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https://earthday.org

Performance

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

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

Mobile Desktop
86
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
45
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.

1.54 s

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

1.64 s

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

76 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.

1.72 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.

3.70 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
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 169 requests
FIX
3.4 MB transferred, 169 requests
Warning::
Page weighs 10.0 MB (3.4 MB transferred)
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
CSS is 527 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 527 KB
Info::
Fonts are 277 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 277 KB
Warning::
169 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.70 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
169 requests
0.70 g CO2 per page load
Images 1.5 MiB 44%
JavaScript 1.0 MiB 30%
CSS 527.1 KiB 15%
Fonts 276.6 KiB 8%
HTML 73.3 KiB 2%
Other 4.7 KiB 0%
Other 2.0 KiB 0%
Other 1.5 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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (3.3 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
Page Weight Inventory
Action
169 resources · 3.4 MB · 211 KB savings available
FIX
169 resources · 3.4 MB · 211 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~211 KB of savings available
Warning::
167 third-party resources (99% of weight)
Info::
2 resources over 200KB
169 resources · 3.4 MiB · 167 third-party 2.4 MiB over 1MB target
Image 44% · 1.5 MiB
JavaScript 30% · 1.0 MiB
CSS 15% · 527.1 KiB
Font 8% · 276.6 KiB
Document 2% · 74.3 KiB
Other 0% · 3.7 KiB

~211.2 KiB of savings available

Remove unused JavaScript: 211.2 KiB
C
Image Optimization
Action
67 images, 0 KB saveable
REVIEW
67 images, 0 KB saveable
Warning::
https://www.earthday.org/wp-content/uploads/2024/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.earthday.org/wp-content/uploads/2024/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
67 images 1.5 MB
0 oversized -0 KB
15 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

C
JS Execution Cost
Action
1867ms total JS execution
REVIEW
1867ms total JS execution
Warning::
https://www.earthday.org/: 690ms CPU time
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/3.4.1...: 264ms CPU time
Info::
Unattributable: 205ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-QENX...: 140ms CPU time
Info::
https://www.earthday.org/wp-content/plugins/elemen...: 127ms CPU time
Warning::
Third-party scripts: 1867ms (100% of total)

Main Thread Breakdown

Script Evaluation 32% Style & Layout 28% Other 28% Parse HTML & CSS 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.earthday.org/690ms114ms4ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js?ver=1.96264ms18ms2ms3rd
Unattributable205ms4ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QENXCBT7TN&cx=c&gtm=4e64k0140ms97ms12ms3rd
https://www.earthday.org/wp-content/plugins/elementor/assets/js/frontend-modules.min.js?ver=4.0.3127ms112ms1ms3rd
https://www.earthday.org/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=4.0.3113ms22ms1ms3rd
https://www.earthday.org/wp-content/plugins/unlimited-elements-for-elementor-premium/assets_libraries/owl-carousel-new/owl.carousel.min.js?ver=2.0.7101ms14ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PZTGQFF100ms86ms12ms3rd
https://www.earthday.org/wp-content/themes/earthday/assets/js/app-script.js?ver=177111758864ms34ms30ms3rd
https://www.earthday.org/cdn-cgi/challenge-platform/scripts/jsd/main.js60ms58ms1ms3rd
C
JS Bundles
Action
33 scripts, 211 KB unused
REVIEW
33 scripts, 211 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QENX...: 63 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PZT...: 61 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 34 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.earthday.org/wp-content/themes/earthda...: 32 KB unused (11%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.earthday.org/wp-content/plugins/elemen...: 21 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 211 KB
211 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-QENXCBT7TN&cx=c&gtm=4e64k0175 KB63 KB (36%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PZTGQFF178 KB61 KB (34%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (36%)✓3rd
https://www.earthday.org/wp-content/themes/earthday/assets/js/app-script.js?ver=1771117588323 KB32 KB (11%)✓3rd
https://www.earthday.org/wp-content/plugins/elementor/assets/lib/swiper/v8/swiper.min.js?ver=8.4.537 KB21 KB (57%)✓3rd
https://www.earthday.org/wp-content/plugins/happy-elementor-addons/assets/js/extension-floating-effects.min.js?ver=3.21.21 KB—✓3rd
https://www.earthday.org/wp-content/plugins/happy-elementor-addons/assets/js/extension-reading-progress-bar.min.js?ver=3.21.21 KB—✓3rd
https://www.earthday.org/wp-content/themes/earthday/js/custom.js?ver=17716073492 KB—✓3rd
https://www.earthday.org/wp-content/plugins/elementor/assets/js/webpack.runtime.min.js?ver=4.0.33 KB—✓3rd
https://www.earthday.org/wp-content/plugins/elementor/assets/js/frontend-modules.min.js?ver=4.0.315 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

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

B
HTTP Caching
public, max-age=0, s-maxage=900
REVIEW
public, max-age=0, s-maxage=900
Info::
Cache-Control header is set
Got: public, max-age=0, s-maxage=900
Info::
CDN TTL: 15 minutes (s-maxage=900)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, s-maxage=900

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
s-maxage900CDN caches for 15 minutes
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
5 fonts (277 KB)
PASS
5 fonts (277 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

277 KB total

Render-blocking

0

of 5

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 FCP 1.5 s LCP 1.6 shttps://www.earthday.org/wp-content/uploads/elementor/google-fonts/fonts/montserrat-jtusjig1_i6t8kchkm459wlhyw.woff2montserrat-jtusjig1_i6t... https://www.earthday.org/wp-content/uploads/elementor/google-fonts/fonts/montserrat-jtusjig1_i6t8kchkm459wlhyw.woff2 — 37.3 KiB — 45 ms — font-display: swaphttps://www.earthday.org/wp-content/plugins/elementor/assets/lib/font-awesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.earthday.org/wp-content/plugins/elementor/assets/lib/font-awesome/webfonts/fa-solid-900.woff2 — 76.8 KiB — 48 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 45.0 KiB — 45 ms — font-display: swaphttps://www.earthday.org/wp-content/plugins/elementor/assets/lib/eicons/fonts/eicons.woff2?5.48.0eicons.woff2 https://www.earthday.org/wp-content/plugins/elementor/assets/lib/eicons/fonts/eicons.woff2?5.48.0 — 103.7 KiB — 31 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 25 ms — font-display: swap
montserrat-jtusjig1_i6t... woff2 swap
Size 37 KB
Load time 45 ms
Start 604 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 77 KB
Load time 48 ms
Start 607 ms
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 45 KB
Load time 45 ms
Start 607 ms
Risk FOUT — text flashes from fallback to web font
eicons.woff2 woff2 swap
Size 104 KB
Load time 31 ms
Start 694 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
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 25 ms
Start 920 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~52 KB and ~104 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
169 requests over 2686ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.5 s LCP 1.6 shttps://earthday.org// https://earthday.org/ — 301 — 1011 B — 125 ms — h2https://www.earthday.org/www.earthday.org/ https://www.earthday.org/ — 200 — 70.8 KiB — 126 ms — h2https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700&family=Roboto:wght@400;500;700&display=swapfonts.googleapis.com/css2?family=Mo... https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600;700&family=Roboto:wght@400;500;700&display=swap — 200 — 1.9 KiB — 131 ms — h2https://fonts.googleapis.com/css?family=Roboto%20Condensed%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic&display=swapfonts.googleapis.com/css?family=Rob... https://fonts.googleapis.com/css?family=Roboto%20Condensed%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic&display=swap — 200 — 1.8 KiB — 130 ms — h2https://www.earthday.org/wp-content/uploads/2026/02/Untitled-design-copy-3.jpgwww.earthday.org/wp-content/uploads... https://www.earthday.org/wp-content/uploads/2026/02/Untitled-design-copy-3.jpg — 200 — 39.6 KiB — 155 ms — h2https://www.earthday.org/wp-content/cache/min/1/ajax/libs/tailwindcss/2.2.19/tailwind.min.