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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
0
REVIEW
3
PASS
9
INFO
2

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

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

450 ms

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

563 ms

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

61 ms

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

0.021

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

550 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

569 ms

Page Load Progression

469 ms
937 ms
1.4 s
1.9 s
2.3 s
2.8 s
3.3 s
3.7 s
Checks
14
9 PASS 3 REVIEW
B
JS Execution Cost
711ms total JS execution
REVIEW
711ms total JS execution
Warning::
https://www.ecosia.org/static/indexpage/assets/chu...: 294ms CPU time
Info::
Unattributable: 220ms CPU time
Info::
https://www.ecosia.org/: 197ms CPU time
Info::
Third-party scripts: 220ms (31% of total)

Main Thread Breakdown

Script Evaluation 38% Other 35% Style & Layout 14% Script Parsing & Compilation 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.ecosia.org/static/indexpage/assets/chunks/chunk-BsOEZPgZ.js294ms230ms12ms1st
Unattributable220ms31ms0ms3rd
https://www.ecosia.org/197ms4ms1ms1st
B
JS Bundles
14 scripts, 130 KB unused
REVIEW
14 scripts, 130 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M33...: 87 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ecosia.org/static/indexpage/assets/chu...: 44 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 130 KB
130 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-M33JXB44&gtm_auth=yQLXq56VlYmlCpsDKUq5-Q&gtm_preview=env-1&gtm_cookies_win=x145 KB87 KB (60%)✓3rd
https://www.ecosia.org/static/indexpage/assets/chunks/chunk-6MlxZnMw.js56 KB44 KB (79%)✓1st
https://www.ecosia.org/static/indexpage/assets/chunks/chunk-Da8mshgT.js0 KB—✓1st
https://www.ecosia.org/static/indexpage/assets/entries/entry-server-routing.V6RSNVIv.js0 KB—✓1st
https://www.ecosia.org/static/indexpage/assets/chunks/chunk-DHUr1527.js0 KB—✓1st
https://www.ecosia.org/static/indexpage/assets/chunks/chunk-D3qP-z4Z.js0 KB—✓1st
https://www.ecosia.org/static/indexpage/assets/chunks/chunk-BsOEZPgZ.js0 KB—✓1st
https://dx.mountain.com/spx?dxver=4.0.0&shaid=38593&tdr=&plh=https%3A%2F%2Fwww.ecosia.org%2F&cb=56783689043750490term=value6 KB—✓3rd
https://www.ecosia.org/static/indexpage/assets/entries/src_pages.Cy1_b85i.js0 KB—✓1st
https://www.ecosia.org/static/indexpage/assets/chunks/chunk-DIn4Kc3O.js3 KB—✓1st

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
private, max-age=0
REVIEW
private, max-age=0
Info::
Cache-Control header is set
Got: private, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
A+
Page Weight Budget
482 KB transferred, 33 requests
PASS
482 KB transferred, 33 requests
Info::
Page weighs 1.8 MB (482 KB transferred)
Info::
33 HTTP requests
Info::
Estimated 0.10 g CO2 per page load
482 KB / 2.4 MB budget
482 KB transferred
33 requests
0.10 g CO2 per page load
JavaScript 214.8 KiB 45%
Images 124.1 KiB 26%
Fonts 83.7 KiB 17%
CSS 32.7 KiB 7%
HTML 21.8 KiB 5%
Other 2.9 KiB 1%
Other 1.6 KiB 0%
Other 696 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
33% third-party, 0 ms blocking
PASS
33% third-party, 0 ms blocking
Info::
Third-party code accounts for 33% of page weight (157.6 KiB of 482.4 KiB)
Info::
Third-party blocking time is low (0 ms)
67%
33%
First-party Third-party
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+
Image Optimization
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 124 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (84 KB)
PASS
2 fonts (84 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

84 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 450 ms LCP 563 mshttps://www.ecosia.org/static/fonts/inter/Inter.latin.woff2Inter.latin.woff2 https://www.ecosia.org/static/fonts/inter/Inter.latin.woff2 — 45.8 KiB — 0 ms — font-display: swaphttps://www.ecosia.org/static/fonts/founders-grotesk/condensed-semibold.woff2condensed-semibold.woff2 https://www.ecosia.org/static/fonts/founders-grotesk/condensed-semibold.woff2 — 37.9 KiB — 0 ms — font-display: swap
Inter.latin.woff2 woff2 swap
Size 46 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
condensed-semibold.woff2 woff2 swap
Size 38 KB
Load time 0 ms
Start 0 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)
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
33 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
31% of JavaScript execution is third-party
First-party Third-party 220ms · 0KB · $3/mo
Unattributable
Other
Costly
Execution 220ms
Transfer 0 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • Unattributable adds 220ms and costs ~$3/month

Unattributable takes 220ms 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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