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https://duolingo.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
54
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

1.62 s

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

4.52 s

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

264 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.

3.81 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

2.2 s
4.3 s
6.5 s
8.7 s
10.8 s
13.0 s
15.2 s
17.3 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 150 requests
FIX
3.4 MB transferred, 150 requests
Warning::
Page weighs 14.5 MB (3.4 MB transferred)
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Warning::
150 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.72 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
150 requests
0.72 g CO2 per page load
JavaScript 1.9 MiB 56%
Other 802.5 KiB 23%
Images 404.1 KiB 12%
Fonts 186.2 KiB 5%
CSS 84.1 KiB 2%
HTML 33.3 KiB 1%
Other 16.0 KiB 0%
Other 6.0 KiB 0%
Other 973 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
13080ms total JS execution
FIX
13080ms total JS execution
Warning::
https://d35aaqx5ub95lt.cloudfront.net/js/5314-33cb...: 6960ms CPU time
Warning::
https://www.duolingo.com/: 3786ms CPU time
Warning::
Unattributable: 786ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 493ms CPU time
Warning::
https://d35aaqx5ub95lt.cloudfront.net/js/6057-b284...: 486ms CPU time
Warning::
Third-party scripts: 13080ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Style & Layout 25% Other 23% Rendering 10%
ScriptTotalScriptingParse/CompileParty
https://d35aaqx5ub95lt.cloudfront.net/js/5314-33cb86aa.js6960ms3928ms3ms3rd
https://www.duolingo.com/3786ms2ms2ms3rd
Unattributable786ms29ms0ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js493ms440ms17ms3rd
https://d35aaqx5ub95lt.cloudfront.net/js/6057-b2849109.js486ms380ms16ms3rd
https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532e98.js446ms384ms23ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-728842606&cx=c&gtm=4e64e163ms51ms11ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TX6Z97C61ms48ms12ms3rd
F
JS Bundles
Action
30 scripts, 1.1 MB unused
FIX
30 scripts, 1.1 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532...: 175 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d35aaqx5ub95lt.cloudfront.net/js/6057-b284...: 138 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1158 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532e98.js317 KB175 KB (55%)✓3rd
https://d35aaqx5ub95lt.cloudfront.net/js/6057-b2849109.js237 KB138 KB (58%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TX6Z97C167 KB89 KB (54%)✓3rd
https://accounts.google.com/gsi/client96 KB75 KB (79%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202404.1.0/otBannerSdk.js109 KB67 KB (62%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-728842606&cx=c&gtm=4e64e1137 KB61 KB (45%)✓3rd
https://d35aaqx5ub95lt.cloudfront.net/js/5314-33cb86aa.js46 KB21 KB (47%)✓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
150 resources · 3.4 MB · 1.1 MB savings available
FIX
150 resources · 3.4 MB · 1.1 MB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Warning::
149 third-party resources (100% of weight)
Info::
4 resources over 200KB
150 resources · 3.4 MiB · 149 third-party 2.4 MiB over 1MB target
JavaScript 56% · 1.9 MiB
Other 23% · 801.7 KiB
Image 12% · 421.9 KiB
Font 5% · 186.2 KiB
CSS 3% · 88.4 KiB
Document 1% · 34.9 KiB

~1.1 MiB of savings available

Remove unused JavaScript: 1.1 MiB
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
56 images, 0 KB saveable
REVIEW
56 images, 0 KB saveable
Info::
All images are well-optimized
56 images 404 KB
0 oversized -0 KB
56 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 (186 KB)
PASS
4 fonts (186 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

