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https://mwcbarcelona.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
1
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
24
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.63 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.16 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1.90 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.303

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.21 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.

6.05 s

Page Load Progression

415 ms
830 ms
1.2 s
1.7 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
15
6 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 65 requests
FIX
3.1 MB transferred, 65 requests
Warning::
Page weighs 6.2 MB (3.1 MB transferred)
Info::
Fonts are 1.1 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.1 MB
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
65 HTTP requests
Info::
Estimated 0.64 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
65 requests
0.64 g CO2 per page load
Fonts 1.1 MiB 34%
JavaScript 1.0 MiB 34%
Images 850.2 KiB 27%
CSS 105.6 KiB 3%
HTML 30.7 KiB 1%
Other 10.7 KiB 0%
Other 1.1 KiB 0%
Other 851 B 0%
Other 555 B 0%
Other 340 B 0%
0 2.4 MB 4.9 MB
Over budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3764ms total JS execution
FIX
3764ms total JS execution
Warning::
https://www.mwcbarcelona.com/build/assets/app-BOg1...: 3315ms CPU time
Info::
https://www.mwcbarcelona.com/: 192ms CPU time
Info::
Unattributable: 165ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PC5...: 91ms CPU time
Warning::
Third-party scripts: 3764ms (100% of total)

Main Thread Breakdown

Other 84% Script Evaluation 9% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://www.mwcbarcelona.com/build/assets/app-BOg1kQEw.js3315ms206ms2ms3rd
https://www.mwcbarcelona.com/192ms4ms2ms3rd
Unattributable165ms7ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PC5BHH91ms74ms15ms3rd
F
JS Bundles
Action
14 scripts, 689 KB unused
FIX
14 scripts, 689 KB unused
Warning::
https://www.mwcbarcelona.com/build/assets/app-BOg1...: 409 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.mwcbarcelona.com/build/assets/sendbird...: 102 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PC5...: 77 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.mwcbarcelona.com/build/assets/react-Bc...: 54 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.evgnet.com/beacon/gsmassociation/produ...: 26 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.evgnet.com/beacon/gsmassociation/produ...: unminified — 7 KB could be saved
Info::
Total unused JavaScript: 689 KB
689 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.mwcbarcelona.com/build/assets/app-BOg1kQEw.js537 KB409 KB (76%)✓3rd
https://www.mwcbarcelona.com/build/assets/sendbird-BSGK1Ivk.js120 KB102 KB (85%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PC5BHH185 KB77 KB (42%)✓3rd
https://www.mwcbarcelona.com/build/assets/react-BczY32Hg.js79 KB54 KB (69%)✓3rd
https://cdn.evgnet.com/beacon/gsmassociation/production/scripts/evergage.min.js54 KB26 KB (48%)✗3rd
https://www.mwcbarcelona.com/build/assets/import-wrapper-prod-C_1lQUfT.js32 KB21 KB (66%)✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 KB—✓3rd
https://cdn.cookielaw.org/consent/614650cf-c520-413c-ba77-b1b48b8e63d5/OtAutoBlock.js0 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js11 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
65 resources · 3.1 MB · 689 KB savings available
FIX
65 resources · 3.1 MB · 689 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~689 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
3 resources over 200KB
65 resources · 3.1 MiB · 64 third-party 2.1 MiB over 1MB target
Font 34% · 1.1 MiB
JavaScript 34% · 1.0 MiB
Image 27% · 860.4 KiB
CSS 3% · 105.6 KiB
Document 1% · 30.7 KiB
Other 0% · 3.3 KiB

~688.6 KiB of savings available

Remove unused JavaScript: 688.6 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 849 KB
0 oversized -0 KB
7 legacy format
5 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (1082 KB)
PASS
5 fonts (1082 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