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/ajax/libs/tailwindcss/2.2.19/tailwind.min.css?ver=1776878746 — 200 — 295.9 KiB — 153 ms — h2https://www.earthday.org/wp-content/themes/earthday/assets/css/glide.core.min.csswww.earthday.org/wp-content/themes/... https://www.earthday.org/wp-content/themes/earthday/assets/css/glide.core.min.css — 200 — 756 B — 138 ms — h2https://www.earthday.org/wp-content/cache/min/1/wp-content/themes/earthday/assets/css/glide.theme.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/wp-content/themes/earthday/assets/css/glide.theme.css?ver=1776878746 — 200 — 1.0 KiB — 138 ms — h2https://www.earthday.org/wp-content/cache/min/1/wp-content/plugins/embedpress/assets/css/embedpress.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/wp-content/plugins/embedpress/assets/css/embedpress.css?ver=1776878746 — 200 — 11.7 KiB — 138 ms — h2https://www.earthday.org/wp-content/cache/min/1/wp-content/plugins/embedpress/assets/css/blocks.build.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/wp-content/plugins/embedpress/assets/css/blocks.build.css?ver=1776878746 — 200 — 10.3 KiB — 138 ms — h2https://www.earthday.org/wp-content/cache/min/1/wp-content/plugins/wp-quiz-pro/assets/frontend/css/animate.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/wp-content/plugins/wp-quiz-pro/assets/frontend/css/animate.css?ver=1776878746 — 200 — 4.3 KiB — 138 ms — h2https://www.earthday.org/wp-content/cache/min/1/wp-content/plugins/wp-quiz-pro/assets/frontend/css/wp-quiz.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/wp-content/plugins/wp-quiz-pro/assets/frontend/css/wp-quiz.css?ver=1776878746 — 200 — 8.0 KiB — 138 ms — h2https://www.earthday.org/wp-content/cache/min/1/wp-content/themes/earthday/assets/css/app.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/wp-content/themes/earthday/assets/css/app.css?ver=1776878746 — 200 — 47.7 KiB — 136 ms — h2https://www.earthday.org/wp-content/themes/earthday/style.css?ver=6.9.4www.earthday.org/wp-content/themes/... https://www.earthday.org/wp-content/themes/earthday/style.css?ver=6.9.4 — 200 — 504 B — 138 ms — h2https://www.earthday.org/wp-content/cache/min/1/wp-content/themes/earthday/css/custom.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/wp-content/themes/earthday/css/custom.css?ver=1776878746 — 200 — 8.3 KiB — 138 ms — h2https://www.earthday.org/wp-content/cache/min/1/ajax/libs/font-awesome/6.5.0/css/all.min.css?ver=1776878746www.earthday.org/wp-content/cache/m... https://www.earthday.org/wp-content/cache/min/1/ajax/libs/font-awesome/6.5.0/css/all.min.css?ver=1776878746 — 200 — 22.5 KiB — 141 ms — h2https://www.earthday.org/wp-content/plugins/elementor/assets/css/frontend.min.css?ver=4.0.3www.earthday.org/wp-content/plugins... https://www.earthday.org/wp-content/plugins/elementor/assets/css/frontend.min.css?ver=4.0.3 — 200 — 6.9 KiB — 138 ms — h2https://www.earthday.org/wp-content/plugins/elementor/assets/css/widget-heading.min.css?ver=4.0.3www.earthday.org/wp-content/plugins... https://www.earthday.org/wp-content/plugins/elementor/assets/css/widget-heading.min.css?ver=4.0.3 — 200 — 656 B — 138 ms — h2https://www.earthday.org/wp-content/plugins/elementor/assets/lib/animations/styles/slideInRight.min.css?ver=4.0.3www.earthday.org/wp-content/plugins... https://www.earthday.org/wp-content/plugins/elementor/assets/lib/animations/styles/slideInRight.min.css?ver=4.0.3 — 200 — 492 B — 138 ms — h2https://www.earthday.org/wp-content/plugins/elementor/assets/lib/animations/styles/slideInDown.min.css?ver=4.0.3www.earthday.org/wp-content/plugins... https://www.earthday.org/wp-content/plugins/elementor/assets/lib/animations/styles/slideInDown.min.css?ver=4.0.3 — 200 — 535 B — 138 ms — h2https://www.earthday.org/wp-content/plugins/elementor/assets/lib/animations/styles/slideInUp.min.css?ver=4.0.3www.earthday.org/wp-content/plugins... https://www.earthday.org/wp-content/plugins/elementor/assets/lib/animations/styles/slideInUp.min.css?ver=4.0.3 — 200 — 483 B — 138 ms — h2https://www.earthday.org/wp-content/plugins/elementor-pro/assets/css/conditionals/popup.min.css?ver=4.0.3www.earthday.org/wp-content/plugins... https://www.earthday.org/wp-content/plugins/elementor-pro/assets/css/conditionals/popup.min.css?ver=4.0.3 — 200 — 808 B — 138 ms — h2https://www.earthday.org/wp-content/plugins/essential-addons-for-elementor-lite/assets/front-end/css/view/general.min.css?ver=6.6.2www.earthday.org/wp-content/plugins... https://www.earthday.org/wp-content/plugins/essential-addons-for-elementor-lite/assets/front-end/css/view/general.min.css?ver=6.6.2 — 200 — 1.8 KiB — 138 ms — 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https://www.facebook.com/tr/?id=419630282544224&ev=PageView&dl=https%3A%2F%2Fwww.earthday.org%2F&rl=&if=false&ts=1776889155696&sw=800&sh=600&v=2.9.303&r=stable&a=stape-gtm-1.1.1&ec=0&o=4126&fbp=fb.1.1776889155680.577638397970022590&ler=empty&cdl=API_unavailable&pmd[title]=%20%20%20%0A%09%09Earth%20Day%3A%20The%20Official%20Site%20%7C%20EARTHDAY.ORG%0A%09&pmd[locale]=en_US&pmd[description]=Visit%20the%20official%20Earth%20Day%20site%20to%20learn%20about%20the%20world%27s%20largest%20environmental%20movement%20and%20what%20you%20can%20do%20to%20make%20every%20day%20Earth%20Day.&plt=909.8999996185303&it=1776889155507&coo=false&eid=1776889637071_17768894848493&tm=1&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct2&expv2[6]=hf0&rqm=GET — 200 — 16 B — 9 ms — h3https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=419630282544224&ev=PageView&dl=https%3A%2F%2Fwww.earthday.org%2F&rl=&if=false&ts=1776889155696&sw=800&sh=600&v=2.9.303&r=stable&a=stape-gtm-1.1.1&ec=0&o=4126&fbp=fb.1.1776889155680.577638397970022590&ler=empty&cdl=API_unavailable&pmd[title]=%20%20%20%0A%09%09Earth%20Day%3A%20The%20Official%20Site%20%7C%20EARTHDAY.ORG%0A%09&pmd[locale]=en_US&pmd[description]=Visit%20the%20official%20Earth%20Day%20site%20to%20learn%20about%20the%20world%27s%20largest%20environmental%20movement%20and%20what%20you%20can%20do%20to%20make%20every%20day%20Earth%20Day.&plt=909.8999996185303&it=1776889155507&coo=false&eid=1776889637071_17768894848493&tm=1&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct2&expv2[6]=hf0&rqm=FGETwww.facebook.com/privacy_sandbox/pi... https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=419630282544224&ev=PageView&dl=https%3A%2F%2Fwww.earthday.org%2F&rl=&if=false&ts=1776889155696&sw=800&sh=600&v=2.9.303&r=stable&a=stape-gtm-1.1.1&ec=0&o=4126&fbp=fb.1.1776889155680.577638397970022590&ler=empty&cdl=API_unavailable&pmd[title]=%20%20%20%0A%09%09Earth%20Day%3A%20The%20Official%20Site%20%7C%20EARTHDAY.ORG%0A%09&pmd[locale]=en_US&pmd[description]=Visit%20the%20official%20Earth%20Day%20site%20to%20learn%20about%20the%20world%27s%20largest%20environmental%20movement%20and%20what%20you%20can%20do%20to%20make%20every%20day%20Earth%20Day.