total JS execution
REVIEW
639ms total JS execution
Info::
https://consent.cookiebot.com/uc.js?cbid=1e9a6bdd-...: 179ms CPU time
Info::
Unattributable: 172ms CPU time
Info::
https://www.raspberrypi.org/: 140ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-MDT1...: 86ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PRN...: 62ms CPU time
Warning::
Third-party scripts: 639ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 27% Style & Layout 16% Parse HTML & CSS 11% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://consent.cookiebot.com/uc.js?cbid=1e9a6bdd-5870-4d54-8e5f-adcf6b5c5499&implementation=gtm&consentmode-dataredaction=dynamic179ms104ms4ms3rd
Unattributable172ms7ms0ms3rd
https://www.raspberrypi.org/140ms3ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MDT17TBCEB&cx=c&gtm=4e64k0h286ms71ms14ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PRNJZ4J62ms45ms16ms3rd
C
JS Bundles
Action
34 scripts, 180 KB unused
REVIEW
34 scripts, 180 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MDT1...: 69 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PRN...: 62 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.cookiebot.com/1e9a6bdd-5870-4d54-8...: 26 KB unused (23%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.cookiebot.com/uc.js?cbid=1e9a6bdd-...: 23 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 180 KB
180 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-MDT17TBCEB&cx=c&gtm=4e64k0h2175 KB69 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PRNJZ4J130 KB62 KB (48%)✓3rd
https://consent.cookiebot.com/1e9a6bdd-5870-4d54-8e5f-adcf6b5c5499/cc.js?renew=false&referer=www.raspberrypi.org&dnt=false&init=false112 KB26 KB (23%)✓3rd
https://consent.cookiebot.com/uc.js?cbid=1e9a6bdd-5870-4d54-8e5f-adcf6b5c5499&implementation=gtm&consentmode-dataredaction=dynamic36 KB23 KB (66%)✓3rd
https://www.raspberrypi.org/assets/application/flavors/index-9c747488857e9c40b9d37c7b917e5b4e69c352fe32e8b8438836739e48ee4363.js1 KB—✓3rd
https://www.raspberrypi.org/assets/components/site/user_session-5841a6b53e06d15792356a105e9bed87a94613a5252892d54b1d01d540d9536c.js1 KB—✓3rd
https://www.raspberrypi.org/assets/turbo.min-8baa4be72b9b3b06080c07837434507cb5d575a03a8a24f0b57ca2291f835772.js28 KB—✓3rd
https://www.raspberrypi.org/assets/stimulus.min-db071f6abc13bd6dcc6bb5e9ef6cb5b8ac23c9428c059f7e8d602325937dde40.js11 KB—✓3rd
https://www.raspberrypi.org/assets/stimulus-loading-9baa52ea3b2eb0f7e14ff9ae46eab356ff4331366fa1dbfe77cc1993bffd48e6.js1 KB—✓3rd
https://www.raspberrypi.org/assets/controllers/application-32728f7b51246eb74f92f6592376d76400800637106c6cd6097277e862a75ad6.js1 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
2 fonts (727 KB)
PASS
2 fonts (727 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

727 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 921 ms LCP 1.2 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 36 ms — font-display: swaphttps://fonts.gstatic.com/l/font?kit=gNMVW2J8Roq16WD5tFNRaeLQk6-SHQ_R00k4aWHSSmlN48ykJIXwhO2KrxPIdkxyeJE0F5o&skey=b2b11cf3b396438f&v=v325font https://fonts.gstatic.com/l/font?kit=gNMVW2J8Roq16WD5tFNRaeLQk6-SHQ_R00k4aWHSSmlN48ykJIXwhO2KrxPIdkxyeJE0F5o&skey=b2b11cf3b396438f&v=v325 — 689.8 KiB — 124 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 36 ms
Start 401 ms
