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https://arte.tv

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

1.89 s

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

2.75 s

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

312 ms

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

0.011

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

2.22 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.

4.76 s

Page Load Progression

425 ms
851 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
15
7 PASS 2 REVIEW 4 FIX
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 (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2232ms total JS execution
FIX
2232ms total JS execution
Warning::
https://www.arte.tv/_next/static/chunks/0v0~yvem-0...: 1391ms CPU time
Warning::
https://www.arte.tv/en/: 353ms CPU time
Info::
Unattributable: 198ms CPU time
Info::
https://polyfill.arte.tv/polyfill/v3/polyfill.min....: 106ms CPU time
Info::
https://www.arte.tv/_next/static/chunks/05hcg9gy-4...: 68ms CPU time
Warning::
Third-party scripts: 2232ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 12% Style & Layout 10% Script Parsing & Compilation 8% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.arte.tv/_next/static/chunks/0v0~yvem-0ho1.js1391ms1287ms18ms3rd
https://www.arte.tv/en/353ms7ms8ms3rd
Unattributable198ms6ms0ms3rd
https://polyfill.arte.tv/polyfill/v3/polyfill.min.js?features=Element.prototype.scrollBy&version=4.8.0106ms106ms0ms3rd
https://www.arte.tv/_next/static/chunks/05hcg9gy-4mo7.js68ms15ms10ms3rd
https://www.arte.tv/_next/static/chunks/003e35da60l_c.js65ms2ms56ms3rd
https://www.arte.tv/_next/static/chunks/04hwo-0y3l~yb.js51ms6ms45ms3rd
D
JS Bundles
Action
46 scripts, 360 KB unused
FIX
46 scripts, 360 KB unused
Warning::
https://www.arte.tv/_next/static/chunks/003e35da60...: 85 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.arte.tv/_next/static/chunks/003e35da60...: 85 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.arte.tv/_next/static/chunks/04hwo-0y3l...: 52 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.arte.tv/_next/static/chunks/04hwo-0y3l...: 52 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.arte.tv/_next/static/chunks/04s5omuefo...: 22 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 360 KB
360 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.arte.tv/_next/static/chunks/003e35da60l_c.js0 KB85 KB (47%)✓3rd
https://www.arte.tv/_next/static/chunks/003e35da60l_c.js181 KB85 KB (47%)✓3rd
https://www.arte.tv/_next/static/chunks/04hwo-0y3l~yb.js153 KB52 KB (34%)✓3rd
https://www.arte.tv/_next/static/chunks/04hwo-0y3l~yb.js0 KB52 KB (34%)✓3rd
https://www.arte.tv/_next/static/chunks/04s5omuefokmf.js0 KB22 KB (56%)✓3rd
https://www.arte.tv/_next/static/chunks/04s5omuefokmf.js39 KB22 KB (56%)✓3rd
https://www.arte.tv/_next/static/chunks/0v0~yvem-0ho1.js71 KB21 KB (30%)✓3rd
https://www.arte.tv/_next/static/chunks/0v0~yvem-0ho1.js0 KB21 KB (30%)✓3rd
https://www.arte.tv/_next/static/chunks/0s2zz~x8y9154.js3 KB—✓3rd
https://www.arte.tv/_next/static/chunks/0rn04f0508uz3.js9 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
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.

B
Page Weight Budget
1.1 MB transferred, 78 requests
REVIEW
1.1 MB transferred, 78 requests
Info::
Page weighs 6.1 MB (1.1 MB transferred)
Warning::
JavaScript is 669 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 669 KB
Info::
78 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
78 requests
0.24 g CO2 per page load
JavaScript 669.1 KiB 58%
HTML 177.8 KiB 15%
Images 154.0 KiB 13%
Fonts 153.6 KiB 13%
Other 3.5 KiB 0%
Other 2.0 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