186 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 1.6 s LCP 4.5 shttps://d35aaqx5ub95lt.cloudfront.net/fonts/642e24bb0295f3aee4dedcd8eecd8007.woff2642e24bb0295f3aee4dedcd... https://d35aaqx5ub95lt.cloudfront.net/fonts/642e24bb0295f3aee4dedcd8eecd8007.woff2 — 63.0 KiB — 21 ms — font-display: swaphttps://d35aaqx5ub95lt.cloudfront.net/fonts/a96f1b78ebf295556c0e9500cde6dd64.woff2a96f1b78ebf295556c0e950... https://d35aaqx5ub95lt.cloudfront.net/fonts/a96f1b78ebf295556c0e9500cde6dd64.woff2 — 63.8 KiB — 22 ms — font-display: swaphttps://d35aaqx5ub95lt.cloudfront.net/vendor/68d22534874c554b0c9ebabea379fc60.woff268d22534874c554b0c9ebab... https://d35aaqx5ub95lt.cloudfront.net/vendor/68d22534874c554b0c9ebabea379fc60.woff2 — 25.5 KiB — 62 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 104 ms — font-display: swap
642e24bb0295f3aee4dedcd... woff2 swap
Size 63 KB
Load time 21 ms
Start 785 ms
Risk FOUT — text flashes from fallback to web font
a96f1b78ebf295556c0e950... woff2 swap
Size 64 KB
Load time 22 ms
Start 785 ms
Risk FOUT — text flashes from fallback to web font
68d22534874c554b0c9ebab... woff2 swap
Size 25 KB
Load time 62 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 104 ms
Start 2.5 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
Network Waterfall
150 requests over 41809ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s FCP 1.6 s LCP 4.5 shttps://duolingo.com// https://duolingo.com/ — 302 — 91 B — 321 ms — h2https://www.duolingo.com/www.duolingo.com/ https://www.duolingo.com/ — 200 — 4.5 KiB — 358 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 70 ms — h2https://www.recaptcha.net/recaptcha/enterprise.js?render=6LcLOdsjAAAAAFfwGusLLnnn492SOGhsCh-uEAvIwww.recaptcha.net/recaptcha/enterpr... https://www.recaptcha.net/recaptcha/enterprise.js?render=6LcLOdsjAAAAAFfwGusLLnnn492SOGhsCh-uEAvI — 200 — 1.7 KiB — 101 ms — h2https://d35aaqx5ub95lt.cloudfront.net/css/6057-7317442d.cssd35aaqx5ub95lt.cloudfront.net/css/6... https://d35aaqx5ub95lt.cloudfront.net/css/6057-7317442d.css — 200 — 10.4 KiB — 12 ms — h2https://d35aaqx5ub95lt.cloudfront.net/css/app-12b7bcea.cssd35aaqx5ub95lt.cloudfront.net/css/a... https://d35aaqx5ub95lt.cloudfront.net/css/app-12b7bcea.css — 200 — 16.3 KiB — 13 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/manifest-f7fa2bf2.jsd35aaqx5ub95lt.cloudfront.net/js/ma... https://d35aaqx5ub95lt.cloudfront.net/js/manifest-f7fa2bf2.js — 200 — 6.7 KiB — 4 ms — h2https://cdn.cookielaw.org/consent/55a7f100-001e-4085-87ec-1a6d522f7d67/55a7f100-001e-4085-87ec-1a6d522f7d67.jsoncdn.cookielaw.org/consent/55a7f100-... https://cdn.cookielaw.org/consent/55a7f100-001e-4085-87ec-1a6d522f7d67/55a7f100-001e-4085-87ec-1a6d522f7d67.json — 200 — 2.5 KiB — 80 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/features-91ec4487.jsd35aaqx5ub95lt.cloudfront.net/js/fe... https://d35aaqx5ub95lt.cloudfront.net/js/features-91ec4487.js — 200 — 1.5 KiB — 6 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/8553-a0eeda7a.jsd35aaqx5ub95lt.cloudfront.net/js/85... https://d35aaqx5ub95lt.cloudfront.net/js/8553-a0eeda7a.js — 200 — 9.5 KiB — 6 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/polyfills-4de5bd64.jsd35aaqx5ub95lt.cloudfront.net/js/po... https://d35aaqx5ub95lt.cloudfront.net/js/polyfills-4de5bd64.js — 200 — 622 B — 7 