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https://www.greenpeace.org

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
99
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.

444 ms

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

823 ms

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

12 ms

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

0.010

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

569 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.

2.10 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
14
8 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
75% third-party, 0 ms blocking
FIX
75% third-party, 0 ms blocking
Warning::
Third-party code accounts for 75% of page weight (676.7 KiB of 897.3 KiB)
Info::
Third-party blocking time is low (0 ms)
25%
75%
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 63 KB
0 oversized -0 KB
3 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 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=4e6460170 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-94MRTN8HG4&cx=c&gtm=4e6460156 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0CCB1GTVV6&cx=c&gtm=4e6460154 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=1775592301479&data=%7B%22id%22%3A934%2C%22ii%22%3A%22%2F%22%2C%22it%22%3A%22video%22%2C%22sd%22%3Anull%2C%22ui%22%3Anull%2C%22vi%22%3A1775592301471%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%3A1775592301478%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
897 KB transferred, 24 requests
PASS
897 KB transferred, 24 requests
Info::
Page weighs 2.2 MB (897 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 0.18 g CO2 per page load
897 KB / 2.4 MB budget
897 KB transferred
24 requests
0.18 g CO2 per page load
JavaScript 675.9 KiB 75%
Fonts 147.0 KiB 16%
Images 63.4 KiB 7%
CSS 5.1 KiB 1%
HTML 3.4 KiB 0%
Other 1.2 KiB 0%
Other 732 B 0%
Other 608 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+
JS Execution Cost
432ms total JS execution
PASS
432ms total JS execution
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-N7S...: 111ms CPU time
Info::
https://www.greenpeace.org/global/: 77ms CPU time
Info::
Unattributable: 75ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-99CS...: 58ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-94MR...: 55ms CPU time
Warning::
Third-party scripts: 355ms (82% of total)

Main Thread Breakdown

Script Evaluation 56% Other 18% Script Parsing & Compilation 11% Style & Layout 11%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-N7SG829111ms96ms13ms3rd
https://www.greenpeace.org/global/77ms5ms0ms1st
Unattributable75ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-99CSX66YC1&cx=c&gtm=4e646058ms47ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-94MRTN8HG4&cx=c&gtm=4e646055ms41ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0CCB1GTVV6&cx=c&gtm=4e646055ms44ms11ms3rd
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 500 ms 1.0 s FCP 444 ms LCP 823 mshttps://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+
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
82% of JavaScript execution is third-party
First-party Third-party 355ms · 644KB · €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 111ms
Transfer 164 KB
Unused 37%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 75ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 170 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 55ms
Transfer 156 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 55ms
Transfer 154 KB
Unused 40%
Monthly Cost €1/mo

82% 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

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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