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https://babbel.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
0
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.
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.

4.04 s

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

0 ms

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

0 ms

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

0.005

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

5.83 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.

0 ms

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 57 requests
FIX
2.2 MB transferred, 57 requests
Info::
Page weighs 3.6 MB (2.2 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 275 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 275 KB
Info::
57 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
57 requests
0.47 g CO2 per page load
JavaScript 1.1 MiB 49%
Images 811.4 KiB 36%
Fonts 274.7 KiB 12%
Other 49.5 KiB 2%
HTML 29.8 KiB 1%
Other 3.1 KiB 0%
Other 2.9 KiB 0%
CSS 1.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2132ms total JS execution
FIX
2132ms total JS execution
Warning::
Unattributable: 487ms CPU time
Warning::
https://www.babbel.com/edge/?id=GTM-MDD3PT: 374ms CPU time
Warning::
https://www.babbel.com/ebb938fae15463c06bab6135f2c...: 351ms CPU time
Warning::
https://www.babbel.com/: 307ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202501.2...: 247ms CPU time
Warning::
Third-party scripts: 2132ms (100% of total)

Main Thread Breakdown

Script Evaluation 57% Other 16% Style & Layout 12% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
Unattributable487ms182ms0ms3rd
https://www.babbel.com/edge/?id=GTM-MDD3PT374ms309ms60ms3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/framework-38177bb1b2417318.js351ms302ms25ms3rd
https://www.babbel.com/307ms8ms2ms3rd
https://cdn.cookielaw.org/scripttemplates/202501.2.0/otBannerSdk.js247ms148ms41ms3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/pages/_app-2bc07254c5c4d26f.js124ms82ms41ms3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/pages/index-5445590e29e5b130.js98ms88ms1ms3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/main-edf42876ef51ffc5.js79ms65ms12ms3rd
https://wt.babbel.com/wt/web-tools.cjs65ms61ms2ms3rd
D
Page Weight Inventory
Action
57 resources · 2.2 MB · 0 KB savings available
FIX
57 resources · 2.2 MB · 0 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Warning::
56 third-party resources (100% of weight)
Info::
2 resources over 200KB
57 resources · 2.2 MiB · 56 third-party 1.2 MiB over 1MB target
JavaScript 49% · 1.1 MiB
Image 36% · 813.5 KiB
Font 12% · 274.7 KiB
Other 2% · 49.0 KiB
Document 1% · 29.8 KiB
CSS 0% · 5.6 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.

B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Info::
All images are well-optimized
9 images 811 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
4 fonts (275 KB)
PASS
4 fonts (275 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

275 KB total

Render-blocking

0

of 4

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 FCP 4.0 shttps://design-system-assets.babbel.com/fonts/graphik-babbel-lcg-regular-4c04ca457245d20e7c0ccf66bcce0516.woff2graphik-babbel-lcg-regu... https://design-system-assets.babbel.com/fonts/graphik-babbel-lcg-regular-4c04ca457245d20e7c0ccf66bcce0516.woff2 — 51.1 KiB — 145 ms — font-display: swaphttps://design-system-assets.babbel.com/fonts/feature-text-lc-regular-0dde0d520ae12ba873bf5f4b59ed2183.woff2feature-text-lc-regular... https://design-system-assets.babbel.com/fonts/feature-text-lc-regular-0dde0d520ae12ba873bf5f4b59ed2183.woff2 — 82.8 KiB — 127 ms — font-display: swaphttps://design-system-assets.babbel.com/fonts/feature-text-lc-regular-italic-f09b8140b1bac8faf4e2cec353b994d1.woff2feature-text-lc-regular... https://design-system-assets.babbel.com/fonts/feature-text-lc-regular-italic-f09b8140b1bac8faf4e2cec353b994d1.woff2 — 86.1 KiB — 152 ms — font-display: swaphttps://design-system-assets.babbel.com/fonts/graphik-babbel-lcg-semibold-77c8d3f48eb4a9b0d89e78fe2a925ed7.woff2graphik-babbel-lcg-semi... https://design-system-assets.babbel.com/fonts/graphik-babbel-lcg-semibold-77c8d3f48eb4a9b0d89e78fe2a925ed7.woff2 — 54.7 KiB — 138 ms — font-display: swap
graphik-babbel-lcg-regu... woff2 swap
Size 51 KB
Load time 145 ms
Start 436 ms
Risk FOUT — text flashes from fallback to web font
feature-text-lc-regular... woff2 swap
Size 83 KB
Load time 127 ms
Start 437 ms
Risk FOUT — text flashes from fallback to web font
feature-text-lc-regular... woff2 swap
Size 86 KB
Load time 152 ms
Start 437 ms
Risk FOUT — text flashes from fallback to web font
graphik-babbel-lcg-semi... woff2 swap
Size 55 KB
Load time 138 ms
Start 437 ms
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+
JS Bundles
26 scripts, 0 KB unused
PASS
26 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://wt.babbel.com/wt/web-tools.cjs2 KB—✓3rd
https://cdn.speedcurve.com/js/lux.es2020.js?id=29596863811 KB—✓3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/webpack-12eddf9b673a2995.js2 KB—✓3rd
https://wt.babbel.com/mt/mt.cjs2 KB—✓3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/framework-38177bb1b2417318.js43 KB—✓3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/main-edf42876ef51ffc5.js38 KB—✓3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/pages/_app-2bc07254c5c4d26f.js84 KB—✓3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/655-64ed895341534b38.js24 KB—✓3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/420-8238469d9232f5b1.js21 KB—✓3rd
https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/329-31cfc055073c6335.js4 KB—✓3rd
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
2
preload
1
dns-prefetch
—
prefetch
—

