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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

1.13 s

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

1.96 s

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

243 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.

2.88 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.

4.20 s

Page Load Progression

400 ms
800 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
15
5 PASS 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 147 requests
FIX
2.5 MB transferred, 147 requests
Warning::
Page weighs 8.3 MB (2.5 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::
147 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.52 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
147 requests
0.52 g CO2 per page load
JavaScript 1.9 MiB 76%
Images 396.5 KiB 16%
HTML 104.2 KiB 4%
Other 57.5 KiB 2%
Fonts 28.7 KiB 1%
Other 10.1 KiB 0%
CSS 7.8 KiB 0%
Other 4.2 KiB 0%
Other 2.3 KiB 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 (2.5 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
27 scripts, 780 KB unused
FIX
27 scripts, 780 KB unused
Warning::
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-b...: 152 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-b...: 112 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-b...: 103 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5JK...: 70 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 69 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 780 KB
780 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.06565108064280decbda.js429 KB152 KB (36%)✓3rd
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/13.80f8f2acf86dc720779c.js234 KB112 KB (49%)✓3rd
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.14.27e487db002ff9d5acc5.js287 KB103 KB (36%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer228 KB70 KB (31%)✓3rd
https://accounts.google.com/gsi/client96 KB69 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-927621030&cx=c&gtm=4e64e1139 KB68 KB (49%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js121 KB63 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-11173242093&cx=c&gtm=4e64e1139 KB63 KB (45%)✓3rd
https://browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js110 KB60 KB (54%)✓3rd
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/5.0ef11e1f293b9100f560.js23 KB20 KB (91%)✓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
147 resources · 2.5 MB · 780 KB savings available
FIX
147 resources · 2.5 MB · 780 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~780 KB of savings available
Warning::
146 third-party resources (100% of weight)
Info::
4 resources over 200KB
147 resources · 2.5 MiB · 146 third-party 1.5 MiB over 1MB target
JavaScript 76% · 1.9 MiB
Image 16% · 398.6 KiB
Document 4% · 104.2 KiB
Other 3% · 67.5 KiB
Font 1% · 28.7 KiB
CSS 0% · 12.3 KiB

~780.0 KiB of savings available

Remove unused JavaScript: 780.0 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, must-revalidate, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-cache, no-store, must-revalidate, max-age=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
must-revalidate—Must recheck with server after expiry
max-age0Cache for 0 seconds
C
Image Optimization
Action
79 images, 0 KB saveable
REVIEW
79 images, 0 KB saveable
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d3njjcbhbojbot.cloudfront.net/api/utilitie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
79 images 397 KB
0 oversized -0 KB
79 legacy format
14 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1539ms total JS execution
REVIEW
1539ms total JS execution
Warning::
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-b...: 727ms CPU time
Info::
Unattributable: 210ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5JK...: 196ms CPU time
Info::
https://www.coursera.org/: 179ms CPU time
Info::
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-b...: 163ms CPU time
Warning::
Third-party scripts: 1539ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 14% Script Parsing & Compilation 9% Style & Layout 7% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.06565108064280decbda.js727ms630ms34ms3rd
Unattributable210ms5ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer196ms167ms16ms3rd
https://www.coursera.org/179ms13ms10ms3rd
https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.14.27e487db002ff9d5acc5.js163ms129ms29ms3rd
https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js64ms41ms10ms3rd
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
1 fonts (29 KB)
PASS
1 fonts (29 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

