Performance
· 22 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.
1.20 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.48 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
246 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.150
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.50 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.
5.65 s
Page Load Progression
732 ms
1.5 s 2.2 s
2.9 s
3.7 s
4.4 s
5.1 s
5.9 sFPage Weight BudgetAction5.1 MB transferred, 283 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
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
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 CostAction5108ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.eurobet.it/it/ | 1068ms | 19ms | 4ms | 3rd |
| Unattributable | 943ms | 51ms | 0ms | 1st |
| https://www.eurobet.it/etc.clientlibs/aem-site-online-common/clientlibs/clientlib-dependencies.min.9c39912770855179b92c0298c9570848.js | 803ms | 616ms | 21ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/w_Yb7dGGXaKesJ7BMiqFJqBG/recaptcha__en.js | 568ms | 512ms | 30ms | 3rd |
| https://js-cdn.dynatrace.com/jstag/16827775e4e/bf75281ymd/358558c0ffaa2e13_complete.js | 328ms | 276ms | 20ms | 3rd |
| https://assets.adobedtm.com/253adb2af6c7/391c5bc6790d/launch-43b8c352a9ec.min.js | 205ms | 146ms | 23ms | 3rd |
| https://www.eurobet.it/etc.clientlibs/aem-site-online-gaming/clientlibs/clientlib-site.min.55d6d456369d05b15c59915516a3a97a.js | 194ms | 91ms | 29ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PPD7WRH | 181ms | 153ms | 19ms | 3rd |
| https://www.eurobet.it/etc.clientlibs/aem-site-online-common/clientlibs/clientlib-site.min.f5ad0d0974840bbb010d11e47f1f1cb7.js | 173ms | 119ms | 20ms | 3rd |
| https://edge.eu1.fullstory.com/s/fs.js | 153ms | 129ms | 12ms | 3rd |
Showing top 10 of 15 scripts
FJS BundlesAction99 scripts, 1.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/w_Yb7dGGXaKesJ7BMiqFJqBG/recaptcha__en.js | 0 KB | 170 KB (51%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/w_Yb7dGGXaKesJ7BMiqFJqBG/recaptcha__en.js | 333 KB | 170 KB (51%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/w_Yb7dGGXaKesJ7BMiqFJqBG/recaptcha__en.js | 332 KB | 170 KB (51%) | ✓ | 3rd |
| https://www.eurobet.it/etc.clientlibs/aem-site-online-gaming/clientlibs/clientlib-site.min.55d6d456369d05b15c59915516a3a97a.js | 169 KB | 139 KB (83%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-9932884&cx=c>m=4e6841 | 135 KB | 102 KB (75%) | ✓ | 3rd |
| https://www.eurobet.it/etc.clientlibs/aem-site-online-gaming/clientlibs/clientlib-dependencies.min.aceeeaeb2bc446ea06e879f1061e1545.js | 101 KB | 91 KB (90%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PPD7WRH | 161 KB | 71 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-9932884 | 135 KB | 61 KB (46%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202403.2.0/otBannerSdk.js | 109 KB | 57 KB (52%) | ✓ | 3rd |
| https://edge.eu1.fullstory.com/s/fs.js | 79 KB | 50 KB (64%) | ✓ | 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 InventoryAction283 resources · 5.1 MB · 1.3 MB savings availableFIX
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 283 resources | 5.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction124 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
CCompression AlgorithmActionMain response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (141 KB)PASS
Web fonts
5
141 KB total
Render-blocking
0
of 5
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
- 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 ~32 KB and ~64 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) 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 Waterfall283 requests over 10092msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.eurobet.it www.eurobet.it | Other | 1068ms | 24 KB | — | €12/mo | Costly |
www.eurobet.it www.eurobet.it | Other | 803ms | 114 KB | 36% | €9/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 568ms | 0 KB | 51% | €6/mo | Costly |
js-cdn.dynatrace.com js-cdn.dynatrace.com | Other | 328ms | 138 KB | 36% | €4/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 205ms | 80 KB | — | €2/mo | Costly |
www.eurobet.it www.eurobet.it | Other | 194ms | 169 KB | 83% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 181ms | 161 KB | 44% | €2/mo | Optional |
www.eurobet.it www.eurobet.it | Other | 173ms | 88 KB | 56% | €2/mo | Optional |
edge.eu1.fullstory.com edge.eu1.fullstory.com | Other | 153ms | 79 KB | 64% | €2/mo | Optional |
www.eurobet.it www.eurobet.it | Other | 143ms | 0 KB | — | €2/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 106ms | 109 KB | 52% | €1/mo | Essential |
www.eurobet.it www.eurobet.it | Other | 95ms | 103 KB | 38% | €1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 87ms | 9 KB | — | €1/mo | Essential |
www.eurobet.it www.eurobet.it | Other | 63ms | 54 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.eurobet.it adds 1068ms and costs ~€12/month
- www.eurobet.it adds 803ms and costs ~€9/month
- www.gstatic.com adds 568ms and costs ~€6/month
- js-cdn.dynatrace.com adds 328ms and costs ~€4/month
- assets.adobedtm.com adds 205ms and costs ~€2/month
82% 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.eurobet.it takes 1068ms 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.eurobet.it takes 803ms 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.gstatic.com takes 568ms 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 www.gstatic.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
js-cdn.dynatrace.com takes 328ms 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
assets.adobedtm.com takes 205ms 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
83% of www.eurobet.it'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 www.eurobet.it'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
64% of edge.eu1.fullstory.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
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
Image Optimization1 images, 0 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
1
Total Size
0 KB