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https://carbonbrief.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
78
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.
85
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.

1.31 s

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

2.22 s

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

16 ms

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

0.045

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

2.09 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.

4.47 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
7 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 169 requests
FIX
4.1 MB transferred, 169 requests
Critical::
Page weighs 12.1 MB (4.1 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 MB
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Info::
Fonts are 206 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 206 KB
Warning::
169 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.86 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
169 requests
0.86 g CO2 per page load
Images 1.8 MiB 45%
JavaScript 1.7 MiB 41%
Fonts 205.6 KiB 5%
HTML 185.0 KiB 4%
CSS 181.4 KiB 4%
Other 6.8 KiB 0%
Other 6.4 KiB 0%
Other 1.5 KiB 0%
Other 552 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

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

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 (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
69 scripts, 1.1 MB unused
FIX
69 scripts, 1.1 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 155 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 155 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 155 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 155 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 155 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1139 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB155 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB155 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB155 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB155 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB155 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB155 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-R02EV2GBVB163 KB66 KB (40%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB54 KB (69%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://platform.twitter.com/widgets.js27 KB27 KB (99%)✓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

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
Page Weight Inventory
Action
169 resources · 4.1 MB · 1.1 MB savings available
FIX
169 resources · 4.1 MB · 1.1 MB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Warning::
168 third-party resources (100% of weight)
Info::
6 resources over 200KB
169 resources · 4.1 MiB · 168 third-party 3.1 MiB over 1MB target
Image 45% · 1.8 MiB
JavaScript 41% · 1.7 MiB
Font 5% · 205.6 KiB
Document 4% · 185.6 KiB
CSS 4% · 181.4 KiB
Other 0% · 9.0 KiB

~1.1 MiB of savings available

Remove unused JavaScript: 1.1 MiB
C
Image Optimization
Action
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/themes/carb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/themes/carb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.carbonbrief.org/wp-content/uploads/202... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 1.8 MB
0 oversized -0 KB
20 legacy format
16 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

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
JS Execution Cost
Action
1038ms total JS execution
REVIEW
1038ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 472ms CPU time
Warning::
https://www.carbonbrief.org/: 254ms CPU time
Info::
Unattributable: 144ms CPU time
Info::
https://platform.twitter.com/widgets.js: 58ms CPU time
Info::
https://www.carbonbrief.org/cdn-cgi/challenge-plat...: 56ms CPU time
Warning::
Third-party scripts: 1038ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 15% Style & Layout 13% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js472ms377ms69ms3rd
https://www.carbonbrief.org/254ms19ms6ms3rd
Unattributable144ms2ms0ms3rd
https://platform.twitter.com/widgets.js58ms31ms8ms3rd
https://www.carbonbrief.org/cdn-cgi/challenge-platform/scripts/jsd/main.js56ms54ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-R02EV2GBVB55ms43ms12ms3rd
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
12 fonts (206 KB)
PASS
12 fonts (206 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