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

B
Page Weight Inventory
78 resources · 1.1 MB · 360 KB savings available
REVIEW
78 resources · 1.1 MB · 360 KB savings available
Warning::
Page weight 136 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~360 KB of savings available
Warning::
77 third-party resources (100% of weight)
78 resources · 1.1 MiB · 77 third-party 136.1 KiB over 1MB target
JavaScript 58% · 669.1 KiB
Document 15% · 177.8 KiB
Image 13% · 154.0 KiB
Font 13% · 153.6 KiB
Other 0% · 5.6 KiB

~359.8 KiB of savings available

Remove unused JavaScript: 359.8 KiB
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+
Image Optimization
6 images, 0 KB saveable
PASS
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 154 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
8 fonts (154 KB)
PASS
8 fonts (154 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

154 KB total

Render-blocking

0

of 8

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 4.0 s 5.0 s FCP 1.9 s LCP 2.8 shttps://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Bold.woff2Barna-Bold.woff2 https://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Bold.woff2 — 38.7 KiB — 832 ms — font-display: swaphttps://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Regular.woff2Barna-Regular.woff2 https://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Regular.woff2 — 38.2 KiB — 756 ms — font-display: swaphttps://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-SemiBold.woff2Barna-SemiBold.woff2 https://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-SemiBold.woff2 — 38.6 KiB — 649 ms — font-display: swaphttps://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Light.woff2Barna-Light.woff2 https://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Light.woff2 — 38.0 KiB — 889 ms — font-display: swaphttps://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Light.woff2Barna-Light.woff2 https://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Light.woff2 — 0 B — 0 ms — font-display: swaphttps://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Regular.woff2Barna-Regular.woff2 https://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Regular.woff2 — 0 B — 0 ms — font-display: swaphttps://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-SemiBold.woff2Barna-SemiBold.woff2 https://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-SemiBold.woff2 — 0 B — 0 ms — font-display: swaphttps://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Bold.woff2Barna-Bold.woff2 https://static-cdn.arte.tv/static/fonts/barna-web/woff2/Barna-Bold.woff2 — 0 B — 0 ms — font-display: swap
Barna-Bold.woff2 woff2 swap
Size 39 KB
Load time 832 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
Barna-Regular.woff2 woff2 swap
Size 38 KB
Load time 756 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
Barna-SemiBold.woff2 woff2 swap
Size 39 KB
Load time 649 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
Barna-Light.woff2 woff2 swap
Size 38 KB
Load time 889 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
Barna-Light.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 4.9 s
Risk FOUT — text flashes from fallback to web font
Barna-Regular.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 4.9 s
Risk FOUT — text flashes from fallback to web font
Barna-SemiBold.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 4.9 s
Risk FOUT — text flashes from fallback to web font
Barna-Bold.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 4.9 s
Risk FOUT — text flashes from fallback to web font
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 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: Google Cloud

