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.
3.57 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
18.09 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.45 s
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.
5.96 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.
19.11 s
Page Load Progression
383 ms
766 ms
1.1 s
1.5 s 1.9 s
2.3 s
2.7 s
3.1 sFPage Weight BudgetAction2.7 MB transferred, 143 requestsFIX
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
FJS Execution CostAction6775ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.06565108064280decbda.js | 2810ms | 2535ms | 138ms | 3rd |
| Unattributable | 879ms | 21ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer | 817ms | 733ms | 74ms | 3rd |
| https://www.coursera.org/ | 814ms | 69ms | 28ms | 3rd |
| https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.14.27e487db002ff9d5acc5.js | 631ms | 512ms | 110ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js | 246ms | 161ms | 34ms | 3rd |
| https://browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js | 174ms | 100ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11173242093&cx=c>m=4e64e1 | 141ms | 108ms | 33ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-927621030&cx=c>m=4e64e1 | 117ms | 85ms | 31ms | 3rd |
| https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/13.80f8f2acf86dc720779c.js | 75ms | 2ms | 72ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction26 scripts, 803 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.06565108064280decbda.js | 429 KB | 156 KB (37%) | ✓ | 3rd |
| https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.14.27e487db002ff9d5acc5.js | 287 KB | 117 KB (41%) | ✓ | 3rd |
| https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/13.80f8f2acf86dc720779c.js | 234 KB | 114 KB (50%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 72 KB (76%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer | 228 KB | 70 KB (31%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-927621030&cx=c>m=4e64e1 | 139 KB | 68 KB (49%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js | 121 KB | 63 KB (52%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11173242093&cx=c>m=4e64e1 | 139 KB | 63 KB (45%) | ✓ | 3rd |
| https://browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js | 110 KB | 60 KB (55%) | ✓ | 3rd |
| https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/5.0ef11e1f293b9100f560.js | 23 KB | 20 KB (92%) | ✓ | 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 InventoryAction143 resources · 2.7 MB · 803 KB savings availableFIX
~803.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 143 resources | 2.7 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
private, no-cache, no-store, must-revalidate, max-age=0
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| must-revalidate | — | Must recheck with server after expiry |
| max-age | 0 | Cache for 0 seconds |
CImage OptimizationAction77 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
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
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 Loading1 fonts (29 KB)PASS
Web fonts
1
29 KB total
Render-blocking
0
of 1
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 Hints7 hints, 0 missing preconnectsPASS
Current Resource Hints
7 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall143 requests over 6156msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
d3njjcbhbojbot.cloudfront.net d3njjcbhbojbot.cloudfront.net | Other | 2810ms | 429 KB | 37% | €45/mo | Costly |
Unattributable Unattributable | Other | 879ms | 0 KB | — | €14/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 817ms | 228 KB | 31% | €13/mo | Costly |
www.coursera.org www.coursera.org | Other | 814ms | 104 KB | — | €13/mo | Costly |
d3njjcbhbojbot.cloudfront.net d3njjcbhbojbot.cloudfront.net | Other | 631ms | 287 KB | 41% | €10/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 246ms | 121 KB | 52% | €4/mo | Essential |
browser.sentry-cdn.com browser.sentry-cdn.com | Other | 174ms | 110 KB | 55% | €3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 141ms | 139 KB | 45% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 117ms | 139 KB | 49% | €2/mo | Optional |
d3njjcbhbojbot.cloudfront.net d3njjcbhbojbot.cloudfront.net | Other | 75ms | 234 KB | 50% | €1/mo | Optional |
accounts.google.com accounts.google.com | Other | 71ms | 96 KB | 76% | €1/mo | Optional |
These scripts may cost more than they're worth
- d3njjcbhbojbot.cloudfront.net adds 2810ms and costs ~€45/month
- Unattributable adds 879ms and costs ~€14/month
- Google Tag Manager adds 817ms and costs ~€13/month
- www.coursera.org adds 814ms and costs ~€13/month
- d3njjcbhbojbot.cloudfront.net adds 631ms and costs ~€10/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
d3njjcbhbojbot.cloudfront.net takes 2810ms 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 879ms 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 817ms 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.coursera.org takes 814ms 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
d3njjcbhbojbot.cloudfront.net takes 631ms 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 OneTrust'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
55% of browser.sentry-cdn.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
76% of accounts.google.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