206 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.2 shttps://fonts.gstatic.com/s/ptsans/v18/jizaRExUiTo99u79D0KExcOPIDU.woff2jizaRExUiTo99u79D0KExcO... https://fonts.gstatic.com/s/ptsans/v18/jizaRExUiTo99u79D0KExcOPIDU.woff2 — 11.2 KiB — 40 ms — font-display: swaphttps://fonts.gstatic.com/s/ptsans/v18/jizfRExUiTo99u79B_mh0O6tLR8a8zI.woff2jizfRExUiTo99u79B_mh0O6... https://fonts.gstatic.com/s/ptsans/v18/jizfRExUiTo99u79B_mh0O6tLR8a8zI.woff2 — 11.4 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/ptsansnarrow/v19/BngRUXNadjH0qYEzV7ab-oWlsbCGwR2oefDo.woff2BngRUXNadjH0qYEzV7ab-oW... https://fonts.gstatic.com/s/ptsansnarrow/v19/BngRUXNadjH0qYEzV7ab-oWlsbCGwR2oefDo.woff2 — 11.2 KiB — 41 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/webfonts/fa-solid-900.woff2 — 77.1 KiB — 82 ms — font-display: swaphttps://fonts.gstatic.com/s/ptserif/v19/EJRVQgYoZZY2vCFuvAFWzr-_dSb_.woff2EJRVQgYoZZY2vCFuvAFWzr-... https://fonts.gstatic.com/s/ptserif/v19/EJRVQgYoZZY2vCFuvAFWzr-_dSb_.woff2 — 13.1 KiB — 57 ms — font-display: swaphttps://fonts.gstatic.com/s/ptsansnarrow/v19/BngSUXNadjH0qYEzV7ab-oWlsbg95AiFW_3CRs-2.woff2BngSUXNadjH0qYEzV7ab-oW... https://fonts.gstatic.com/s/ptsansnarrow/v19/BngSUXNadjH0qYEzV7ab-oWlsbg95AiFW_3CRs-2.woff2 — 11.2 KiB — 58 ms — font-display: swaphttps://fonts.mailerlite.com/fonts/s/ptserif/v19/EJRVQgYoZZY2vCFuvAFWzr-_dSb_.woff2EJRVQgYoZZY2vCFuvAFWzr-... https://fonts.mailerlite.com/fonts/s/ptserif/v19/EJRVQgYoZZY2vCFuvAFWzr-_dSb_.woff2 — 13.4 KiB — 78 ms — font-display: swaphttps://fonts.mailerlite.com/fonts/s/ptsans/v18/jizaRExUiTo99u79D0KExcOPIDU.woff2jizaRExUiTo99u79D0KExcO... https://fonts.mailerlite.com/fonts/s/ptsans/v18/jizaRExUiTo99u79D0KExcOPIDU.woff2 — 11.5 KiB — 77 ms — font-display: swaphttps://fonts.mailerlite.com/fonts/s/ptsans/v18/jizfRExUiTo99u79B_mh0O6tLR8a8zI.woff2jizfRExUiTo99u79B_mh0O6... https://fonts.mailerlite.com/fonts/s/ptsans/v18/jizfRExUiTo99u79B_mh0O6tLR8a8zI.woff2 — 11.6 KiB — 92 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 62 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 39 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
jizaRExUiTo99u79D0KExcO... woff2 swap
Size 11 KB
Load time 40 ms
Start 443 ms
Risk FOUT — text flashes from fallback to web font
jizfRExUiTo99u79B_mh0O6... woff2 swap
Size 11 KB
Load time 52 ms
Start 443 ms
Risk FOUT — text flashes from fallback to web font
BngRUXNadjH0qYEzV7ab-oW... woff2 swap
Size 11 KB
Load time 41 ms
Start 444 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 77 KB
Load time 82 ms
Start 444 ms
Risk FOUT — text flashes from fallback to web font
EJRVQgYoZZY2vCFuvAFWzr-... woff2 swap
Size 13 KB
Load time 57 ms
Start 504 ms
Risk FOUT — text flashes from fallback to web font
BngSUXNadjH0qYEzV7ab-oW... woff2 swap
Size 11 KB
Load time 58 ms
Start 504 ms
Risk FOUT — text flashes from fallback to web font
EJRVQgYoZZY2vCFuvAFWzr-... woff2 swap
Size 13 KB
Load time 78 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
jizaRExUiTo99u79D0KExcO... woff2 swap
Size 12 KB
Load time 77 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
jizfRExUiTo99u79B_mh0O6... woff2 swap
Size 12 KB
Load time 92 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 62 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 39 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.2 s
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
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=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600, must-revalidate
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
Last-Modified header present
Cache-Control

max-age=600, must-revalidate

DirectiveValueMeaning
max-age600Cache for 10 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 600 seconds
Network Waterfall
169 requests over 2412ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.2 shttps://carbonbrief.org// https://carbonbrief.org/ — 301 — 613 B — 84 ms — h2https://www.carbonbrief.org/www.carbonbrief.org/ https://www.carbonbrief.org/ — 200 — 23.7 KiB — 112 ms — h2https://www.carbonbrief.org/wp-content/themes/carbonbrief/css/bootstrap.min.csswww.carbonbrief.org/wp-content/them... https://www.carbonbrief.org/wp-content/themes/carbonbrief/css/bootstrap.min.css — 200 — 20.0 KiB — 44 ms — h2https://www.carbonbrief.org/wp-content/themes/carbonbrief/css/header-carousel.csswww.carbonbrief.org/wp-content/them... https://www.carbonbrief.org/wp-content/themes/carbonbrief/css/header-carousel.css — 200 — 1.7 KiB — 42 ms — h2https://www.carbonbrief.org/wp-content/themes/carbonbrief/css/slick.csswww.carbonbrief.org/wp-content/them... https://www.carbonbrief.org/wp-content/themes/carbonbrief/css/slick.css — 200 — 655 B — 39 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
100% of JavaScript execution is third-party
First-party Third-party 1038ms · 214KB · €11/mo
www.gstatic.com
Other
Costly
Execution 472ms
Transfer 0 KB
Unused 43%
Monthly Cost €5/mo
www.carbonbrief.org
Other
Costly
Execution 254ms
Transfer 24 KB
Monthly Cost €3/mo
Unattributable
Other
Optional
Execution 144ms
Transfer 0 KB
Monthly Cost €2/mo
Twitter/X Embed
Social
Optional
Execution 58ms
Transfer 27 KB
Unused 99%
Monthly Cost €1/mo
www.carbonbrief.org
Other
Optional
Execution 56ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 55ms
Transfer 163 KB
Unused 40%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 472ms and costs ~€5/month
  • www.carbonbrief.org adds 254ms and costs ~€3/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

www.gstatic.com takes 472ms 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.carbonbrief.org takes 254ms 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

99% of Twitter/X Embed'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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