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.
5.20 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.81 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
236 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.70 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.
10.88 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction36 resources · 1.5 MB · 257 KB savings availableFIX
~257.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 36 resources | 1.5 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.5 MB transferred, 36 requestsREVIEW
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
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
CImage OptimizationAction11 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS Execution CostAction1715ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.icc-cpi.int/ | 414ms | 31ms | 5ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HWB32LNHJM | 282ms | 202ms | 48ms | 3rd |
| https://www.icc-cpi.int/cdn-cgi/challenge-platform/scripts/jsd/main.js | 275ms | 225ms | 2ms | 3rd |
| Unattributable | 218ms | 5ms | 0ms | 3rd |
| https://www.icc-cpi.int/sites/default/files/js/js_U-DRYAWoXi_v6kdIeD-rikdtKlrg_Dfr9_IRYn3zbNE.js?scope=footer&delta=4&language=en&theme=icccpi&include=eJx1juFuwyAMhF8IhjRtD7GnQIY4lMjBDJtEefutq2inqP3nu-_ku8Csog3qpwv30y5iCRRFzdyJIhCWCZrfMu7uv_MEUw4NWkZ5W2RusKJJzInQQwE6NEdxZ8PkGGPNjwEfNvJaQQeI3Jva0WNxw3JniTgA_S4exsFde0BbufZqREG7-BVFIKG4m7ZDm-tm8UJ5Qrnw7pbvju3wF96wfRW9Fp0je54Sqs9l5jPz8YiE48mfeBURLu8v2FP3BzAFqKM | 186ms | 123ms | 20ms | 3rd |
| https://www.icc-cpi.int/sites/default/files/js/js_66T98GlsN_j4sB0R4Dc5HBbw7HbxY7RPrg4MChtDSss.js?scope=footer&delta=2&language=en&theme=icccpi&include=eJx1juFuwyAMhF8IhjRtD7GnQIY4lMjBDJtEefutq2inqP3nu-_ku8Csog3qpwv30y5iCRRFzdyJIhCWCZrfMu7uv_MEUw4NWkZ5W2RusKJJzInQQwE6NEdxZ8PkGGPNjwEfNvJaQQeI3Jva0WNxw3JniTgA_S4exsFde0BbufZqREG7-BVFIKG4m7ZDm-tm8UJ5Qrnw7pbvju3wF96wfRW9Fp0je54Sqs9l5jPz8YiE48mfeBURLu8v2FP3BzAFqKM | 158ms | 88ms | 28ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-202525917-1&cx=c>m=4e64k1 | 108ms | 79ms | 27ms | 3rd |
| https://www.icc-cpi.int/sites/default/files/css/css_0OxJVdMGttrMn96q4o5CLR7MW6gCLnAQ6cj-wdvwtSc.css?delta=1&language=en&theme=icccpi&include=eJxtj1sOwkAIRTfUdr5cz4SZwYphSgNUrau3Wt_6Q3LPTeCQRNxcYdyEBIZNeuWeJQG35jPT0L83Fc2gR2uyKIai0wjcwR5OH6AQsPQrGkQrMJ2x2U7MGRiHAhoPhMfAlBSU0Lr3rvUdVmwo5zzSt4s5-GTx4RHW3D69bDbHun50vWHhNrsqZeI7isZU0HZyDFkGV2GLjif_acdlpca0uKHbdxvznBnDX3oBZj6JUA | 75ms | 0ms | 0ms | 3rd |
CJS BundlesAction11 scripts, 257 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.icc-cpi.int/sites/default/files/js/js_66T98GlsN_j4sB0R4Dc5HBbw7HbxY7RPrg4MChtDSss.js?scope=footer&delta=2&language=en&theme=icccpi&include=eJx1juFuwyAMhF8IhjRtD7GnQIY4lMjBDJtEefutq2inqP3nu-_ku8Csog3qpwv30y5iCRRFzdyJIhCWCZrfMu7uv_MEUw4NWkZ5W2RusKJJzInQQwE6NEdxZ8PkGGPNjwEfNvJaQQeI3Jva0WNxw3JniTgA_S4exsFde0BbufZqREG7-BVFIKG4m7ZDm-tm8UJ5Qrnw7pbvju3wF96wfRW9Fp0je54Sqs9l5jPz8YiE48mfeBURLu8v2FP3BzAFqKM | 90 KB | 70 KB (78%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-202525917-1&cx=c>m=4e64k1 | 116 KB | 65 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HWB32LNHJM | 157 KB | 65 KB (41%) | ✓ | 3rd |
| https://www.icc-cpi.int/sites/default/files/js/js_U-DRYAWoXi_v6kdIeD-rikdtKlrg_Dfr9_IRYn3zbNE.js?scope=footer&delta=4&language=en&theme=icccpi&include=eJx1juFuwyAMhF8IhjRtD7GnQIY4lMjBDJtEefutq2inqP3nu-_ku8Csog3qpwv30y5iCRRFzdyJIhCWCZrfMu7uv_MEUw4NWkZ5W2RusKJJzInQQwE6NEdxZ8PkGGPNjwEfNvJaQQeI3Jva0WNxw3JniTgA_S4exsFde0BbufZqREG7-BVFIKG4m7ZDm-tm8UJ5Qrnw7pbvju3wF96wfRW9Fp0je54Sqs9l5jPz8YiE48mfeBURLu8v2FP3BzAFqKM | 70 KB | 36 KB (52%) | ✓ | 3rd |
| https://www.icc-cpi.int/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1 | 28 KB | 22 KB (79%) | ✓ | 3rd |
| https://code.jquery.com/jquery-3.6.4.min.js | 31 KB | — | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/rrule@2.6.8/dist/es5/rrule.min.js | 15 KB | — | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/jsframe.js@1.5.16/lib/jsframe.min.js | 20 KB | — | ✓ | 3rd |
| https://www.icc-cpi.int/sites/default/files/js/js_9wGPgMUFy7dSbVyhAg7kHofcH8E1KBXNEEHCUo0jnb8.js?scope=footer&delta=6&language=en&theme=icccpi&include=eJx1juFuwyAMhF8IhjRtD7GnQIY4lMjBDJtEefutq2inqP3nu-_ku8Csog3qpwv30y5iCRRFzdyJIhCWCZrfMu7uv_MEUw4NWkZ5W2RusKJJzInQQwE6NEdxZ8PkGGPNjwEfNvJaQQeI3Jva0WNxw3JniTgA_S4exsFde0BbufZqREG7-BVFIKG4m7ZDm-tm8UJ5Qrnw7pbvju3wF96wfRW9Fp0je54Sqs9l5jPz8YiE48mfeBURLu8v2FP3BzAFqKM | 18 KB | — | ✓ | 3rd |
| https://www.icc-cpi.int/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? | 12 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (429 KB)PASS
Web fonts
5
429 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
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- 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 ~176 KB and ~352 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
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 Waterfall36 requests over 780msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.icc-cpi.int www.icc-cpi.int | Other | 414ms | 19 KB | — | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 282ms | 157 KB | 41% | €3/mo | Costly |
www.icc-cpi.int www.icc-cpi.int | Other | 275ms | 0 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 218ms | 0 KB | — | €2/mo | Costly |
www.icc-cpi.int www.icc-cpi.int | Other | 186ms | 70 KB | 52% | €2/mo | Optional |
www.icc-cpi.int www.icc-cpi.int | Other | 158ms | 90 KB | 78% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 108ms | 116 KB | 56% | €1/mo | Optional |
www.icc-cpi.int www.icc-cpi.int | Other | 75ms | 96 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.icc-cpi.int adds 414ms and costs ~€4/month
- Google Tag Manager adds 282ms and costs ~€3/month
- www.icc-cpi.int adds 275ms and costs ~€3/month
- Unattributable adds 218ms and costs ~€2/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.icc-cpi.int takes 414ms 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 282ms 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.icc-cpi.int 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
Unattributable takes 218ms 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
52% of www.icc-cpi.int's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
78% of www.icc-cpi.int's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
56% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev