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.
3.43 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
22.06 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.91 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.290
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.69 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.
25.11 s
Page Load Progression
FPage Weight BudgetAction4.4 MB transferred, 66 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5535ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://consent.cookiebot.eu/7d59e134-b6a1-4f2a-a8e8-6daf9f628325/cc.js?renew=false&referer=www.unaids.org&dnt=false&init=false | 939ms | 393ms | 60ms | 3rd |
| https://www.unaids.org/sites/default/files/js/js_k-zdQKmk-fmDFSM5oP9b60ExNQzPos_pVSZ-YmPqtZU.js?scope=footer&delta=0&language=en&theme=unaidsv2&include=eJxdyEsKgDAMANELtRa8UAlpSiPaQNLf8QXFjZuBeb0CJxt7AETRxFJj5uX6x9ZEmcyDYuFBPvPZSN1gmhaebnDAeiFakRkvUQq_vwEnmyiq | 863ms | 550ms | 100ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-T7FBEZEXNC&cx=c>m=4e64k0 | 852ms | 761ms | 80ms | 3rd |
| https://www.unaids.org/en | 745ms | 62ms | 6ms | 3rd |
| Unattributable | 606ms | 19ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KKR6R7 | 519ms | 396ms | 81ms | 3rd |
| https://buttons-config.sharethis.com/js/5968b481b69de60011989e3d.js | 308ms | 248ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-801578042&cx=c>m=4e64k0 | 285ms | 203ms | 80ms | 3rd |
| https://consent.cookiebot.eu/uc.js?cbid=7d59e134-b6a1-4f2a-a8e8-6daf9f628325&implementation=gtm&consentmode-dataredaction=dynamic | 191ms | 157ms | 25ms | 3rd |
| https://platform-api.sharethis.com/js/sharethis.js | 140ms | 57ms | 34ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction14 scripts, 663 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.unaids.org/sites/default/files/js/js_k-zdQKmk-fmDFSM5oP9b60ExNQzPos_pVSZ-YmPqtZU.js?scope=footer&delta=0&language=en&theme=unaidsv2&include=eJxdyEsKgDAMANELtRa8UAlpSiPaQNLf8QXFjZuBeb0CJxt7AETRxFJj5uX6x9ZEmcyDYuFBPvPZSN1gmhaebnDAeiFakRkvUQq_vwEnmyiq | 619 KB | 431 KB (70%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-T7FBEZEXNC&cx=c>m=4e64k0 | 171 KB | 66 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KKR6R7 | 166 KB | 64 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-801578042&cx=c>m=4e64k0 | 137 KB | 55 KB (40%) | ✓ | 3rd |
| https://customer.cludo.com/scripts/bundles/search-script.min.js | 51 KB | 26 KB (52%) | ✓ | 3rd |
| https://platform-api.sharethis.com/js/sharethis.js | 47 KB | 22 KB (48%) | ✗ | 3rd |
| https://consent.cookiebot.eu/uc.js?cbid=7d59e134-b6a1-4f2a-a8e8-6daf9f628325&implementation=gtm&consentmode-dataredaction=dynamic | 30 KB | — | ✓ | 3rd |
| https://www.youtube.com/player_api | 4 KB | — | ✓ | 3rd |
| https://buttons-config.sharethis.com/js/5968b481b69de60011989e3d.js | 1 KB | — | ✓ | 3rd |
| https://www.google-analytics.com/analytics.js | 21 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
FPage Weight InventoryAction66 resources · 4.4 MB · 663 KB savings availableFIX
~662.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 66 resources | 4.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction28 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (149 KB)PASS
Web fonts
5
149 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 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
Network Waterfall66 requests over 3707msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
consent.cookiebot.eu consent.cookiebot.eu | Other | 939ms | 87 KB | — | CHF14/mo | Costly |
www.unaids.org www.unaids.org | Other | 863ms | 619 KB | 70% | CHF13/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 852ms | 171 KB | 38% | CHF13/mo | Costly |
www.unaids.org www.unaids.org | Other | 745ms | 16 KB | — | CHF11/mo | Costly |
Unattributable Unattributable | Other | 606ms | 0 KB | — | CHF9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 519ms | 166 KB | 39% | CHF8/mo | Costly |
buttons-config.sharethis.com buttons-config.sharethis.com | Other | 308ms | 1 KB | — | CHF5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 285ms | 137 KB | 40% | CHF4/mo | Costly |
consent.cookiebot.eu consent.cookiebot.eu | Other | 191ms | 30 KB | — | CHF3/mo | Optional |
platform-api.sharethis.com platform-api.sharethis.com | Other | 140ms | 47 KB | 48% | CHF2/mo | Optional |
customer.cludo.com customer.cludo.com | Other | 86ms | 51 KB | 52% | CHF1/mo | Optional |
These scripts may cost more than they're worth
- consent.cookiebot.eu adds 939ms and costs ~CHF14/month
- www.unaids.org adds 863ms and costs ~CHF13/month
- Google Tag Manager adds 852ms and costs ~CHF13/month
- www.unaids.org adds 745ms and costs ~CHF11/month
- Unattributable adds 606ms and costs ~CHF9/month
- Google Tag Manager adds 519ms and costs ~CHF8/month
- buttons-config.sharethis.com adds 308ms and costs ~CHF5/month
- Google Tag Manager adds 285ms and costs ~CHF4/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
consent.cookiebot.eu takes 939ms 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.unaids.org takes 863ms 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
70% of www.unaids.org'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
Google Tag Manager takes 852ms 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.unaids.org takes 745ms 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 606ms 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 519ms 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
buttons-config.sharethis.com takes 308ms 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 285ms 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 customer.cludo.com'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