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https://www.greenpeace.org

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
66
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.

819 ms

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

8.49 s

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

822 ms

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

0.008

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

2.23 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.

8.49 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
16
9 PASS 3 REVIEW 2 FIX
D
Third-Party Impact
Action
73% third-party, 0 ms blocking
FIX
73% third-party, 0 ms blocking
Warning::
Third-party code accounts for 73% of page weight (676.7 KiB of 923.7 KiB)
Info::
Third-party blocking time is low (0 ms)
27%
73%
First-party Third-party
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.

B
Image Optimization
4 images, 0 KB saveable
REVIEW
4 images, 0 KB saveable
Warning::
https://www.greenpeace.org/global/static/img/gp-lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 90 KB
0 oversized -0 KB
4 legacy format
1 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

C
JS Execution Cost
Action
1666ms total JS execution
REVIEW
1666ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N7S...: 470ms CPU time
Warning::
Unattributable: 275ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-99CS...: 242ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-94MR...: 239ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0CCB...: 238ms CPU time
Warning::
Third-party scripts: 1534ms (92% of total)

Main Thread Breakdown

Script Evaluation 64% Other 14% Script Parsing & Compilation 12% Style & Layout 6% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-N7SG829470ms417ms46ms3rd
Unattributable275ms10ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-99CSX66YC1&cx=c&gtm=4e6461h2242ms184ms55ms3rd
https://www.googletagmanager.com/gtag/js?id=G-94MRTN8HG4&cx=c&gtm=4e6461h2239ms195ms41ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0CCB1GTVV6&cx=c&gtm=4e6461h2238ms195ms41ms3rd
https://www.greenpeace.org/global/132ms5ms1ms1st
https://cdn.taboola.com/libtrc/unip/1710153/tfa.js69ms56ms8ms3rd
C
JS Bundles
Action
7 scripts, 253 KB unused
REVIEW
7 scripts, 253 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-99CS...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-94MR...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0CCB...: 62 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N7S...: 60 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 253 KB
253 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-99CSX66YC1&cx=c&gtm=4e6461h2170 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-94MRTN8HG4&cx=c&gtm=4e6461h2156 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0CCB1GTVV6&cx=c&gtm=4e6461h2154 KB62 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N7SG829164 KB60 KB (37%)✓3rd
https://www.greenpeace.org/global/static/main.js3 KB—✓1st
https://cdn.taboola.com/libtrc/unip/1710153/tfa.js27 KB—✓3rd
https://trc.taboola.com/1710153/trc/3/json?tim=1775592288096&data=%7B%22id%22%3A140%2C%22ii%22%3A%22%2F%22%2C%22it%22%3A%22video%22%2C%22sd%22%3Anull%2C%22ui%22%3Anull%2C%22vi%22%3A1775592288088%2C%22cv%22%3A%2220260405-6-RELEASE%22%2C%22uiv%22%3A%22default%22%2C%22u%22%3A%22https%3A%2F%2Fwww.greenpeace.org%22%2C%22e%22%3Anull%2C%22cb%22%3A%22TFASC.trkCallback%22%2C%22qs%22%3A%22%22%2C%22r%22%3A%5B%7B%22li%22%3A%22rbox-tracking%22%2C%22s%22%3A0%2C%22uim%22%3A%22rbox-tracking%3Apub%3Dibornmedialimited-y24182agreenpeace-sc%3Aabp%3D0%22%2C%22uip%22%3A%22rbox-tracking%22%2C%22orig_uip%22%3A%22rbox-tracking%22%7D%5D%2C%22mpvd%22%3A%7B%22en%22%3A%22page_view%22%2C%22tim%22%3A1775592288094%2C%22ref%22%3Anull%2C%22item-url%22%3A%22https%3A%2F%2Fwww.greenpeace.org%2Fglobal%2F%22%2C%22tos%22%3A2%2C%22ssd%22%3A1%2C%22scd%22%3A0%2C%22it%22%3A%22JS_PIXEL%22%2C%22supv%22%3Atrue%7D%2C%22pa%22%3A%7B%22su%22%3Atrue%7D%2C%22psb%22%3Atrue%7D&pubit=i2 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
Page Weight Budget
924 KB transferred, 24 requests
PASS
924 KB transferred, 24 requests
Info::
Page weighs 2.3 MB (924 KB transferred)
Warning::
JavaScript is 676 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 676 KB
Info::
24 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
924 KB / 2.4 MB budget
924 KB transferred
24 requests
0.19 g CO2 per page load
JavaScript 676.0 KiB 73%
Fonts 147.0 KiB 16%
Images 89.9 KiB 10%
CSS 5.1 KiB 1%
HTML 3.3 KiB 0%
Other 1.2 KiB 0%
Other 688 B 0%
Other 599 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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 (147 KB)
PASS
2 fonts (147 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

147 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 819 ms LCP 8.5 shttps://www.greenpeace.org/static/planet4-assets/SourceSans3.woff2SourceSans3.woff2 https://www.greenpeace.org/static/planet4-assets/SourceSans3.woff2 — 69.5 KiB — 0 ms — font-display: swaphttps://www.greenpeace.org/static/planet4-assets/GreenpeaceSans.woff2GreenpeaceSans.woff2 https://www.greenpeace.org/static/planet4-assets/GreenpeaceSans.woff2 — 77.5 KiB — 0 ms — font-display: swap
SourceSans3.woff2 woff2 swap
Size 70 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GreenpeaceSans.woff2 woff2 swap
Size 77 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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
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
24 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
92% of JavaScript execution is third-party
First-party Third-party 1534ms · 671KB · €17/mo
Google Tag Manager
Tag Manager
Costly
Execution 470ms
Transfer 164 KB
Unused 37%
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 275ms
Transfer 0 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 242ms
Transfer 170 KB
Unused 40%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 239ms
Transfer 156 KB
Unused 41%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 238ms
Transfer 154 KB
Unused 40%
Monthly Cost €3/mo
cdn.taboola.com
Other
Optional
Execution 69ms
Transfer 27 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 470ms and costs ~€5/month
  • Unattributable adds 275ms and costs ~€3/month
  • Google Tag Manager adds 242ms and costs ~€3/month
  • Google Tag Manager adds 239ms and costs ~€3/month
  • Google Tag Manager adds 238ms and costs ~€3/month

92% 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

Google Tag Manager takes 470ms 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 275ms 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

Google Tag Manager takes 242ms 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

Google Tag Manager takes 239ms 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

Google Tag Manager takes 238ms 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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