Network Waterfall
78 requests over 6371ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 1.9 s LCP 2.8 shttps://arte.tv// https://arte.tv/ — 301 — 83 B — 454 ms — h2https://www.arte.tv/www.arte.tv/ https://www.arte.tv/ — 301 — 176 B — 563 ms — h2https://www.arte.tv/en/www.arte.tv/en/ https://www.arte.tv/en/ — 200 — 112.7 KiB — 464 ms — h2https://api-cdn.arte.tv/img/v2/image/N7JfEqXBuFTZxQ2CJektKo/1400x788api-cdn.arte.tv/img/v2/image/N7JfEq... https://api-cdn.arte.tv/img/v2/image/N7JfEqXBuFTZxQ2CJektKo/1400x788 — 200 — 84.0 KiB — 421 ms — h2https://www.arte.tv/_next/static/chunks/17x9nz_mfhi5o.jswww.arte.tv/_next/static/chunks/17x... https://www.arte.tv/_next/static/chunks/17x9nz_mfhi5o.js — 200 — 2.3 KiB — 310 ms — h2https://www.arte.tv/static/design-system/scripts/bowser@2.11.0.jswww.arte.tv/static/design-system/sc... https://www.arte.tv/static/design-system/scripts/bowser@2.11.0.js — 200 — 6.0 KiB — 300 ms — h2https://polyfill.arte.tv/polyfill/v3/polyfill.min.js?features=Element.prototype.scrollBy&version=4.8.0polyfill.arte.tv/polyfill/v3/polyfi... https://polyfill.arte.tv/polyfill/v3/polyfill.min.js?features=Element.prototype.scrollBy&version=4.8.0 — 200 — 388 B — 421 ms — h2https://www.arte.tv/_next/static/chunks/0rn04f0508uz3.jswww.arte.tv/_next/static/chunks/0rn... https://www.arte.tv/_next/static/chunks/0rn04f0508uz3.js — 200 — 8.8 KiB — 256 ms — h2https://www.arte.tv/_next/static/chunks/0v0~yvem-0ho1.jswww.arte.tv/_next/static/chunks/0v0... https://www.arte.tv/_next/static/chunks/0v0~yvem-0ho1.js — 200 — 71.1 KiB — 262 ms — h2https://www.arte.tv/_next/static/chunks/04s5omuefokmf.jswww.arte.tv/_next/static/chunks/04s... https://www.arte.tv/_next/static/chunks/04s5omuefokmf.js — 200 — 38.7 KiB — 287 ms — h2https://www.arte.tv/_next/static/chunks/0-l6-j0ljgdvc.jswww.arte.tv/_next/static/chunks/0-l... https://www.arte.tv/_next/static/chunks/0-l6-j0ljgdvc.js — 200 — 8.4 KiB — 290 ms — h2https://www.arte.tv/_next/static/chunks/turbopack-15j9fwpu75oc0.jswww.arte.tv/_next/static/chunks/tur... https://www.arte.tv/_next/static/chunks/turbopack-15j9fwpu75oc0.js — 200 — 4.8 KiB — 295 ms — h2https://www.arte.tv/_next/static/chunks/0f8uvcgqjxunf.jswww.arte.tv/_next/static/chunks/0f8... https://www.arte.tv/_next/static/chunks/0f8uvcgqjxunf.js — 200 — 457 B — 292 ms — h2https://www.arte.tv/_next/static/chunks/0x~h6266evwgt.jswww.arte.tv/_next/static/chunks/0x~... https://www.arte.tv/_next/static/chunks/0x~h6266evwgt.js — 200 — 14.4 KiB — 301 ms — h2https://www.arte.tv/_next/static/chunks/0644z.~o3nce6.jswww.arte.tv/_next/static/chunks/064... https://www.arte.tv/_next/static/chunks/0644z.~o3nce6.js — 200 — 3.4 KiB — 309 ms — h2https://www.arte.tv/_next/static/chunks/0jpcb2.b_3oy6.jswww.arte.tv/_next/static/chunks/0jp... https://www.arte.tv/_next/static/chunks/0jpcb2.b_3oy6.js — 200 — 9.2 KiB — 305 ms — h2https://www.arte.tv/_next/static/chunks/0exp4-lrw11aj.jswww.arte.tv/_next/static/chunks/0ex... https://www.arte.tv/_next/static/chunks/0exp4-lrw11aj.js — 200 — 12.3 KiB — 315 ms — h2https://www.arte.tv/_next/static/chunks/0_0pjip_e.e-5.jswww.arte.tv/_next/static/chunks/0_0... https://www.arte.tv/_next/static/chunks/0_0pjip_e.e-5.js — 200 — 38.9 KiB — 336 ms — h2https://www.arte.tv/_next/static/chunks/0_sb3.xm1d2tt.jswww.arte.tv/_next/static/chunks/0_s... https://www.arte.tv/_next/static/chunks/0_sb3.xm1d2tt.js — 200 — 11.0 KiB — 347 ms — h2https://www.arte.tv/_next/static/chunks/04ntwx1v_gxdx.jswww.arte.tv/_next/static/chunks/04n... https://www.arte.tv/_next/static/chunks/04ntwx1v_gxdx.js — 200 — 9.7 KiB — 351 ms — h2https://www.arte.tv/_next/static/chunks/04hwo-0y3l~yb.jswww.arte.tv/_next/static/chunks/04h... https://www.arte.tv/_next/static/chunks/04hwo-0y3l~yb.js — 200 — 153.5 KiB — 425 ms — h2https://www.arte.tv/_next/static/chunks/003e35da60l_c.jswww.arte.tv/_next/static/chunks/003... https://www.arte.tv/_next/static/chunks/003e35da60l_c.js — 200 — 181.2 KiB — 475 ms — h2https://www.arte.tv/_next/static/chunks/05hcg9gy-4mo7.jswww.arte.tv/_next/static/chunks/05h... https://www.arte.tv/_next/static/chunks/05hcg9gy-4mo7.js — 200 — 20.8 KiB — 497 ms — h2https://www.arte.tv/_next/static/chunks/0nn.ngdv73jpx.jswww.arte.tv/_next/static/chunks/0nn... https://www.arte.tv/_next/static/chunks/0nn.ngdv73jpx.js — 200 — 15.9 KiB — 479 ms — h2https://www.arte.tv/_next/static/chunks/0tzeggt5l0yr9.jswww.arte.tv/_next/static/chunks/0tz... https://www.arte.tv/_next/static/chunks/0tzeggt5l0yr9.js — 200 — 2.4 KiB — 485 ms — h2https://www.arte.tv/_next/static/chunks/0i2ofpz6~fz4..jswww.arte.tv/_next/static/chunks/0i2... https://www.arte.tv/_next/static/chunks/0i2ofpz6~fz4..js — 200 — 576 B — 491 ms — h2https://www.arte.tv/_next/static/chunks/0s2zz~x8y9154.jswww.arte.tv/_next/static/chunks/0s2... https://www.arte.tv/_next/static/chunks/0s2zz~x8y9154.js — 200 — 3.3 KiB — 493 ms — h2https://api-cdn.arte.tv/img/v2/image/XAfCKPeHmJGBccywyKQy63/430x242?type=TEXTapi-cdn.arte.tv/img/v2/image/XAfCKP... https://api-cdn.arte.tv/img/v2/image/XAfCKPeHmJGBccywyKQy63/430x242?type=TEXT — 200 — 9.3 KiB — 406 ms — h2https://api-cdn.arte.tv/img/v2/image/hVQidojNoKdamS7EMhjJGF/430x242?type=TEXTapi-cdn.arte.tv/img/v2/image/hVQido... https://api-cdn.arte.tv/img/v2/image/hVQidojNoKdamS7EMhjJGF/430x242?type=TEXT — 200 — 21.1 KiB — 403 ms — h2https://api-cdn.arte.tv/img/v2/image/8oWeHmddXQqsoJVtRstSJL/430x242?type=TEXTapi-cdn.arte.tv/img/v2/image/8oWeHm... https://api-cdn.arte.tv/img/v2/image/8oWeHmddXQqsoJVtRstSJL/430x242?type=TEXT — 200 — 19.3 KiB — 413 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 1.9 s LCP 2.8 shttps://arte.tv// https://arte.tv/ — 301 — 83 B — 454 ms — h2https://www.arte.tv/www.arte.tv/ https://www.arte.tv/ — 301 — 176 B — 563 ms — h2https://www.arte.tv/en/www.arte.tv/en/ https://www.arte.tv/en/ — 200 — 112.7 KiB — 464 ms — h2https://api-cdn.arte.tv/img/v2/image/N7JfEqXBuFTZxQ2CJektKo/1400x788api-cdn.arte.tv/img/v2/image/N7JfEq... https://api-cdn.arte.tv/img/v2/image/N7JfEqXBuFTZxQ2CJektKo/1400x788 — 200 — 84.0 KiB — 421 ms — h2https://www.arte.tv/_next/static/chunks/17x9nz_mfhi5o.jswww.arte.tv/_next/static/chunks/17x... https://www.arte.tv/_next/static/chunks/17x9nz_mfhi5o.js — 200 — 2.3 KiB — 310 ms — h2https://www.arte.tv/static/design-system/scripts/bowser@2.11.0.jswww.arte.tv/static/design-system/sc... https://www.arte.tv/static/design-system/scripts/bowser@2.11.0.js — 200 — 6.0 KiB — 300 ms — h2https://polyfill.arte.tv/polyfill/v3/polyfill.min.js?features=Element.prototype.scrollBy&version=4.8.0polyfill.arte.tv/polyfill/v3/polyfi... https://polyfill.arte.tv/polyfill/v3/polyfill.min.js?features=Element.prototype.scrollBy&version=4.8.0 — 200 — 388 B — 421 ms — h2https://www.arte.tv/_next/static/chunks/0rn04f0508uz3.jswww.arte.tv/_next/static/chunks/0rn... https://www.arte.tv/_next/static/chunks/0rn04f0508uz3.js — 200 — 8.8 KiB — 256 ms — h2https://www.arte.tv/_next/static/chunks/0v0~yvem-0ho1.jswww.arte.tv/_next/static/chunks/0v0... https://www.arte.tv/_next/static/chunks/0v0~yvem-0ho1.js — 200 — 71.1 KiB — 262 ms — h2https://www.arte.tv/_next/static/chunks/04s5omuefokmf.jswww.arte.tv/_next/static/chunks/04s... https://www.arte.tv/_next/static/chunks/04s5omuefokmf.js — 200 — 38.7 KiB — 287 ms — h2https://www.arte.tv/_next/static/chunks/0-l6-j0ljgdvc.jswww.arte.tv/_next/static/chunks/0-l... https://www.arte.tv/_next/static/chunks/0-l6-j0ljgdvc.js — 200 — 8.4 KiB — 290 ms — h2https://www.arte.tv/_next/static/chunks/turbopack-15j9fwpu75oc0.jswww.arte.tv/_next/static/chunks/tur... https://www.arte.tv/_next/static/chunks/turbopack-15j9fwpu75oc0.js — 200 — 4.8 KiB — 295 ms — h2https://www.arte.tv/_next/static/chunks/0f8uvcgqjxunf.jswww.arte.tv/_next/static/chunks/0f8... https://www.arte.tv/_next/static/chunks/0f8uvcgqjxunf.js — 200 — 457 B — 292 ms — h2https://www.arte.tv/_next/static/chunks/0x~h6266evwgt.jswww.arte.tv/_next/static/chunks/0x~... https://www.arte.tv/_next/static/chunks/0x~h6266evwgt.js — 200 — 14.4 KiB — 301 ms — h2https://www.arte.tv/_next/static/chunks/0644z.~o3nce6.jswww.arte.tv/_next/static/chunks/064... https://www.arte.tv/_next/static/chunks/0644z.~o3nce6.js — 200 — 3.4 KiB — 309 ms — h2https://www.arte.tv/_next/static/chunks/0jpcb2.b_3oy6.jswww.arte.tv/_next/static/chunks/0jp... https://www.arte.tv/_next/static/chunks/0jpcb2.b_3oy6.js — 200 — 9.2 KiB — 305 ms — 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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 2232ms · 113KB · €28/mo
www.arte.tv
Other
Costly
Execution 1391ms
Transfer 0 KB
Unused 30%
Monthly Cost €17/mo
www.arte.tv
Other
Costly
Execution 353ms
Transfer 113 KB
Monthly Cost €4/mo
Unattributable
Other
Optional
Execution 198ms
Transfer 0 KB
Monthly Cost €2/mo
polyfill.arte.tv
Other
Optional
Execution 106ms
Transfer 0 KB
Monthly Cost €1/mo
www.arte.tv
Other
Optional
Execution 68ms
Transfer 0 KB
Monthly Cost €1/mo
www.arte.tv
Other
Optional
Execution 65ms
Transfer 0 KB
Unused 47%
Monthly Cost €1/mo
www.arte.tv
Other
Optional
Execution 51ms
Transfer 0 KB
Unused 34%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.arte.tv adds 1391ms and costs ~€17/month
  • www.arte.tv adds 353ms and costs ~€4/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.arte.tv takes 1391ms 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

www.arte.tv takes 353ms 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

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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