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/9819-60b3ddbb.jsd35aaqx5ub95lt.cloudfront.net/js/98... https://d35aaqx5ub95lt.cloudfront.net/js/9819-60b3ddbb.js — 200 — 67.3 KiB — 19 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/strings/en-9ae2a671.jsd35aaqx5ub95lt.cloudfront.net/js/st... https://d35aaqx5ub95lt.cloudfront.net/js/strings/en-9ae2a671.js — 200 — 1.5 KiB — 12 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/6057-b2849109.jsd35aaqx5ub95lt.cloudfront.net/js/60... https://d35aaqx5ub95lt.cloudfront.net/js/6057-b2849109.js — 200 — 237.5 KiB — 38 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532e98.jsd35aaqx5ub95lt.cloudfront.net/js/ap... https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532e98.js — 200 — 316.8 KiB — 43 ms — h2https://www.duolingo.com/manifest.jsonwww.duolingo.com/manifest.json https://www.duolingo.com/manifest.json — 200 — 973 B — 308 ms — h2data:text/javascript;base64,Cg==data:text/javascript;base64,Cg== data:text/javascript;base64,Cg== — 200 — 0 B — 5 ms — datahttps://d35aaqx5ub95lt.cloudfront.net/fonts/642e24bb0295f3aee4dedcd8eecd8007.woff2d35aaqx5ub95lt.cloudfront.net/fonts... https://d35aaqx5ub95lt.cloudfront.net/fonts/642e24bb0295f3aee4dedcd8eecd8007.woff2 — 200 — 63.0 KiB — 21 ms — h2https://d35aaqx5ub95lt.cloudfront.net/fonts/a96f1b78ebf295556c0e9500cde6dd64.woff2d35aaqx5ub95lt.cloudfront.net/fonts... https://d35aaqx5ub95lt.cloudfront.net/fonts/a96f1b78ebf295556c0e9500cde6dd64.woff2 — 200 — 63.8 KiB — 22 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 362.3 KiB — 203 ms — h2https://d35aaqx5ub95lt.cloudfront.net/css/1118-ad3d3df3.cssd35aaqx5ub95lt.cloudfront.net/css/1... https://d35aaqx5ub95lt.cloudfront.net/css/1118-ad3d3df3.css — 200 — 1.6 KiB — 3 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/1118-8f62c779.jsd35aaqx5ub95lt.cloudfront.net/js/11... https://d35aaqx5ub95lt.cloudfront.net/js/1118-8f62c779.js — 200 — 3.7 KiB — 11 ms — h2https://d35aaqx5ub95lt.cloudfront.net/css/2231-92123df5.cssd35aaqx5ub95lt.cloudfront.net/css/2... https://d35aaqx5ub95lt.cloudfront.net/css/2231-92123df5.css — 200 — 1.6 KiB — 7 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/2231-791a53cd.jsd35aaqx5ub95lt.cloudfront.net/js/22... https://d35aaqx5ub95lt.cloudfront.net/js/2231-791a53cd.js — 200 — 4.4 KiB — 10 ms — h2https://d35aaqx5ub95lt.cloudfront.net/css/8186-ad3d3df3.cssd35aaqx5ub95lt.cloudfront.net/css/8... https://d35aaqx5ub95lt.cloudfront.net/css/8186-ad3d3df3.css — 200 — 1.6 KiB — 5 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/8186-1df1f4b0.jsd35aaqx5ub95lt.cloudfront.net/js/81... https://d35aaqx5ub95lt.cloudfront.net/js/8186-1df1f4b0.js — 200 — 3.8 KiB — 11 ms — h2https://d35aaqx5ub95lt.cloudfront.net/css/4800-10f90769.cssd35aaqx5ub95lt.cloudfront.net/css/4... https://d35aaqx5ub95lt.cloudfront.net/css/4800-10f90769.css — 200 — 1.4 KiB — 7 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/4800-307e38a3.jsd35aaqx5ub95lt.cloudfront.net/js/48... https://d35aaqx5ub95lt.cloudfront.net/js/4800-307e38a3.js — 200 — 3.0 KiB — 12 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TX6Z97Cwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TX6Z97C — 200 — 167.4 KiB — 195 ms — h2https://d35aaqx5ub95lt.cloudfront.net/lottie/splash/50bda50231c0bce1584e982cebfe8f33.jsond35aaqx5ub95lt.cloudfront.net/lotti... https://d35aaqx5ub95lt.cloudfront.net/lottie/splash/50bda50231c0bce1584e982cebfe8f33.json — 200 — 106.6 KiB — 42 ms — h2
