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https://unfccc.int

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
94
GRADE
A
FIX
2
REVIEW
1
PASS
12
INFO
2

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

Mobile Desktop
0
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
45
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

0 ms

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

0 ms

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

0 ms

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.

0 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.

0 ms

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
17
12 PASS 1 REVIEW 2 FIX
D
Third-Party Impact
Action
95% third-party, 0 ms blocking
FIX
95% third-party, 0 ms blocking
Warning::
Third-party code accounts for 95% of page weight (634.0 KiB of 665.0 KiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
665 KB transferred, 16 requests
PASS
665 KB transferred, 16 requests
Info::
Page weighs 2.4 MB (665 KB transferred)
Info::
16 HTTP requests
Info::
Estimated 0.14 g CO2 per page load
665 KB / 2.4 MB budget
665 KB transferred
16 requests
0.14 g CO2 per page load
JavaScript 483.9 KiB 73%
HTML 174.1 KiB 26%
Other 4.0 KiB 1%
Other 1.7 KiB 0%
Other 1.1 KiB 0%
Images 168 B 0%
0 2.4 MB 4.9 MB
Under budget
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 0 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
427ms total JS execution
PASS
427ms total JS execution
Info::
https://js.hcaptcha.com/1/api.js: 232ms CPU time
Info::
Unattributable: 121ms CPU time
Info::
https://unfccc.int/_Incapsula_Resource?SWJIYLWA=71...: 74ms CPU time
Warning::
Third-party scripts: 354ms (83% of total)

Main Thread Breakdown

Script Evaluation 39% Other 34% Style & Layout 14% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://js.hcaptcha.com/1/api.js232ms114ms25ms3rd
Unattributable121ms5ms0ms3rd
https://unfccc.int/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f374ms62ms11ms1st
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
3 scripts, 0 KB unused
PASS
3 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://unfccc.int/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f320 KB—✓1st
https://js.hcaptcha.com/1/api.js86 KB—✓3rd
https://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.js378 KB—✓3rd
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
Page Weight Inventory
16 resources · 665 KB · 0 KB savings available
PASS
16 resources · 665 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 665 KB
Warning::
11 third-party resources (95% of weight)
Info::
1 resources over 200KB
16 resources · 665.0 KiB · 11 third-party Within 1MB page-weight target
JavaScript 73% · 483.9 KiB
Document 26% · 174.1 KiB
Image 1% · 5.9 KiB
Other 0% · 1.1 KiB
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
Network Waterfall
16 requests over 953ms
INFO
0 ms 500 ms 1.0 shttps://unfccc.int// https://unfccc.int/ — 200 — 1.5 KiB — 102 ms — http/1.1https://unfccc.int/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3/_Incapsula_Resource?SWJIYLWA=719d3... https://unfccc.int/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3 — 200 — 19.9 KiB — 66 ms — http/1.1https://unfccc.int/_Incapsula_Resource?SWKMTFSR=1&e=0.03554115588041662/_Incapsula_Resource?SWKMTFSR=1&e=0... https://unfccc.int/_Incapsula_Resource?SWKMTFSR=1&e=0.03554115588041662 — 200 — 168 B — 32 ms — http/1.1https://unfccc.int/_Incapsula_Resource?SWUDNSAI=31&xinfo=13-36274130-0%202cNN%20RT%281776801266469%2034%29%20q%280%20-1%20-1%20-1%29%20r%280%20-1%29%20B12%284%2c315%2c0%29&incident_id=763000510076573768-160641603805580493&edet=12&cinfo=04000000&rpinfo=0&cts=TX2FD7I6HzFon9%2bN4VNjGN%2bRuxRhNtQfS49ysWgHqvIb%2bLL1cViWDMVMRMIKZM7Y&cip=141.227.188.123&mth=GET/_Incapsula_Resource?SWUDNSAI=31&xi... https://unfccc.int/_Incapsula_Resource?SWUDNSAI=31&xinfo=13-36274130-0%202cNN%20RT%281776801266469%2034%29%20q%280%20-1%20-1%20-1%29%20r%280%20-1%29%20B12%284%2c315%2c0%29&incident_id=763000510076573768-160641603805580493&edet=12&cinfo=04000000&rpinfo=0&cts=TX2FD7I6HzFon9%2bN4VNjGN%2bRuxRhNtQfS49ysWgHqvIb%2bLL1cViWDMVMRMIKZM7Y&cip=141.227.188.123&mth=GET — 200 — 7.7 KiB — 63 ms — http/1.1https://js.hcaptcha.com/1/api.jsjs.hcaptcha.com/1/api.js https://js.hcaptcha.com/1/api.js — 200 — 86.0 KiB — 134 ms — h3data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGUAAAAeCAYAAAA1mdDNAAAAAXNSR0IArs4c6QAACh5JREFUaAXtW…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGUAAAAeCAYAAAA1mdDNAAAAAXNSR0IArs4c6QAACh5JREFUaAXtW… — 200 — 0 B — 0 ms — datahttps://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.htmlnewassets.hcaptcha.com/captcha/v1/7... https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.html — 200 — 164.9 KiB — 154 ms — h3https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.htmlnewassets.hcaptcha.com/captcha/v1/7... https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.html — 200 — 0 B — 151 ms — h3https://46bb5e521f3c.w.hcaptcha.com/logo.png46bb5e521f3c.w.hcaptcha.com/logo.pn... https://46bb5e521f3c.w.hcaptcha.com/logo.png — 200 — 2.0 KiB — 99 ms — http/1.1data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+…data:image/gif;base64,R0lGODlhyADIA... data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+… — 200 — 0 B — 1 ms — datadata:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+…data:image/gif;base64,R0lGODlhyADIA... data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+… — 200 — 0 B — 1 ms — datahttps://0b47829b449f.w.hcaptcha.com/logo.png0b47829b449f.w.hcaptcha.com/logo.pn... https://0b47829b449f.w.hcaptcha.com/logo.png — 200 — 2.0 KiB — 93 ms — http/1.1data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABmJLR0QA/wD/AP+gvaeTAAAC00lEQ…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABmJLR0QA/wD/AP+gvaeTAAAC00lEQ… — 200 — 0 B — 0 ms — datahttps://api.hcaptcha.com/checksiteconfig?v=7d7b8b396198c8eb285d18bbc376e49a41bb440a&host=unfccc.int&sitekey=dd6e16a7-972e-47d2-93d0-96642fb6d8de&sc=1&swa=1&spst=1api.hcaptcha.com/checksiteconfig?v=... https://api.hcaptcha.com/checksiteconfig?v=7d7b8b396198c8eb285d18bbc376e49a41bb440a&host=unfccc.int&sitekey=dd6e16a7-972e-47d2-93d0-96642fb6d8de&sc=1&swa=1&spst=1 — 200 — 1.1 KiB — 63 ms — h3https://unfccc.int/favicon.ico/favicon.ico https://unfccc.int/favicon.ico — 200 — 1.7 KiB — 36 ms — http/1.1https://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.jsnewassets.hcaptcha.com/c/d48c491644... https://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.js — 200 — 378.0 KiB — 63 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
83% of JavaScript execution is third-party
First-party Third-party 354ms · 86KB · $5/mo
js.hcaptcha.com
Other
Costly
Execution 232ms
Transfer 86 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 121ms
Transfer 0 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • js.hcaptcha.com adds 232ms and costs ~$3/month

83% 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

js.hcaptcha.com takes 232ms 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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