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.
16.15 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
30.67 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.60 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.058
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
16.15 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.
31.57 s
Page Load Progression
FPage Weight BudgetAction6.0 MB transferred, 172 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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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 CostAction9671ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.fcbarcelona.com/resources/v3.5.4-8282/scripts/vendors.min.js | 2731ms | 166ms | 72ms | 3rd |
| Unattributable | 1057ms | 103ms | 0ms | 3rd |
| https://content.usestoryteller.com/javascript-sdk/10.3.5/dist/storyteller.min.js | 630ms | 422ms | 46ms | 3rd |
| https://www.fcbarcelona.com/en/ | 605ms | 122ms | 22ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TR7BQW | 421ms | 357ms | 59ms | 3rd |
| https://www.fcbarcelona.com/resources/v3.5.4-8282/widgets/common.min.js | 396ms | 75ms | 15ms | 3rd |
| https://assets.adobedtm.com/launch-EN34cf030df5534d6395af8319e4d4561c.min.js | 377ms | 282ms | 75ms | 3rd |
| https://open.http.mp.streamamg.com/p/3000707/sp/300070700/embedIframeJs/uiconf_id/30027660/partner_id/3000707 | 318ms | 254ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-925711413&cx=c>m=4e64m0h2 | 264ms | 214ms | 42ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-724253322&cx=c>m=4e64m0h2 | 264ms | 198ms | 59ms | 3rd |
Showing top 10 of 28 scripts
FJS BundlesAction44 scripts, 1.1 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=DC-14513962&cx=c>m=4e64m0h2 | 148 KB | 109 KB (73%) | ✓ | 3rd |
| https://content.usestoryteller.com/javascript-sdk/10.3.5/dist/storyteller.min.js | 155 KB | 96 KB (62%) | ✓ | 3rd |
| https://assets.adobedtm.com/launch-EN34cf030df5534d6395af8319e4d4561c.min.js | 183 KB | 86 KB (47%) | ✓ | 3rd |
| https://sdk.fek.pulselive.com/fek-sdk-client-web/latest/client.min.js | 215 KB | 71 KB (34%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TR7BQW | 191 KB | 68 KB (36%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1055951110&cx=c>m=4e64m0h2 | 143 KB | 64 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-16454699415&cx=c>m=4e64m0h2 | 136 KB | 64 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-940928634&cx=c>m=4e64m0h2 | 136 KB | 64 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-724253322&cx=c>m=4e64m0h2 | 144 KB | 64 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-16551201008&cx=c>m=4e64m0h2 | 143 KB | 64 KB (44%) | ✓ | 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 InventoryAction172 resources · 6.0 MB · 1.1 MB savings availableFIX
~1.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 172 resources | 6.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction60 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.
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
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 Loading11 fonts (271 KB)PASS
Web fonts
11
271 KB total
Render-blocking
0
of 11
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 Hints12 hints, 0 missing preconnectsPASS
Current Resource Hints
12 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall172 requests over 4189msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.fcbarcelona.com www.fcbarcelona.com | Other | 2731ms | 86 KB | — | €14/mo | Costly |
Unattributable Unattributable | Other | 1057ms | 0 KB | — | €6/mo | Costly |
content.usestoryteller.com content.usestoryteller.com | Other | 630ms | 155 KB | 62% | €3/mo | Costly |
www.fcbarcelona.com www.fcbarcelona.com | Other | 605ms | 54 KB | — | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 421ms | 191 KB | 36% | €2/mo | Costly |
www.fcbarcelona.com www.fcbarcelona.com | Other | 396ms | 42 KB | 49% | €2/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 377ms | 183 KB | 47% | €2/mo | Costly |
open.http.mp.streamamg.com open.http.mp.streamamg.com | Other | 318ms | 0 KB | — | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 264ms | 148 KB | 43% | €1/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 264ms | 144 KB | 44% | €1/mo | Costly |
privacy.fcbcookies.cat privacy.fcbcookies.cat | Other | 212ms | 103 KB | 45% | €1/mo | Costly |
privacy.fcbcookies.cat privacy.fcbcookies.cat | Other | 195ms | 53 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 186ms | 143 KB | 44% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 180ms | 143 KB | 45% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 170ms | 136 KB | 46% | €1/mo | Optional |
www.fcbarcelona.com www.fcbarcelona.com | Other | 169ms | 4 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 162ms | 136 KB | 47% | €1/mo | Optional |
www.fcbarcelona.com www.fcbarcelona.com | Other | 159ms | 50 KB | 45% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 159ms | 140 KB | 46% | €1/mo | Optional |
privacy.fcbcookies.cat privacy.fcbcookies.cat | Other | 156ms | 1 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 150ms | 136 KB | 47% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 138ms | 136 KB | 47% | €1/mo | Optional |
sdk.fek.pulselive.com sdk.fek.pulselive.com | Other | 131ms | 215 KB | 34% | €1/mo | Optional |
open.http.mp.streamamg.com open.http.mp.streamamg.com | Other | 128ms | 0 KB | — | €1/mo | Optional |
code.jquery.com code.jquery.com | Other | 95ms | 30 KB | 67% | €0/mo | Optional |
www.fcbarcelona.com www.fcbarcelona.com | Other | 83ms | 19 KB | — | €0/mo | Optional |
www.fcbarcelona.com www.fcbarcelona.com | Other | 79ms | 152 KB | — | €0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 55ms | 148 KB | 73% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.fcbarcelona.com adds 2731ms and costs ~€14/month
- Unattributable adds 1057ms and costs ~€6/month
- content.usestoryteller.com adds 630ms and costs ~€3/month
- www.fcbarcelona.com adds 605ms and costs ~€3/month
- Google Tag Manager adds 421ms and costs ~€2/month
- www.fcbarcelona.com adds 396ms and costs ~€2/month
- assets.adobedtm.com adds 377ms and costs ~€2/month
- open.http.mp.streamamg.com adds 318ms and costs ~€2/month
- Google Tag Manager adds 264ms and costs ~€1/month
- Google Tag Manager adds 264ms and costs ~€1/month
- privacy.fcbcookies.cat adds 212ms and costs ~€1/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.fcbarcelona.com takes 2731ms 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 1057ms 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
content.usestoryteller.com takes 630ms 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
62% of content.usestoryteller.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
www.fcbarcelona.com takes 605ms 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 421ms 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.fcbarcelona.com takes 396ms 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 377ms 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
open.http.mp.streamamg.com takes 318ms 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 264ms 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 264ms 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
privacy.fcbcookies.cat takes 212ms 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
67% of code.jquery.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
73% 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