Performance
· 15 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.
1.27 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.63 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
20 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.035
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.16 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.
3.09 s
Page Load Progression
DPage Weight BudgetAction2.3 MB transferred, 110 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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction110 resources · 2.3 MB · 281 KB savings availableFIX
~281.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 110 resources | 2.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization50 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
BJS Execution Cost738ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 263ms | 8ms | 0ms | 3rd |
| https://www.dnb.com/etc.clientlibs/dnb-marketing-website/clientlibs/clientlib-react.lc-15f1d7110ca56aaf01c0691908dc8310-lc.min.js | 147ms | 129ms | 10ms | 3rd |
| https://www.dnb.com/en-us/ | 141ms | 24ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-J6PG | 86ms | 64ms | 20ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-980469900&cx=c>m=4e64h1 | 52ms | 42ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-999921775&cx=c>m=4e64h1 | 50ms | 42ms | 8ms | 3rd |
CJS BundlesAction26 scripts, 281 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-J6PG | 209 KB | 67 KB (32%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-999921775&cx=c>m=4e64h1 | 145 KB | 65 KB (45%) | ✓ | 3rd |
| https://www.dnb.com/etc.clientlibs/dnb-marketing-website/clientlibs/clientlib-react.lc-15f1d7110ca56aaf01c0691908dc8310-lc.min.js | 155 KB | 65 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-980469900&cx=c>m=4e64h1 | 145 KB | 61 KB (42%) | ✓ | 3rd |
| https://www.dnb.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js | 36 KB | 24 KB (68%) | ✓ | 3rd |
| https://www.dnb.com/etc.clientlibs/dnb-marketing-website/clientlibs/clientlib-react/resources/static/js/400.f425b925.chunk.js | 3 KB | — | ✓ | 3rd |
| https://www.dnb.com/etc.clientlibs/dnb-marketing-website/clientlibs/clientlib-react/resources/static/js/4116.2b70afac.chunk.js | 2 KB | — | ✓ | 3rd |
| https://www.dnb.com/etc.clientlibs/clientlibs/granite/jquery/granite/csrf.lc-652a558c3774088b61b0530c184710d1-lc.min.js | 2 KB | — | ✓ | 3rd |
| https://www.dnb.com/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.lc-0a6aff292f5cc42142779cde92054524-lc.min.js | 1 KB | — | ✓ | 3rd |
| https://www.dnb.com/etc.clientlibs/core/wcm/components/image/v3/image/clientlibs/site.lc-bc8f7a99ab6173df84eb42ac5bbceb76-lc.min.js | 2 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 Loading6 fonts (145 KB)PASS
Web fonts
6
145 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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 ~17 KB and ~34 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall110 requests over 2403msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 263ms | 0 KB | — | €3/mo | Costly |
www.dnb.com www.dnb.com | Other | 147ms | 155 KB | 42% | €2/mo | Optional |
www.dnb.com www.dnb.com | Other | 141ms | 3 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 86ms | 209 KB | 32% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 52ms | 145 KB | 42% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 50ms | 145 KB | 45% | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 263ms and costs ~€3/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
Unattributable takes 263ms 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