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.
3.33 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.59 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
851 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.096
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.47 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.
11.56 s
Page Load Progression
DPage Weight BudgetAction2.5 MB transferred, 114 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
DJS Execution CostAction3457ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1021ms | 31ms | 0ms | 3rd |
| https://www.dnb.com/etc.clientlibs/dnb-marketing-website/clientlibs/clientlib-react.lc-15f1d7110ca56aaf01c0691908dc8310-lc.min.js | 567ms | 495ms | 43ms | 3rd |
| https://www.dnb.com/en-us/ | 504ms | 73ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-J6PG | 381ms | 305ms | 69ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-980469900&cx=c>m=4e64h1 | 243ms | 206ms | 36ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-999933232&cx=c>m=4e64h1 | 206ms | 131ms | 35ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-999921775&cx=c>m=4e64h1 | 200ms | 167ms | 32ms | 3rd |
| https://consent.trustarc.com/v2/notice/tlglke | 162ms | 86ms | 18ms | 3rd |
| https://www.dnb.com/etc.clientlibs/dnb-marketing-website/clientlibs/clientlib-react/resources/static/js/5239.17c7aa90.chunk.js | 61ms | 59ms | 1ms | 3rd |
| https://www.dnb.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js | 58ms | 38ms | 8ms | 3rd |
Showing top 10 of 11 scripts
DJS BundlesAction27 scripts, 345 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/destination?id=AW-999933232&cx=c>m=4e64h1 | 134 KB | 69 KB (51%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-J6PG | 209 KB | 65 KB (31%) | ✓ | 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-999921775&cx=c>m=4e64h1 | 145 KB | 62 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-980469900&cx=c>m=4e64h1 | 145 KB | 60 KB (41%) | ✓ | 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/8807.863144c2.chunk.js | 4 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 |
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
DPage Weight InventoryAction114 resources · 2.5 MB · 345 KB savings availableFIX
~344.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 114 resources | 2.5 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization52 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
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 Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
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 Waterfall114 requests over 1976msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1021ms | 0 KB | — | €11/mo | Costly |
www.dnb.com www.dnb.com | Other | 567ms | 155 KB | 42% | €6/mo | Costly |
www.dnb.com www.dnb.com | Other | 504ms | 2 KB | — | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 381ms | 209 KB | 31% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 243ms | 145 KB | 41% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 206ms | 134 KB | 51% | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 200ms | 145 KB | 43% | €2/mo | Optional |
consent.trustarc.com consent.trustarc.com | Other | 162ms | 36 KB | — | €2/mo | Optional |
www.dnb.com www.dnb.com | Other | 61ms | 9 KB | — | €1/mo | Optional |
www.dnb.com www.dnb.com | Other | 58ms | 36 KB | 68% | €1/mo | Optional |
www.dnb.com www.dnb.com | Other | 54ms | 2 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1021ms and costs ~€11/month
- www.dnb.com adds 567ms and costs ~€6/month
- www.dnb.com adds 504ms and costs ~€5/month
- Google Tag Manager adds 381ms and costs ~€4/month
- Google Tag Manager adds 243ms and costs ~€3/month
- Google Tag Manager adds 206ms 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
Unattributable takes 1021ms 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.dnb.com takes 567ms 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.dnb.com takes 504ms 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 381ms 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 243ms 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 206ms 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
51% 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
68% of www.dnb.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