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.
6.49 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.93 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
230 ms
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.
6.77 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.
8.96 s
Page Load Progression
614 ms 1.2 s 1.8 s 2.5 s
3.1 s
3.7 s
4.3 s
4.9 sFPage Weight BudgetAction4.2 MB transferred, 75 requestsFIX
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2626ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.visa.es/ | 757ms | 10ms | 1ms | 3rd |
| Unattributable | 412ms | 37ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-16736624984 | 337ms | 305ms | 28ms | 3rd |
| https://policy.cookiereports.com/439c3d1f_panel-es.js | 301ms | 190ms | 13ms | 3rd |
| https://www.visa.es/etc.clientlibs/cms-rest/clientlibs/cms-jquery.min.js | 294ms | 156ms | 30ms | 3rd |
| https://tags.tiqcdn.com/utag/visa/visa-com-europe/prod/utag.js | 248ms | 104ms | 26ms | 3rd |
| https://cdn.visa.com/cdn/scripts/components/3.7.5/navigation.js | 168ms | 107ms | 10ms | 3rd |
| https://www.visa.es/etc/ui/headless-ui/scripts/core/stencil-components/promotion-offer/p-c97cd60b.js | 109ms | 30ms | 0ms | 3rd |
DPage Weight InventoryAction75 resources · 4.2 MB · 135 KB savings availableFIX
~135.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 75 resources | 4.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction16 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
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
BJS Bundles32 scripts, 135 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.visa.es/etc.clientlibs/cms-rest/clientlibs/cms-jquery.min.js | 110 KB | 83 KB (76%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-16736624984 | 146 KB | 52 KB (36%) | ✓ | 3rd |
| https://www.visa.es/etc.clientlibs/cms-rest/components/core/brand-blade-container/v1/brand-blade-container/clientlibs.min.js | 4 KB | — | ✓ | 3rd |
| https://www.visa.es/etc/ui/headless-ui/scripts/core/stencil-components/promotion-offer/p-f6595185.js | 1 KB | — | ✓ | 3rd |
| https://www.visa.es/etc.clientlibs/cms-rest/clientlibs/modal.min.js | 4 KB | — | ✓ | 3rd |
| https://www.visa.es/etc.clientlibs/cms-rest/clientlibs/throttle-plugin.min.js | 0 KB | — | ✓ | 3rd |
| https://www.visa.es/etc.clientlibs/cms-rest/clientlibs/inview-plugin.min.js | 0 KB | — | ✓ | 3rd |
| https://www.visa.es/etc.clientlibs/cms-rest/clientlibs/lazyloading-plugin.min.js | 1 KB | — | ✓ | 3rd |
| https://www.visa.es/etc.clientlibs/cms-rest/clientlibs/clientlib-accessibility.min.js | 0 KB | — | ✓ | 3rd |
| https://www.visa.es/etc.clientlibs/cms-rest/clientlibs/tealium.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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (158 KB)PASS
Web fonts
4
158 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~23 KB and ~46 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 Waterfall75 requests over 1858msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.visa.es www.visa.es | Other | 757ms | 8 KB | — | €12/mo | Costly |
Unattributable Unattributable | Other | 412ms | 0 KB | — | €7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 337ms | 146 KB | 36% | €5/mo | Costly |
policy.cookiereports.com policy.cookiereports.com | Other | 301ms | 27 KB | — | €5/mo | Costly |
www.visa.es www.visa.es | Other | 294ms | 110 KB | 76% | €5/mo | Costly |
tags.tiqcdn.com tags.tiqcdn.com | Other | 248ms | 45 KB | — | €4/mo | Costly |
cdn.visa.com cdn.visa.com | Other | 168ms | 28 KB | — | €3/mo | Optional |
www.visa.es www.visa.es | Other | 109ms | 6 KB | — | €2/mo | Optional |
These scripts may cost more than they're worth
- www.visa.es adds 757ms and costs ~€12/month
- Unattributable adds 412ms and costs ~€7/month
- Google Tag Manager adds 337ms and costs ~€5/month
- policy.cookiereports.com adds 301ms and costs ~€5/month
- www.visa.es adds 294ms and costs ~€5/month
- tags.tiqcdn.com adds 248ms and costs ~€4/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
www.visa.es takes 757ms 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 412ms 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 337ms 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
policy.cookiereports.com takes 301ms 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.visa.es takes 294ms 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
76% of www.visa.es'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
tags.tiqcdn.com takes 248ms 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