&plt=909.8999996185303&it=1776889155507&coo=false&eid=1776889637071_17768894848493&tm=1&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct2&expv2[6]=hf0&rqm=FGET — 200 — 200 B — 156 ms — h3https://region1.analytics.google.com/g/s/collect?dma=1&dma_cps=a&npa=1&gcd=13l3l3l2l1l1&gtm=45j91e64l0v876782964z8810576004z99246211302za20gzb810576004zd810576004&tag_exp=0~115938466~115938468~117266400~117512542~117704211~117884345~118167058&_is_sw=f15s0t3&_tu=BA&_gsid=QENXCBT7TNzywrpG4wuQpp9nNSAqJ_wAregion1.analytics.google.com/g/s/co... https://region1.analytics.google.com/g/s/collect?dma=1&dma_cps=a&npa=1&gcd=13l3l3l2l1l1&gtm=45j91e64l0v876782964z8810576004z99246211302za20gzb810576004zd810576004&tag_exp=0~115938466~115938468~117266400~117512542~117704211~117884345~118167058&_is_sw=f15s0t3&_tu=BA&_gsid=QENXCBT7TNzywrpG4wuQpp9nNSAqJ_wA — 204 — 505 B — 68 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&dma=1&dma_cps=a&npa=1&gcd=13l3l3l2l1l1&tid=G-QENXCBT7TN&cid=688024868.1776889156&gtm=45j91e64l0v876782964z8810576004z99246211302za20gzb810576004zd810576004&tag_exp=0~115938466~115938468~117266400~117512542~117704211~117884345~118167058&_is_sw=f15s0t3&_tu=BA&aip=1&z=808161966www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&dma=1&dma_cps=a&npa=1&gcd=13l3l3l2l1l1&tid=G-QENXCBT7TN&cid=688024868.1776889156&gtm=45j91e64l0v876782964z8810576004z99246211302za20gzb810576004zd810576004&tag_exp=0~115938466~115938468~117266400~117512542~117704211~117884345~118167058&_is_sw=f15s0t3&_tu=BA&aip=1&z=808161966 — 200 — 408 B — 79 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&dma=1&dma_cps=a&npa=1&gcd=13l3l3l2l1l1&tid=G-QENXCBT7TN&cid=688024868.1776889156&gtm=45j91e64l0v876782964z8810576004z99246211302za20gzb810576004zd810576004&tag_exp=0~115938466~115938468~117266400~117512542~117704211~117884345~118167058&_is_sw=f15s0t3&_tu=BA&aip=1stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&dma=1&dma_cps=a&npa=1&gcd=13l3l3l2l1l1&tid=G-QENXCBT7TN&cid=688024868.1776889156&gtm=45j91e64l0v876782964z8810576004z99246211302za20gzb810576004zd810576004&tag_exp=0~115938466~115938468~117266400~117512542~117704211~117884345~118167058&_is_sw=f15s0t3&_tu=BA&aip=1 — 204 — 514 B — 70 ms — h2
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 1867ms · 816KB · €20/mo
www.earthday.org
Other
Costly
Execution 690ms
Transfer 71 KB
Monthly Cost €8/mo
ajax.googleapis.com
Other
Costly
Execution 264ms
Transfer 31 KB
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 205ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 140ms
Transfer 175 KB
Unused 36%
Monthly Cost €2/mo
www.earthday.org
Other
Optional
Execution 127ms
Transfer 15 KB
Monthly Cost €1/mo
www.earthday.org
Other
Optional
Execution 113ms
Transfer 10 KB
Monthly Cost €1/mo
www.earthday.org
Other
Optional
Execution 101ms
Transfer 14 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 100ms
Transfer 178 KB
Unused 34%
Monthly Cost €1/mo
www.earthday.org
Other
Optional
Execution 64ms
Transfer 323 KB
Unused 11%
Monthly Cost €1/mo
www.earthday.org
Other
Optional
Execution 60ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.earthday.org adds 690ms and costs ~€8/month
  • ajax.googleapis.com adds 264ms and costs ~€3/month
  • Unattributable adds 205ms 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

www.earthday.org takes 690ms 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

ajax.googleapis.com takes 264ms 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

Unattributable takes 205ms 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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