29 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 2.0 shttps://d3njjcbhbojbot.cloudfront.net/web/type/source-sans-3-optimized/ss3-latin-normal.woff2ss3-latin-normal.woff2 https://d3njjcbhbojbot.cloudfront.net/web/type/source-sans-3-optimized/ss3-latin-normal.woff2 — 28.7 KiB — 59 ms — font-display: swap
ss3-latin-normal.woff2 woff2 swap
Size 29 KB
Load time 59 ms
Start 488 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+
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
147 requests over 6144ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 1.1 s LCP 2.0 shttps://coursera.org// https://coursera.org/ — 301 — 763 B — 141 ms — h2https://www.coursera.org/www.coursera.org/ https://www.coursera.org/ — 200 — 104.2 KiB — 366 ms — h2https://d3njjcbhbojbot.cloudfront.net/web/type/source-sans-3-optimized/ss3-latin-normal.woff2d3njjcbhbojbot.cloudfront.net/web/t... https://d3njjcbhbojbot.cloudfront.net/web/type/source-sans-3-optimized/ss3-latin-normal.woff2 — 200 — 28.7 KiB — 59 ms — h3https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/allStyles.f9cc3920809fef91934b.cssd3njjcbhbojbot.cloudfront.net/webap... https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/allStyles.f9cc3920809fef91934b.css — 200 — 7.2 KiB — 52 ms — h3https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/5FXwawIORyuq8SxLoUqCR1/ef32f066fd35afaf1d65d72acf4b35aa/Eurozone_%C3%A2__205_LOHP-Desktop_330x304.png?auto=format%2C%20compress&dpr=1&w=323&q=40&fit=clipd3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/5FXwawIORyuq8SxLoUqCR1/ef32f066fd35afaf1d65d72acf4b35aa/Eurozone_%C3%A2__205_LOHP-Desktop_330x304.png?auto=format%2C%20compress&dpr=1&w=323&q=40&fit=clip — 200 — 12.6 KiB — 51 ms — h3https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/X2WCEAj8bl8hShcTQbRR1/56a6d12e9b732fec9c0685f3afcb81e3/WES_40-_off_LOHP-Desktop_330x304.png?auto=format%2C%20compress&dpr=1&w=323&q=40&fit=clipd3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/X2WCEAj8bl8hShcTQbRR1/56a6d12e9b732fec9c0685f3afcb81e3/WES_40-_off_LOHP-Desktop_330x304.png?auto=format%2C%20compress&dpr=1&w=323&q=40&fit=clip — 200 — 15.9 KiB — 51 ms — h3https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/allStyles.f9cc3920809fef91934b.jsd3njjcbhbojbot.cloudfront.net/webap... https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/allStyles.f9cc3920809fef91934b.js — 200 — 741 B — 23 ms — h3https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.06565108064280decbda.jsd3njjcbhbojbot.cloudfront.net/webap... https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.06565108064280decbda.js — 200 — 428.8 KiB — 107 ms — h3https://browser.sentry-cdn.com/7.116.0/bundle.tracing.min.jsbrowser.sentry-cdn.com/7.116.0/bund... https://browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js — 200 — 110.2 KiB — 5 ms — h2https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/7rJLBhLIFG5ZTss6mYJ2vj/6040ccb86b45a0f0deb1a16d1f42b35c/courseraplus-blue.png?auto=format%2Ccompress&dpr=1&w=470&h=16d3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/7rJLBhLIFG5ZTss6mYJ2vj/6040ccb86b45a0f0deb1a16d1f42b35c/courseraplus-blue.png?auto=format%2Ccompress&dpr=1&w=470&h=16 — 200 — 2.5 KiB — 44 ms — h3https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/5QULjGwNJ5GSRz4HmpMEsv/46a5520c689eccbc33dd30b9942070f0/coursera_for_business.png?auto=format%2Ccompress&dpr=1&w=294&h=20d3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/5QULjGwNJ5GSRz4HmpMEsv/46a5520c689eccbc33dd30b9942070f0/coursera_for_business.png?auto=format%2Ccompress&dpr=1&w=294&h=20 — 200 — 2.6 KiB — 48 ms — h3https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/3S3B2Fkv9RzncshAU3v44W/035cedad8f6ab1cc7e9986d0045371e4/JoinForFreeDesktop.png?auto=format%2C%20compress&dpr=1&w=323&q=40&fit=clipd3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/3S3B2Fkv9RzncshAU3v44W/035cedad8f6ab1cc7e9986d0045371e4/JoinForFreeDesktop.png?auto=format%2C%20compress&dpr=1&w=323&q=40&fit=clip — 200 — 14.2 KiB — 62 ms — h3https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/fGHT3Go14lrW8c5Old3zy/958582e5c7c19258f4120f63e5ad8faf/Certificate.svg?auto=format%2Ccompress&dpr=1&w=50d3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/fGHT3Go14lrW8c5Old3zy/958582e5c7c19258f4120f63e5ad8faf/Certificate.svg?auto=format%2Ccompress&dpr=1&w=50 — 200 — 1.2 KiB — 54 ms — h3https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/3QMENkcLeHRCzVos6A00Iz/dd16dbb05dd75bf47034b79c9fa26d1a/Union.svg?auto=format%2Ccompress&dpr=1&w=50d3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/3QMENkcLeHRCzVos6A00Iz/dd16dbb05dd75bf47034b79c9fa26d1a/Union.svg?auto=format%2Ccompress&dpr=1&w=50 — 200 — 1.8 KiB — 47 ms — h3https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/7lPktvF7RWr8FIH3QbM7P4/d44b4b7e856e23b340c96b10773ea89d/GraduationCap.svg?auto=format%2Ccompress&dpr=1&w=50d3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/7lPktvF7RWr8FIH3QbM7P4/d44b4b7e856e23b340c96b10773ea89d/GraduationCap.svg?auto=format%2Ccompress&dpr=1&w=50 — 200 — 1.8 KiB — 69 ms — h3https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/3ZIhQ7yxmgGMFZGtlqpCG6/0d0f40bc5133948bb3805cab25af62ba/Google-G_360x360.png?auto=format%2Ccompress&dpr=1&w=24&h=24d3njjcbhbojbot.cloudfront.net/api/u... https://d3njjcbhbojbot.cloudfront.net/api/utilities/v1/imageproxy/https://images.ctfassets.net/00atxywtfxvd/3ZIhQ7yxmgGMFZGtlqpCG6/0d0f40bc5133948bb3805cab25af62ba/Google-G_360x360.png?auto=format%2Ccompress&dpr=1&w=24&h=24 — 200 — 909 B 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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 1539ms · 1169KB · €25/mo
d3njjcbhbojbot.cloudfront.net
Other
Costly
Execution 727ms
Transfer 429 KB
Unused 36%
Monthly Cost €12/mo
Unattributable
Other
Costly
Execution 210ms
Transfer 0 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 196ms
Transfer 228 KB
Unused 31%
Monthly Cost €3/mo
www.coursera.org
Other
Optional
Execution 179ms
Transfer 104 KB
Monthly Cost €3/mo
d3njjcbhbojbot.cloudfront.net
Other
Optional
Execution 163ms
Transfer 287 KB
Unused 36%
Monthly Cost €3/mo
OneTrust
Consent
Essential
Execution 64ms
Transfer 121 KB
Unused 52%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • d3njjcbhbojbot.cloudfront.net adds 727ms and costs ~€12/month
  • Unattributable adds 210ms 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

d3njjcbhbojbot.cloudfront.net takes 727ms 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 210ms 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

52% 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

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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