3 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
57 requests over 1243ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 4.0 shttps://babbel.com// https://babbel.com/ — 307 — 341 B — 61 ms — h2https://www.babbel.com/www.babbel.com/ https://www.babbel.com/ — 200 — 29.8 KiB — 185 ms — h2https://www.babbel.com/speculation-rules.jsonwww.babbel.com/speculation-rules.js... https://www.babbel.com/speculation-rules.json — 200 — 1.1 KiB — 23 ms — h2https://wt.babbel.com/wt/web-tools.cjswt.babbel.com/wt/web-tools.cjs https://wt.babbel.com/wt/web-tools.cjs — 200 — 1.9 KiB — 95 ms — h2https://www.babbel.com/_next/image?url=https%3A%2F%2Fimages.ctfassets.net%2Fzuzqvf4m2o58%2F3DWc31d5tAEfqbUYYLoxW5%2Fd2ec91a7375c1b2bdd55df74baca9ac6%2FHero_image_ENG_Desktop__2_.png&w=1920&q=75www.babbel.com/_next/image?url=http... https://www.babbel.com/_next/image?url=https%3A%2F%2Fimages.ctfassets.net%2Fzuzqvf4m2o58%2F3DWc31d5tAEfqbUYYLoxW5%2Fd2ec91a7375c1b2bdd55df74baca9ac6%2FHero_image_ENG_Desktop__2_.png&w=1920&q=75 — 200 — 173.9 KiB — 49 ms — h2https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/css/80ee09d2c44b0274.csswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/css/80ee09d2c44b0274.css — 200 — 1.3 KiB — 50 ms — h2https://cdn.speedcurve.com/js/lux.es2020.js?id=295968638cdn.speedcurve.com/js/lux.es2020.js... https://cdn.speedcurve.com/js/lux.es2020.js?id=295968638 — 200 — 10.8 KiB — 421 ms — h2https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/webpack-12eddf9b673a2995.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/webpack-12eddf9b673a2995.js — 200 — 2.3 KiB — 23 ms — h3https://wt.babbel.com/mt/mt.cjswt.babbel.com/mt/mt.cjs https://wt.babbel.com/mt/mt.cjs — 200 — 1.8 KiB — 53 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/framework-38177bb1b2417318.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/framework-38177bb1b2417318.js — 200 — 43.0 KiB — 62 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/main-edf42876ef51ffc5.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/main-edf42876ef51ffc5.js — 200 — 38.4 KiB — 71 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/pages/_app-2bc07254c5c4d26f.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/pages/_app-2bc07254c5c4d26f.js — 200 — 83.5 KiB — 78 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/655-64ed895341534b38.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/655-64ed895341534b38.js — 200 — 23.7 KiB — 59 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/420-8238469d9232f5b1.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/420-8238469d9232f5b1.js — 200 — 20.9 KiB — 62 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/329-31cfc055073c6335.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/329-31cfc055073c6335.js — 200 — 3.8 KiB — 48 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/958-838e726a4c081c3e.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/958-838e726a4c081c3e.js — 200 — 8.0 KiB — 45 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/34-913b88672ba37623.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/34-913b88672ba37623.js — 200 — 4.7 KiB — 52 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/108-7078f8917a4a949c.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/108-7078f8917a4a949c.js — 200 — 3.2 KiB — 42 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/218-2adea324ab5dc435.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/218-2adea324ab5dc435.js — 200 — 7.1 KiB — 53 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/141-cbd7f7b01bd7c73a.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/141-cbd7f7b01bd7c73a.js — 200 — 11.9 KiB — 54 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/567-d87097866e15152d.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/567-d87097866e15152d.js — 200 — 11.2 KiB — 54 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/pages/index-5445590e29e5b130.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/chunks/pages/index-5445590e29e5b130.js — 200 — 3.5 KiB — 57 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/ebb938fae15463c06bab6135f2cf31c4e979b032/_buildManifest.