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h3https://cdn.cookielaw.org/scripttemplates/202404.1.0/assets/otFlat.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202404.1.0/assets/otFlat.json — 200 — 3.3 KiB — 29 ms — h2https://cdn.cookielaw.org/scripttemplates/202404.1.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202404.1.0/assets/otCommonStyles.css — 200 — 4.3 KiB — 30 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 19 ms — h2https://excess.duolingo.com/batchexcess.duolingo.com/batch https://excess.duolingo.com/batch — 200 — 375 B — 129 ms — h2https://accounts.google.com/gsi/styleaccounts.google.com/gsi/style https://accounts.google.com/gsi/style — 200 — 665 B — 70 ms — h2https://d35aaqx5ub95lt.cloudfront.net/favicon.icod35aaqx5ub95lt.cloudfront.net/favic... https://d35aaqx5ub95lt.cloudfront.net/favicon.ico — 200 — 3.7 KiB — 3 ms — h2https://d35aaqx5ub95lt.cloudfront.net/images/pwa-icon-circle-192.pngd35aaqx5ub95lt.cloudfront.net/image... https://d35aaqx5ub95lt.cloudfront.net/images/pwa-icon-circle-192.png — 200 — 12.2 KiB — 4 ms — h2https://zombie.duolingo.com/0/web.json?user=0&ts=1776295690&tzoffset=0zombie.duolingo.com/0/web.json?user... https://zombie.duolingo.com/0/web.json?user=0&ts=1776295690&tzoffset=0 — 404 — 788 B — 5 ms — h2
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 13080ms · 909KB · €209/mo
d35aaqx5ub95lt.cloudfront.net
Other
Costly
Execution 6960ms
Transfer 46 KB
Unused 47%
Monthly Cost €111/mo
www.duolingo.com
Other
Costly
Execution 3786ms
Transfer 5 KB
Monthly Cost €61/mo
Unattributable
Other
Costly
Execution 786ms
Transfer 0 KB
Monthly Cost €13/mo
www.gstatic.com
Other
Costly
Execution 493ms
Transfer 0 KB
Unused 49%
Monthly Cost €8/mo
d35aaqx5ub95lt.cloudfront.net
Other
Costly
Execution 486ms
Transfer 237 KB
Unused 58%
Monthly Cost €8/mo
d35aaqx5ub95lt.cloudfront.net
Other
Costly
Execution 446ms
Transfer 317 KB
Unused 55%
Monthly Cost €7/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 137 KB
Unused 45%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 167 KB
Unused 54%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • d35aaqx5ub95lt.cloudfront.net adds 6960ms and costs ~€111/month
  • www.duolingo.com adds 3786ms and costs ~€61/month
  • Unattributable adds 786ms and costs ~€13/month
  • www.gstatic.com adds 493ms and costs ~€8/month
  • d35aaqx5ub95lt.cloudfront.net adds 486ms and costs ~€8/month
  • d35aaqx5ub95lt.cloudfront.net adds 446ms and costs ~€7/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

d35aaqx5ub95lt.cloudfront.net takes 6960ms 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.duolingo.com takes 3786ms 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

Unattributable takes 786ms 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.gstatic.com takes 493ms 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

d35aaqx5ub95lt.cloudfront.net takes 486ms 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

58% of d35aaqx5ub95lt.cloudfront.net'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

d35aaqx5ub95lt.cloudfront.net takes 446ms 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

55% of d35aaqx5ub95lt.cloudfront.net'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

54% of Google Tag Manager'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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