Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
9.68 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
19.11 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.82 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.68 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.
19.60 s
Page Load Progression
FPage Weight BudgetAction3.6 MB transferred, 166 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
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.
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.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction7592ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.earthday.org/?fbclid=IwZXh0bgNhZW0CMTEAc3J0YwZhcHBfaWQPMTczODQ3NjQyNjcwMzcwAAEedPIw-G05D_rFDzXO8G20lmZT_jqO06ITa-E8CdosOMguExe1VjUfE2u6ch4_aem_E2xDOsE-ksn6YLRBLVJP9Q | 2261ms | 513ms | 15ms | 3rd |
| https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js?ver=1.96 | 919ms | 89ms | 10ms | 3rd |
| Unattributable | 823ms | 34ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QENXCBT7TN&cx=c>m=4e64k0 | 743ms | 539ms | 57ms | 3rd |
| https://www.earthday.org/wp-content/plugins/elementor/assets/js/frontend-modules.min.js?ver=4.0.3 | 555ms | 526ms | 5ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PZTGQFF | 392ms | 331ms | 53ms | 3rd |
| https://www.earthday.org/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=4.0.3 | 323ms | 89ms | 4ms | 3rd |
| https://www.earthday.org/cdn-cgi/challenge-platform/scripts/jsd/main.js | 308ms | 227ms | 3ms | 3rd |
| https://www.earthday.org/wp-content/plugins/unlimited-elements-for-elementor-premium/assets_libraries/owl-carousel-new/owl.carousel.min.js?ver=2.0.7 | 295ms | 47ms | 4ms | 3rd |
| https://www.earthday.org/wp-content/themes/earthday/assets/js/app-script.js?ver=1771117588 | 275ms | 154ms | 119ms | 3rd |
Showing top 10 of 14 scripts
DPage Weight InventoryAction166 resources · 3.6 MB · 211 KB savings availableFIX
~210.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 166 resources | 3.6 MiB | ||||||
BImage Optimization64 images, 0 KB saveableREVIEW
CJS BundlesAction33 scripts, 211 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-QENXCBT7TN&cx=c>m=4e64k0 | 175 KB | 63 KB (36%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PZTGQFF | 178 KB | 61 KB (34%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 34 KB (35%) | ✓ | 3rd |
| https://www.earthday.org/wp-content/themes/earthday/assets/js/app-script.js?ver=1771117588 | 323 KB | 32 KB (11%) | ✓ | 3rd |
| https://www.earthday.org/wp-content/plugins/elementor/assets/lib/swiper/v8/swiper.min.js?ver=8.4.5 | 37 KB | 21 KB (57%) | ✓ | 3rd |
| https://www.earthday.org/wp-content/plugins/happy-elementor-addons/assets/js/extension-floating-effects.min.js?ver=3.21.2 | 1 KB | — | ✓ | 3rd |
| https://www.earthday.org/wp-content/plugins/happy-elementor-addons/assets/js/extension-reading-progress-bar.min.js?ver=3.21.2 | 1 KB | — | ✓ | 3rd |
| https://www.earthday.org/wp-content/themes/earthday/js/custom.js?ver=1771607349 | 2 KB | — | ✓ | 3rd |
| https://www.earthday.org/wp-content/plugins/elementor/assets/js/webpack.runtime.min.js?ver=4.0.3 | 3 KB | — | ✓ | 3rd |
| https://www.earthday.org/wp-content/plugins/elementor/assets/js/frontend-modules.min.js?ver=4.0.3 | 15 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
BHTTP Cachingpublic, max-age=0, s-maxage=900REVIEW
public, max-age=0, s-maxage=900
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| s-maxage | 900 | CDN caches for 15 minutes |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (277 KB)PASS
Web fonts
5
277 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~52 KB and ~104 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints23 hints, 0 missing preconnectsPASS
Current Resource Hints
23 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall166 requests over 2595msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.earthday.org www.earthday.org | Other | 2261ms | 71 KB | — | €25/mo | Costly |
ajax.googleapis.com ajax.googleapis.com | Other | 919ms | 31 KB | — | €10/mo | Costly |
Unattributable Unattributable | Other | 823ms | 0 KB | — | €9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 743ms | 175 KB | 36% | €8/mo | Costly |
www.earthday.org www.earthday.org | Other | 555ms | 15 KB | — | €6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 392ms | 178 KB | 34% | €4/mo | Costly |
www.earthday.org www.earthday.org | Other | 323ms | 10 KB | — | €4/mo | Costly |
www.earthday.org www.earthday.org | Other | 308ms | 0 KB | — | €3/mo | Costly |
www.earthday.org www.earthday.org | Other | 295ms | 14 KB | — | €3/mo | Costly |
www.earthday.org www.earthday.org | Other | 275ms | 323 KB | 11% | €3/mo | Costly |
www.earthday.org www.earthday.org | Other | 244ms | 296 KB | — | €3/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 166ms | 97 KB | 35% | €2/mo | Optional |
www.earthday.org www.earthday.org | Other | 144ms | 1 KB | — | €2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 143ms | 45 KB | — | €2/mo | Optional |
These scripts may cost more than they're worth
- www.earthday.org adds 2261ms and costs ~€25/month
- ajax.googleapis.com adds 919ms and costs ~€10/month
- Unattributable adds 823ms and costs ~€9/month
- Google Tag Manager adds 743ms and costs ~€8/month
- www.earthday.org adds 555ms and costs ~€6/month
- Google Tag Manager adds 392ms and costs ~€4/month
- www.earthday.org adds 323ms and costs ~€4/month
- www.earthday.org adds 308ms and costs ~€3/month
- www.earthday.org adds 295ms and costs ~€3/month
- www.earthday.org adds 275ms and costs ~€3/month
- www.earthday.org adds 244ms and costs ~€3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 2261ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
ajax.googleapis.com takes 919ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 823ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 743ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.earthday.org takes 555ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 392ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.earthday.org takes 323ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.earthday.org takes 308ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.earthday.org takes 295ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.earthday.org takes 275ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.earthday.org takes 244ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev