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https://duolingo.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
33
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.
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.

5.47 s

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

14.15 s

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

1.78 s

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.

6.17 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.

22.04 s

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
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.5 MB transferred, 157 requests
FIX
3.5 MB transferred, 157 requests
Warning::
Page weighs 14.6 MB (3.5 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::
157 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.74 g CO2 per page load
3.5 MB / 2.4 MB budget
3.5 MB transferred
157 requests
0.74 g CO2 per page load
JavaScript 1.9 MiB 55%
Other 802.5 KiB 22%
Images 507.0 KiB 14%
Fonts 199.2 KiB 5%
CSS 84.1 KiB 2%
HTML 33.1 KiB 1%
Other 16.0 KiB 0%
Other 6.8 KiB 0%
Other 979 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 (3.5 MiB of 3.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
8373ms total JS execution
FIX
8373ms total JS execution
Warning::
Unattributable: 2492ms CPU time
Warning::
https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532...: 1879ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 1690ms CPU time
Warning::
https://d35aaqx5ub95lt.cloudfront.net/js/6057-b284...: 1214ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-728...: 308ms CPU time
Warning::
Third-party scripts: 8373ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 27% Style & Layout 8% Script Parsing & Compilation 5% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
Unattributable2492ms115ms0ms3rd
https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532e98.js1879ms1593ms91ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js1690ms1260ms70ms3rd
https://d35aaqx5ub95lt.cloudfront.net/js/6057-b2849109.js1214ms982ms58ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-728842606&cx=c&gtm=4e64e1308ms191ms32ms3rd
https://www.duolingo.com/290ms5ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TX6Z97C205ms163ms38ms3rd
https://cdn.cookielaw.org/scripttemplates/202404.1.0/otBannerSdk.js134ms75ms34ms3rd
https://accounts.google.com/gsi/client55ms36ms19ms3rd
https://d35aaqx5ub95lt.cloudfront.net/js/7459-a5fbe219.js54ms50ms1ms3rd

Showing top 10 of 11 scripts

F
JS Bundles
Action
30 scripts, 1.1 MB unused
FIX
30 scripts, 1.1 MB unused
Warning::
https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532...: 182 KB unused (58%)
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://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/6057-b284...: 138 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1144 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://d35aaqx5ub95lt.cloudfront.net/js/app-6c532e98.js317 KB182 KB (58%)✓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://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓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 (78%)✓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/8186-1df1f4b0.js4 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
157 resources · 3.5 MB · 1.1 MB savings available
FIX
157 resources · 3.5 MB · 1.1 MB savings available
Warning::
Page weight 2.5 MB over 1MB target
Got: 3.5 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Warning::
156 third-party resources (100% of weight)
Info::
4 resources over 200KB
157 resources · 3.5 MiB · 156 third-party 2.5 MiB over 1MB target
JavaScript 55% · 1.9 MiB
Other 22% · 802.4 KiB
Image 14% · 524.8 KiB
Font 5% · 199.2 KiB
CSS 2% · 88.4 KiB
Document 1% · 34.8 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
59 images, 0 KB saveable
REVIEW
59 images, 0 KB saveable
Warning::
https://d35aaqx5ub95lt.cloudfront.net/images/splas... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
59 images 507 KB
0 oversized -0 KB
59 legacy format
1 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

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 (199 KB)
PASS
4 fonts (199 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