Risk FOUT — text flashes from fallback to web font
font woff2 swap
Size 690 KB
Load time 124 ms
Start 416 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 ~345 KB and ~690 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

Network Waterfall
81 requests over 2755ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 921 ms LCP 1.2 shttps://raspberrypi.org// https://raspberrypi.org/ — 301 — 146 B — 108 ms — h2https://www.raspberrypi.org/www.raspberrypi.org/ https://www.raspberrypi.org/ — 200 — 12.6 KiB — 46 ms — h2https://www.raspberrypi.org/assets/application-90f2f45b5c65e09f5d99e57e06b797b95a951376ede6886ed508b5588410896c.csswww.raspberrypi.org/assets/applicat... https://www.raspberrypi.org/assets/application-90f2f45b5c65e09f5d99e57e06b797b95a951376ede6886ed508b5588410896c.css — 200 — 55.3 KiB — 41 ms — h2https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,500;0,700;1,400;1,500&family=Roboto+Slab:wght@400;700&family=Rubik:wght@300;400;500;700&family=Space+Mono&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,500;0,700;1,400;1,500&family=Roboto+Slab:wght@400;700&family=Rubik:wght@300;400;500;700&family=Space+Mono&display=swap — 200 — 2.7 KiB — 126 ms — h2https://fonts.googleapis.com/css2?family=Material+Symbols+Sharp:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200&display=block&text=open_iwarfdlutchvgfonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Material+Symbols+Sharp:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200&display=block&text=open_iwarfdlutchvg — 200 — 880 B — 120 ms — h2https://ga.jspm.io/npm:es-module-shims@1.10.0/dist/es-module-shims.jsga.jspm.io/npm:es-module-shims@1.10... https://ga.jspm.io/npm:es-module-shims@1.10.0/dist/es-module-shims.js — 200 — 12.8 KiB — 129 ms — h2https://www.raspberrypi.org/assets/controllers/rpi_turnstile/turnstile_controller-46c7d30bcb2cab4ac816a5ae1223b7a0fe7a29b48734220dbc03364856d97721.jswww.raspberrypi.org/assets/controll... https://www.raspberrypi.org/assets/controllers/rpi_turnstile/turnstile_controller-46c7d30bcb2cab4ac816a5ae1223b7a0fe7a29b48734220dbc03364856d97721.js — 200 — 1.0 KiB — 49 ms — h2https://www.raspberrypi.org/assets/application-12a96d8179b877ef53042ffd027751cbcb335a39e270cc68150719267ced0a12.jswww.raspberrypi.org/assets/applicat... https://www.raspberrypi.org/assets/application-12a96d8179b877ef53042ffd027751cbcb335a39e270cc68150719267ced0a12.js — 200 — 691 B — 45 ms — h2https://www.raspberrypi.org/assets/entrypoints/application_critical-4750709a1085b15b56a34fe50599ff3824b1065768ccc8da5cf0a3561f35369e.jswww.raspberrypi.org/assets/entrypoi... https://www.raspberrypi.org/assets/entrypoints/application_critical-4750709a1085b15b56a34fe50599ff3824b1065768ccc8da5cf0a3561f35369e.js — 200 — 636 B — 50 ms — h2https://www.raspberrypi.org/assets/entrypoints/component_previews-7714202291b6f85e910533a5c021764053275a4f3bc678427e6abe459dfcb7ca.jswww.raspberrypi.org/assets/entrypoi... https://www.raspberrypi.org/assets/entrypoints/component_previews-7714202291b6f85e910533a5c021764053275a4f3bc678427e6abe459dfcb7ca.js — 200 — 468 B — 54 ms — h2https://www.raspberrypi.org/assets/entrypoints/home-d67f7b1fdc460970ac0281cac448926f1e13ebbd887d977b5b59bfe36d2fc5bc.jswww.raspberrypi.org/assets/entrypoi... https://www.raspberrypi.org/assets/entrypoints/home-d67f7b1fdc460970ac0281cac448926f1e13ebbd887d977b5b59bfe36d2fc5bc.js — 200 — 626 B — 45 ms — h2https://www.raspberrypi.org/assets/turbo.min-8baa4be72b9b3b06080c07837434507cb5d575a03a8a24f0b57ca2291f835772.jswww.raspberrypi.org/assets/turbo.mi... https://www.raspberrypi.org/assets/turbo.min-8baa4be72b9b3b06080c07837434507cb5d575a03a8a24f0b57ca2291f835772.js — 200 — 28.2 KiB — 60 ms — h2https://www.raspberrypi.org/assets/stimulus.min-db071f6abc13bd6dcc6bb5e9ef6cb5b8ac23c9428c059f7e8d602325937dde40.jswww.raspberrypi.org/assets/stimulus... https://www.raspberrypi.org/assets/stimulus.min-db071f6abc13bd6dcc6bb5e9ef6cb5b8ac23c9428c059f7e8d602325937dde40.js — 200 — 11.1 KiB — 61 ms — h2https://www.raspberrypi.org/assets/stimulus-loading-9baa52ea3b2eb0f7e14ff9ae46eab356ff4331366fa1dbfe77cc1993bffd48e6.jswww.raspberrypi.org/assets/stimulus... https://www.raspberrypi.org/assets/stimulus-loading-9baa52ea3b2eb0f7e14ff9ae46eab356ff4331366fa1dbfe77cc1993bffd48e6.js — 200 — 1.2 KiB — 54 ms — h2https://www.raspberrypi.org/assets/controllers/application-32728f7b51246eb74f92f6592376d76400800637106c6cd6097277e862a75ad6.jswww.raspberrypi.org/assets/controll... https://www.raspberrypi.org/assets/controllers/application-32728f7b51246eb74f92f6592376d76400800637106c6cd6097277e862a75ad6.js — 200 — 610 B — 57 ms — h2https://www.raspberrypi.org/assets/controllers/index-3ebb39a2432df08f6a61160ddfadec2416b98cffefc3ae2816264675a0b61a2d.jswww.raspberrypi.org/assets/controll... https://www.raspberrypi.org/assets/controllers/index-3ebb39a2432df08f6a61160ddfadec2416b98cffefc3ae2816264675a0b61a2d.js — 200 — 553 B — 51 ms — h2https://www.raspberrypi.org/assets/controllers/rating_controller-f4a956084bfc5339791208dfe0f62bc50c8a0f953aede70f9dd246d89db08843.jswww.raspberrypi.org/assets/controll... https://www.raspberrypi.org/assets/controllers/rating_controller-f4a956084bfc5339791208dfe0f62bc50c8a0f953aede70f9dd246d89db08843.js — 200 — 935 B — 55 ms — h2https://www.raspberrypi.org/assets/controllers/subscribe_controller-53f65e8207bd332d8c46eea96e86ff8f764701adf6fb6b4261951b9be5eb1b91.jswww.raspberrypi.org/assets/controll... https://www.raspberrypi.org/assets/controllers/subscribe_controller-53f65e8207bd332d8c46eea96e86ff8f764701adf6fb6b4261951b9be5eb1b91.js — 200 — 571 B — 63 ms — h2https://www.raspberrypi.org/assets/controllers/turnstile_controller-46f1cbbc705293fdca2db6dcb1798658930a4fdb2cdcad10c01c10d5f4e89a45.jswww.raspberrypi.org/assets/controll... https://www.raspberrypi.org/assets/controllers/turnstile_controller-46f1cbbc705293fdca2db6dcb1798658930a4fdb2cdcad10c01c10d5f4e89a45.js — 200 — 958 B — 61 ms — h2https://www.raspberrypi.org/assets/application/flavors/component-5fb5b8903d42418c4052571d7799c1f8deed14716131f07b6c11c04df82ccb25.jswww.raspberrypi.org/assets/applicat... https://www.raspberrypi.org/assets/application/flavors/component-5fb5b8903d42418c4052571d7799c1f8deed14716131f07b6c11c04df82ccb25.js — 200 — 661 B — 70 ms — h2https://www.raspberrypi.org/assets/application/flavors/controller-4c20f971a1732e2b4d3ba11cb7a9afdfc3216ce17b9f3694482f8cf584cbd4c2.jswww.raspberrypi.org/assets/applicat... https://www.raspberrypi.org/assets/application/flavors/controller-4c20f971a1732e2b4d3ba11cb7a9afdfc3216ce17b9f3694482f8cf584cbd4c2.js — 200 — 927 B — 64 ms — h2https://www.raspberrypi.org/assets/application/flavors/index-9c747488857e9c40b9d37c7b917e5b4e69c352fe32e8b8438836739e48ee4363.jswww.raspberrypi.org/assets/applicat... https://www.raspberrypi.org/assets/application/flavors/index-9c747488857e9c40b9d37c7b917e5b4e69c352fe32e8b8438836739e48ee4363.js — 200 — 535 B — 67 ms — h2https://www.raspberrypi.org/assets/application/flavors/state-1bfbdf6abb606ee1539b4b1cd5fd002a15aceb906260438eadf8ea5b720ca1ef.jswww.raspberrypi.org/assets/applicat... https://www.raspberrypi.org/assets/application/flavors/state-1bfbdf6abb606ee1539b4b1cd5fd002a15aceb906260438eadf8ea5b720ca1ef.js — 200 — 368 B — 71 ms — h2https://www.raspberrypi.org/assets/components/site/header-151d07ac258a55bf4c7ee6fa5e1d478e6babd33590d6523c655131f495a5c5f7.jswww.raspberrypi.org/assets/componen... https://www.raspberrypi.org/assets/components/site/header-151d07ac258a55bf4c7ee6fa5e1d478e6babd33590d6523c655131f495a5c5f7.js — 200 — 1.0 KiB — 76 ms — h2https://www.raspberrypi.org/assets/components/site/user_session-5841a6b53e06d15792356a105e9bed87a94613a5252892d54b1d01d540d9536c.jswww.raspberrypi.org/assets/componen... https://www.raspberrypi.org/assets/components/site/user_session-5841a6b53e06d15792356a105e9bed87a94613a5252892d54b1d01d540d9536c.js — 200 — 649 B — 73 ms — h2https://www.raspberrypi.org/assets/components/site/video-0a4aed001050e9851daaf428a73e77e67205bb4e27aa06bf7a3c098e12a003c5.jswww.raspberrypi.org/assets/componen... https://www.raspberrypi.org/assets/components/site/video-0a4aed001050e9851daaf428a73e77e67205bb4e27aa06bf7a3c098e12a003c5.js — 200 — 674 B — 85 ms — h2https://www.raspberrypi.org/assets/components/ui/blog_post-1cdc29c693a00afe5f8a6de98f45736380741b54504e0ed7b12a431037292bcf.jswww.raspberrypi.org/assets/componen... https://www.raspberrypi.org/assets/components/ui/blog_post-1cdc29c693a00afe5f8a6de98f45736380741b54504e0ed7b12a431037292bcf.js — 200 — 749 B — 77 ms — h2https://www.raspberrypi.org/assets/components/ui/image-1d9470485dd1c6907b0b689b0bb626e1446d526ffb9986bfa864ac3121b94737.jswww.raspberrypi.org/assets/componen... https://www.raspberrypi.org/assets/components/ui/image-1d9470485dd1c6907b0b689b0bb626e1446d526ffb9986bfa864ac3121b94737.js — 200 — 376 B — 83 ms — h2https://ga.jspm.io/npm:instant.page@5.2.0/instantpage.jsga.jspm.io/npm:instant.page@5.2.0/i... https://ga.jspm.io/npm:instant.page@5.2.0/instantpage.js — 200 — 1.7 KiB — 120 ms — h2https://ga.jspm.io/npm:picturefill@3.0.3/dist/picturefill.jsga.jspm.io/npm:picturefill@3.0.3/di... https://ga.jspm.io/npm:picturefill@3.0.3/dist/picturefill.js — 200 — 5.6 KiB — 121 ms — h2
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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 639ms · 353KB · €7/mo
consent.cookiebot.com
Other
Optional
Execution 179ms
Transfer 36 KB
Unused 66%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 172ms
Transfer 0 KB
Monthly Cost €2/mo
www.raspberrypi.org
Other
Optional
Execution 140ms
Transfer 13 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 86ms
Transfer 175 KB
Unused 39%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 62ms
Transfer 130 KB
Unused 48%
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

66% of consent.cookiebot.com'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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