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/ebb938fae15463c06bab6135f2cf31c4e979b032/_buildManifest.js — 200 — 1.3 KiB — 46 ms — h3https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/ebb938fae15463c06bab6135f2cf31c4e979b032/_ssgManifest.jswww.babbel.com/ebb938fae15463c06bab... https://www.babbel.com/ebb938fae15463c06bab6135f2cf31c4e979b032/_next/static/ebb938fae15463c06bab6135f2cf31c4e979b032/_ssgManifest.js — 200 — 699 B — 44 ms — h3https://www.babbel.com/_next/image?url=https%3A%2F%2Fimages.ctfassets.net%2Fzuzqvf4m2o58%2F6hUHNrLE3NGCxUQCHKMTM6%2F410b50aef3c40e91dbc89116ea7e0a61%2FFrame_2085662311.png&w=1920&q=75www.babbel.com/_next/image?url=http... https://www.babbel.com/_next/image?url=https%3A%2F%2Fimages.ctfassets.net%2Fzuzqvf4m2o58%2F6hUHNrLE3NGCxUQCHKMTM6%2F410b50aef3c40e91dbc89116ea7e0a61%2FFrame_2085662311.png&w=1920&q=75 — 200 — 262.8 KiB — 58 ms — h3https://www.babbel.com/_next/image?url=https%3A%2F%2Fimages.ctfassets.net%2Fzuzqvf4m2o58%2F5pKEciNveao1Ui5BesdYCk%2F4f77c2356bc987d9b3f732a987c87764%2FFrame_2085662312.png&w=1920&q=75www.babbel.com/_next/image?url=http... https://www.babbel.com/_next/image?url=https%3A%2F%2Fimages.ctfassets.net%2Fzuzqvf4m2o58%2F5pKEciNveao1Ui5BesdYCk%2F4f77c2356bc987d9b3f732a987c87764%2FFrame_2085662312.png&w=1920&q=75 — 200 — 97.8 KiB — 35 ms — h3https://www.babbel.com/_next/image?url=https%3A%2F%2Fimages.ctfassets.net%2Fzuzqvf4m2o58%2F2cY8AFxd6I0y6FpT4LoSlV%2Fac960cbc8154afedc7bef87ae12b27a2%2FFrame_2085662313.png&w=1920&q=75www.babbel.com/_next/image?url=http... https://www.babbel.com/_next/image?url=https%3A%2F%2Fimages.ctfassets.net%2Fzuzqvf4m2o58%2F2cY8AFxd6I0y6FpT4LoSlV%2Fac960cbc8154afedc7bef87ae12b27a2%2FFrame_2085662313.png&w=1920&q=75 — 200 — 129.8 KiB — 43 ms — h3https://images.ctfassets.net/zuzqvf4m2o58/6lXpdQtU0VNkgSOzwMsdXn/b67be6acdc012a8e460fb2190d3c8c7c/Medal.svgimages.ctfassets.net/zuzqvf4m2o58/6... https://images.ctfassets.net/zuzqvf4m2o58/6lXpdQtU0VNkgSOzwMsdXn/b67be6acdc012a8e460fb2190d3c8c7c/Medal.svg — 200 — 1.7 KiB — 88 ms — h2https://design-system-assets.babbel.com/fonts/graphik-babbel-lcg-regular-4c04ca457245d20e7c0ccf66bcce0516.woff2design-system-assets.babbel.com/fon... https://design-system-assets.babbel.com/fonts/graphik-babbel-lcg-regular-4c04ca457245d20e7c0ccf66bcce0516.woff2 — 200 — 51.1 KiB — 145 ms — h2https://design-system-assets.babbel.com/fonts/feature-text-lc-regular-0dde0d520ae12ba873bf5f4b59ed2183.woff2design-system-assets.babbel.com/fon... https://design-system-assets.babbel.com/fonts/feature-text-lc-regular-0dde0d520ae12ba873bf5f4b59ed2183.woff2 — 200 — 82.8 KiB — 127 ms — h2
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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 2132ms · 1008KB · €23/mo
Unattributable
Other
Costly
Execution 487ms
Transfer 0 KB
Monthly Cost €5/mo
www.babbel.com
Other
Costly
Execution 374ms
Transfer 694 KB
Monthly Cost €4/mo
www.babbel.com
Other
Costly
Execution 351ms
Transfer 43 KB
Monthly Cost €4/mo
www.babbel.com
Other
Costly
Execution 307ms
Transfer 30 KB
Monthly Cost €3/mo
OneTrust
Consent
Essential
Execution 247ms
Transfer 114 KB
Monthly Cost €3/mo
www.babbel.com
Other
Optional
Execution 124ms
Transfer 84 KB
Monthly Cost €1/mo
www.babbel.com
Other
Optional
Execution 98ms
Transfer 3 KB
Monthly Cost €1/mo
www.babbel.com
Other
Optional
Execution 79ms
Transfer 38 KB
Monthly Cost €1/mo
wt.babbel.com
Other
Optional
Execution 65ms
Transfer 2 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 487ms and costs ~€5/month
  • www.babbel.com adds 374ms and costs ~€4/month
  • www.babbel.com adds 351ms and costs ~€4/month
  • www.babbel.com adds 307ms and costs ~€3/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

Unattributable takes 487ms 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.babbel.com takes 374ms 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.babbel.com takes 351ms 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.babbel.com takes 307ms 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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