199 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 5.5 s LCP 14.1 shttps://d35aaqx5ub95lt.cloudfront.net/vendor/f2331bbfd902cdf8971c4d3184a44283.woff2f2331bbfd902cdf8971c4d3... https://d35aaqx5ub95lt.cloudfront.net/vendor/f2331bbfd902cdf8971c4d3184a44283.woff2 — 75.2 KiB — 16 ms — font-display: swaphttps://d35aaqx5ub95lt.cloudfront.net/vendor/3bbe299f41d8289a47d91773fee0cb6a.woff23bbe299f41d8289a47d9177... https://d35aaqx5ub95lt.cloudfront.net/vendor/3bbe299f41d8289a47d91773fee0cb6a.woff2 — 64.7 KiB — 16 ms — font-display: swaphttps://d35aaqx5ub95lt.cloudfront.net/vendor/68d22534874c554b0c9ebabea379fc60.woff268d22534874c554b0c9ebab... https://d35aaqx5ub95lt.cloudfront.net/vendor/68d22534874c554b0c9ebabea379fc60.woff2 — 25.5 KiB — 31 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 85 ms — font-display: swap
f2331bbfd902cdf8971c4d3... woff2 swap
Size 75 KB
Load time 16 ms
Start 792 ms
Risk FOUT — text flashes from fallback to web font
3bbe299f41d8289a47d9177... woff2 swap
Size 65 KB
Load time 16 ms
Start 793 ms
Risk FOUT — text flashes from fallback to web font
68d22534874c554b0c9ebab... woff2 swap
Size 25 KB
Load time 31 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 85 ms
Start 2.4 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+
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
157 requests over 35794ms
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 FCP 5.5 s LCP 14.1 shttps://duolingo.com// https://duolingo.com/ — 302 — 91 B — 300 ms — h2https://www.duolingo.com/www.duolingo.com/ https://www.duolingo.com/ — 200 — 4.5 KiB — 346 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 111 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 — 119 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 — 46 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 — 47 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 — 81 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 — 3 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 — 4 ms — h2https://d35aaqx5ub95lt.cloudfront.net/js/polyfills-4de5bd64.jsd35aaqx5ub95lt.cloudfront.net/js/po... https://d35aaqx5ub95lt.cloudfront.net/js/polyfills-4de5bd64.js — 200 — 621 B — 6 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 — 15 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 — 9 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 — 28 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 — 31 ms — h2data:text/javascript;base64,Cg==data:text/javascript;base64,Cg== data:text/javascript;base64,Cg== — 200 — 0 B — 0 ms — datahttps://d35aaqx5ub95lt.cloudfront.net/vendor/f2331bbfd902cdf8971c4d3184a44283.woff2d35aaqx5ub95lt.cloudfront.net/vendo... https://d35aaqx5ub95lt.cloudfront.net/vendor/f2331bbfd902cdf8971c4d3184a44283.woff2 — 200 — 75.2 KiB — 16 ms — h2https://d35aaqx5ub95lt.cloudfront.net/vendor/3bbe299f41d8289a47d91773fee0cb6a.woff2d35aaqx5ub95lt.cloudfront.net/vendo... https://d35aaqx5ub95lt.cloudfront.net/vendor/3bbe299f41d8289a47d91773fee0cb6a.woff2 — 200 — 64.7 KiB — 16 ms — h2https://www.duolingo.com/manifest.jsonwww.duolingo.com/manifest.json https://www.duolingo.com/manifest.json — 200 — 979 B — 355 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 — 214 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 — 4 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 — 4 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 — 9 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 — 7 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 — 7 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 — 5 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 — 8 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 — 217 ms — h2https://d35aaqx5ub95lt.cloudfront.net/images/owls/14869f1103f5de3588f55271a5e478c1.svgd35aaqx5ub95lt.cloudfront.net/image... https://d35aaqx5ub95lt.cloudfront.net/images/owls/14869f1103f5de3588f55271a5e478c1.svg — 200 — 2.5 KiB — 4 ms — h2
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https://www.google.com/ccm/collect?rcb=18&frm=0&en=page_view&dl=https%3A%2F%2Fwww.duolingo.com%2F&scrsrc=www.googletagmanager.com&rnd=196965903.1776295592&dt=Duolingo%20-%20The%20world%E2%80%99s%20most%20popular%20way%20to%20learn&auid=2032779845.1776295592&navt=n&npa=1&gtm=45be64e1v9103119162z8811879556za20gzb811879556zd811879556xec&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=1&tids=AW-728842606&tid=AW-728842606&tft=1776295591945&tfd=2251 — 200 — 21 B — 76 ms — 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 — 30 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://excess.duolingo.com/batchexcess.duolingo.com/batch https://excess.duolingo.com/batch — 200 — 375 B — 117 ms — h2https://www.recaptcha.net/recaptcha/enterprise/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4www.recaptcha.net/recaptcha/enterpr... https://www.recaptcha.net/recaptcha/enterprise/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 — 200 — 141 B — 195 ms — h2https://www.gstatic.com/recaptcha/api2/logo_48.pngwww.gstatic.com/recaptcha/api2/logo... https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.3 KiB — 31 ms — h2https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 33.9 KiB — 85 ms — h3https://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 — 11 ms — h2https://accounts.google.com/gsi/styleaccounts.google.com/gsi/style https://accounts.google.com/gsi/style — 200 — 665 B — 73 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 — 5 ms — h2https://zombie.duolingo.com/0/web.json?user=0&ts=1776295625&tzoffset=0zombie.duolingo.com/0/web.json?user... https://zombie.duolingo.com/0/web.json?user=0&ts=1776295625&tzoffset=0 — 404 — 774 B — 4 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 8373ms · 1085KB · €134/mo
Unattributable
Other
Costly
Execution 2492ms
Transfer 0 KB
Monthly Cost €40/mo
d35aaqx5ub95lt.cloudfront.net
Other
Costly
Execution 1879ms
Transfer 317 KB
Unused 58%
Monthly Cost €30/mo
www.gstatic.com
Other
Costly
Execution 1690ms
Transfer 0 KB
Unused 49%
Monthly Cost €27/mo
d35aaqx5ub95lt.cloudfront.net
Other
Costly
Execution 1214ms
Transfer 237 KB
Unused 58%
Monthly Cost €19/mo
Google Tag Manager
Tag Manager
Costly
Execution 308ms
Transfer 137 KB
Unused 45%
Monthly Cost €5/mo
www.duolingo.com
Other
Costly
Execution 290ms
Transfer 5 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 205ms
Transfer 167 KB
Unused 54%
Monthly Cost €3/mo
OneTrust
Consent
Essential
Execution 134ms
Transfer 109 KB
Unused 62%
Monthly Cost €2/mo
accounts.google.com
Other
Optional
Execution 55ms
Transfer 96 KB
Unused 78%
Monthly Cost €1/mo
d35aaqx5ub95lt.cloudfront.net
Other
Optional
Execution 54ms
Transfer 7 KB
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 53ms
Transfer 9 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 2492ms and costs ~€40/month
  • d35aaqx5ub95lt.cloudfront.net adds 1879ms and costs ~€30/month
  • www.gstatic.com adds 1690ms and costs ~€27/month
  • d35aaqx5ub95lt.cloudfront.net adds 1214ms and costs ~€19/month
  • Google Tag Manager adds 308ms and costs ~€5/month
  • www.duolingo.com adds 290ms and costs ~€5/month
  • Google Tag Manager adds 205ms 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 2492ms 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 1879ms 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

www.gstatic.com takes 1690ms 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 1214ms 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

Google Tag Manager takes 308ms 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 290ms 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

Google Tag Manager takes 205ms 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

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

62% of OneTrust'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

78% of accounts.google.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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