1082 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.6 s LCP 3.2 shttps://static.fonts.gsma.com/s/inter/v20/UcCo3FwrK3iLTcviYwYZ8UA3.woff2UcCo3FwrK3iLTcviYwYZ8UA... https://static.fonts.gsma.com/s/inter/v20/UcCo3FwrK3iLTcviYwYZ8UA3.woff2 — 71.6 KiB — 61 ms — font-display: swaphttps://fa.gsma.com/icons/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://fa.gsma.com/icons/webfonts/fa-regular-400.woff2 — 416.1 KiB — 115 ms — font-display: swaphttps://fa.gsma.com/icons/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://fa.gsma.com/icons/webfonts/fa-solid-900.woff2 — 346.4 KiB — 113 ms — font-display: swaphttps://fa.gsma.com/icons/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://fa.gsma.com/icons/webfonts/fa-brands-400.woff2 — 117.2 KiB — 50 ms — font-display: swaphttps://static.fonts.gsma.com/s/inter/v20/UcCo3FwrK3iLTcvsYwYZ8UA3J58.woff2UcCo3FwrK3iLTcvsYwYZ8UA... https://static.fonts.gsma.com/s/inter/v20/UcCo3FwrK3iLTcvsYwYZ8UA3J58.woff2 — 130.8 KiB — 60 ms — font-display: swap
UcCo3FwrK3iLTcviYwYZ8UA... woff2 swap
Size 72 KB
Load time 61 ms
Start 562 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 416 KB
Load time 115 ms
Start 639 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-solid-900.woff2 woff2 swap
Size 346 KB
Load time 113 ms
Start 640 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.woff2 woff2 swap
Size 117 KB
Load time 50 ms
Start 690 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
UcCo3FwrK3iLTcvsYwYZ8UA... woff2 swap
Size 131 KB
Load time 60 ms
Start 3.4 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~505 KB and ~1010 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
65 requests over 4402ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.6 s LCP 3.2 shttps://mwcbarcelona.com// https://mwcbarcelona.com/ — 308 — 213 B — 42 ms — h3https://www.mwcbarcelona.com/www.mwcbarcelona.com/ https://www.mwcbarcelona.com/ — 200 — 30.7 KiB — 357 ms — h3https://www.mwcbarcelona.com/cdn-cgi/speculationwww.mwcbarcelona.com/cdn-cgi/specul... https://www.mwcbarcelona.com/cdn-cgi/speculation — 200 — 325 B — 22 ms — h3https://www.mwcbarcelona.com/build/assets/css-fu2qJh6n.csswww.mwcbarcelona.com/build/assets/c... https://www.mwcbarcelona.com/build/assets/css-fu2qJh6n.css — 200 — 45.4 KiB — 72 ms — h3https://www.mwcbarcelona.com/build/assets/app-BOg1kQEw.jswww.mwcbarcelona.com/build/assets/a... https://www.mwcbarcelona.com/build/assets/app-BOg1kQEw.js — 200 — 537.1 KiB — 113 ms — h3https://www.mwcbarcelona.com/build/assets/sendbird-BSGK1Ivk.jswww.mwcbarcelona.com/build/assets/s... https://www.mwcbarcelona.com/build/assets/sendbird-BSGK1Ivk.js — 200 — 119.5 KiB — 134 ms — h3https://www.mwcbarcelona.com/build/assets/react-BczY32Hg.jswww.mwcbarcelona.com/build/assets/r... https://www.mwcbarcelona.com/build/assets/react-BczY32Hg.js — 200 — 78.7 KiB — 146 ms — h3https://www.mwcbarcelona.com/build/assets/vendor-hlgBS5Ud.jswww.mwcbarcelona.com/build/assets/v... https://www.mwcbarcelona.com/build/assets/vendor-hlgBS5Ud.js — 200 — 9.7 KiB — 127 ms — h3https://www.mwcbarcelona.com/build/assets/dev-CgdtHzsi.jswww.mwcbarcelona.com/build/assets/d... https://www.mwcbarcelona.com/build/assets/dev-CgdtHzsi.js — 200 — 8.3 KiB — 128 ms — h3https://www.mwcbarcelona.com/build/assets/app-B5ci09SU.csswww.mwcbarcelona.com/build/assets/a... https://www.mwcbarcelona.com/build/assets/app-B5ci09SU.css — 200 — 3.7 KiB — 68 ms — h3https://api.fonts.gsma.com/css2?family=Inter:ital,opsz,wght@0,14..32,300..800;1,14..32,300..800&display=swapapi.fonts.gsma.com/css2?family=Inte... https://api.fonts.gsma.com/css2?family=Inter:ital,opsz,wght@0,14..32,300..800;1,14..32,300..800&display=swap — 200 — 943 B — 123 ms — h2https://fa.gsma.com/icons/css/all.min.cssfa.gsma.com/icons/css/all.min.css https://fa.gsma.com/icons/css/all.min.css — 200 — 55.6 KiB — 59 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Logos/logo-mwc-gsma-300x300-optimised.pngwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Logos/logo-mwc-gsma-300x300-optimised.png — 200 — 4.6 KiB — 141 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Barcelona/mwc_2025_exterior_1_3x2.jpgwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Barcelona/mwc_2025_exterior_1_3x2.jpg — 200 — 71.0 KiB — 146 ms — h3https://cdn.cookielaw.org/consent/614650cf-c520-413c-ba77-b1b48b8e63d5/OtAutoBlock.jscdn.cookielaw.org/consent/614650cf-... https://cdn.cookielaw.org/consent/614650cf-c520-413c-ba77-b1b48b8e63d5/OtAutoBlock.js — -1 — 0 B — 259 ms — https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 259 ms — https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Barcelona/mwcb26_aaron_paul_3x2.webpwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Barcelona/mwcb26_aaron_paul_3x2.webp — 200 — 28.3 KiB — 55 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Barcelona/mwcb26_robot_server_3x2.webpwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Barcelona/mwcb26_robot_server_3x2.webp — 200 — 30.1 KiB — 55 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Logos/logo-4yfn-2024.pngwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Logos/logo-4yfn-2024.png — 200 — 2.0 KiB — 55 ms — h3https://www.mwcbarcelona.com/site.webmanifestwww.mwcbarcelona.com/site.webmanife... https://www.mwcbarcelona.com/site.webmanifest — 200 — 851 B — 63 ms — h3https://www.mwcbarcelona.com/images/skip-link.svgwww.mwcbarcelona.com/images/skip-li... https://www.mwcbarcelona.com/images/skip-link.svg — 200 — 534 B — 92 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-PC5BHHwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PC5BHH — 200 — 184.6 KiB — 194 ms — h2https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Logos/glomo-logo-white-header.pngwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Logos/glomo-logo-white-header.png — 200 — 6.0 KiB — 88 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=800/https://event-assets.gsma.com/News-Thumbnails/MWC26_Day4_800x533.webpwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=800/https://event-assets.gsma.com/News-Thumbnails/MWC26_Day4_800x533.webp — 200 — 66.8 KiB — 88 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=800/https://event-assets.gsma.com/News-Thumbnails/MWC26_Telco_800x533.webpwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=800/https://event-assets.gsma.com/News-Thumbnails/MWC26_Telco_800x533.webp — 200 — 81.1 KiB — 87 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=800/https://event-assets.gsma.com/News-Thumbnails/GSMA_Foundry_ESA_800x533.webpwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=800/https://event-assets.gsma.com/News-Thumbnails/GSMA_Foundry_ESA_800x533.webp — 200 — 66.1 KiB — 87 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=800/https://event-assets.gsma.com/News-Thumbnails/MWCB_Day1_PR_800x533.webpwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=800/https://event-assets.gsma.com/News-Thumbnails/MWCB_Day1_PR_800x533.webp — 200 — 22.2 KiB — 87 ms — h3https://www.mwcbarcelona.com/images/skip-link-dark.svgwww.mwcbarcelona.com/images/skip-li... https://www.mwcbarcelona.com/images/skip-link-dark.svg — 200 — 532 B — 108 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Logos/logo-mwc-gsma-300x124-optimised.pngwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Logos/logo-mwc-gsma-300x124-optimised.png — 200 — 5.6 KiB — 85 ms — h3https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=200/https://event-assets.gsma.com/apple_app_store_icon.pngwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=200/https://event-assets.gsma.com/apple_app_store_icon.png — 200 — 3.7 KiB — 84 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.6 s LCP 3.2 shttps://mwcbarcelona.com// https://mwcbarcelona.com/ — 308 — 213 B — 42 ms — h3https://www.mwcbarcelona.com/www.mwcbarcelona.com/ https://www.mwcbarcelona.com/ — 200 — 30.7 KiB — 357 ms — h3https://www.mwcbarcelona.com/cdn-cgi/speculationwww.mwcbarcelona.com/cdn-cgi/specul... https://www.mwcbarcelona.com/cdn-cgi/speculation — 200 — 325 B — 22 ms — h3https://www.mwcbarcelona.com/build/assets/css-fu2qJh6n.csswww.mwcbarcelona.com/build/assets/c... https://www.mwcbarcelona.com/build/assets/css-fu2qJh6n.css — 200 — 45.4 KiB — 72 ms — h3https://www.mwcbarcelona.com/build/assets/app-BOg1kQEw.jswww.mwcbarcelona.com/build/assets/a... https://www.mwcbarcelona.com/build/assets/app-BOg1kQEw.js — 200 — 537.1 KiB — 113 ms — h3https://www.mwcbarcelona.com/build/assets/sendbird-BSGK1Ivk.jswww.mwcbarcelona.com/build/assets/s... https://www.mwcbarcelona.com/build/assets/sendbird-BSGK1Ivk.js — 200 — 119.5 KiB — 134 ms — 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h2https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Aaron-Paul.pngwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto/https://event-assets.gsma.com/Aaron-Paul.png — 200 — 27.1 KiB — 31 ms — h3https://static.fonts.gsma.com/s/inter/v20/UcCo3FwrK3iLTcvsYwYZ8UA3J58.woff2static.fonts.gsma.com/s/inter/v20/U... https://static.fonts.gsma.com/s/inter/v20/UcCo3FwrK3iLTcvsYwYZ8UA3J58.woff2 — 200 — 130.8 KiB — 60 ms — h2https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=332/https://prd-mediarepository.cwsfirabarcelona.com/bona/bona/event28/images/cam/74/Ericsson_vertical_black_1200x1200.pngwww.mwcbarcelona.com/cdn-cgi/image/... https://www.mwcbarcelona.com/cdn-cgi/image/f=auto,w=332/https://prd-mediarepository.cwsfirabarcelona.com/bona/bona/event28/images/cam/74/Ericsson_vertical_black_1200x1200.png — 200 — 7.2 KiB — 43 ms — h3https://gsmassociation.germany-2.evergage.com/pr?.top=1025&action=Homepage_MWCB&.tt=124&.ttdns=1&.dt=860&.lt=2264&.btdns=2&.bv=16&_ak=gsmassociation&_ds=production&.scv=269&channel=Web&_r=951787&.anonId=df613e8a0ae9c195&_anon=truegsmassociation.germany-2.evergage.c... https://gsmassociation.germany-2.evergage.com/pr?.top=1025&action=Homepage_MWCB&.tt=124&.ttdns=1&.dt=860&.lt=2264&.btdns=2&.bv=16&_ak=gsmassociation&_ds=production&.scv=269&channel=Web&_r=951787&.anonId=df613e8a0ae9c195&_anon=true — 204 — 555 B — 38 ms — h2https://ads-engagement.presage.io/v2/pv/img.gif?e=pv&site=mwcbarcelona.com&t=1776901171915&full_url=https%3A%2F%2Fwww.mwcbarcelona.com%2Fads-engagement.presage.io/v2/pv/img... https://ads-engagement.presage.io/v2/pv/img.gif?e=pv&site=mwcbarcelona.com&t=1776901171915&full_url=https%3A%2F%2Fwww.mwcbarcelona.com%2F — 204 — 365 B — 41 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3764ms · 752KB · £39/mo
www.mwcbarcelona.com
Other
Costly
Execution 3315ms
Transfer 537 KB
Unused 76%
Monthly Cost £34/mo
www.mwcbarcelona.com
Other
Optional
Execution 192ms
Transfer 31 KB
Monthly Cost £2/mo
Unattributable
Other
Optional
Execution 165ms
Transfer 0 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 91ms
Transfer 185 KB
Unused 42%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.mwcbarcelona.com adds 3315ms and costs ~£34/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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.mwcbarcelona.com takes 3315ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

76% of www.mwcbarcelona.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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