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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
80
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

976 ms

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

1.29 s

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

274 ms

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

0.068

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

1.96 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.

4.65 s

Page Load Progression

659 ms
1.3 s
2.0 s
2.6 s
3.3 s
4.0 s
4.6 s
5.3 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.0 MB transferred, 101 requests
FIX
4.0 MB transferred, 101 requests
Critical::
Page weighs 9.2 MB (4.0 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Warning::
101 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.83 g CO2 per page load
4.0 MB / 2.4 MB budget
4.0 MB transferred
101 requests
0.83 g CO2 per page load
Images 2.2 MiB 56%
JavaScript 1.6 MiB 39%
HTML 129.1 KiB 3%
Fonts 46.3 KiB 1%
Other 4.7 KiB 0%
CSS 2.0 KiB 0%
Other 1.8 KiB 0%
Other 1.2 KiB 0%
Other 936 B 0%
Other 628 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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 (4.0 MiB of 4.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
59 scripts, 481 KB unused
FIX
59 scripts, 481 KB unused
Warning::
https://www.datacamp.com/_next/static/chunks/pages...: 199 KB unused (34%)
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.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0VFS...: 64 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.onesignal.com/sdks/OneSignalPageSDKES6...: 60 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TGG...: 60 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 481 KB
481 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.datacamp.com/_next/static/chunks/pages/_app-f7e9c71fee037706.js622 KB199 KB (34%)✓3rd
https://accounts.google.com/gsi/client96 KB69 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0VFSSYW4KG&cx=c&gtm=4e64k0167 KB64 KB (39%)✓3rd
https://cdn.onesignal.com/sdks/OneSignalPageSDKES6.js?v=15160769 KB60 KB (88%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TGGWB2P&gtm_auth=z30B2gnFx7YaJZsA-wGD8A&gtm_preview=env-2&gtm_cookies_win=x177 KB60 KB (34%)✓3rd
https://www.datacamp.com/_next/static/chunks/framework-14a02dd5e036ebf0.js58 KB29 KB (51%)✓3rd
https://www.datacamp.com/_next/static/VCN6wdJ4f36TAEfaV2Flz/_buildManifest.js5 KB—✓3rd
https://bat.bing.com/bat.js15 KB—✓3rd
https://www.datacamp.com/_next/static/chunks/86589.c2d18562d0900061.js1 KB—✓3rd
https://www.datacamp.com/_next/static/chunks/72815.978bf9cfc27095eb.js3 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
101 resources · 4.0 MB · 481 KB savings available
FIX
101 resources · 4.0 MB · 481 KB savings available
Warning::
Page weight 3.0 MB over 1MB target
Got: 4.0 MB Expected: ≤ 1 MB
Info::
~481 KB of savings available
Warning::
100 third-party resources (100% of weight)
Info::
3 resources over 200KB
101 resources · 4.0 MiB · 100 third-party 3.0 MiB over 1MB target
Image 56% · 2.2 MiB
JavaScript 39% · 1.6 MiB
Document 3% · 129.1 KiB
Font 1% · 46.3 KiB
Other 0% · 4.8 KiB
CSS 0% · 2.0 KiB

~480.9 KiB of savings available

Remove unused JavaScript: 480.9 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
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Info::
All images are well-optimized
19 images 2.2 MB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1960ms total JS execution
REVIEW
1960ms total JS execution
Warning::
https://www.datacamp.com/: 744ms CPU time
Warning::
https://www.datacamp.com/_next/static/chunks/frame...: 507ms CPU time
Warning::
https://www.datacamp.com/_next/static/chunks/pages...: 252ms CPU time
Info::
Unattributable: 171ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TGG...: 146ms CPU time
Warning::
Third-party scripts: 1960ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 21% Style & Layout 11% Rendering 11% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.datacamp.com/744ms2ms0ms3rd
https://www.datacamp.com/_next/static/chunks/framework-14a02dd5e036ebf0.js507ms475ms5ms3rd
https://www.datacamp.com/_next/static/chunks/pages/_app-f7e9c71fee037706.js252ms160ms65ms3rd
Unattributable171ms7ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TGGWB2P&gtm_auth=z30B2gnFx7YaJZsA-wGD8A&gtm_preview=env-2&gtm_cookies_win=x146ms112ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0VFSSYW4KG&cx=c&gtm=4e64k085ms73ms11ms3rd
https://www.datacamp.com/_next/static/chunks/pages/index-b2b0756740fcb913.js55ms52ms2ms3rd
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
3 fonts (46 KB)
PASS
3 fonts (46 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

46 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 976 ms LCP 1.3 shttps://dcmfe.datacamp.com/assets/fonts/StudioFeixenSansRegular-english-v2.woff2StudioFeixenSansRegular... https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSansRegular-english-v2.woff2 — 19.2 KiB — 70 ms — font-display: swaphttps://dcmfe.datacamp.com/assets/fonts/StudioFeixenSans-Semibold-english.woff2StudioFeixenSans-Semibo... https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSans-Semibold-english.woff2 — 18.8 KiB — 80 ms — font-display: swaphttps://dcmfe.datacamp.com/assets/fonts/StudioFeixenSansRegular-latin-v2.woff2StudioFeixenSansRegular... https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSansRegular-latin-v2.woff2 — 8.3 KiB — 26 ms — font-display: swap
StudioFeixenSansRegular... woff2 swap
Size 19 KB
Load time 70 ms
Start 380 ms
Risk FOUT — text flashes from fallback to web font
StudioFeixenSans-Semibo... woff2 swap
Size 19 KB
Load time 80 ms
Start 380 ms
Risk FOUT — text flashes from fallback to web font
StudioFeixenSansRegular... woff2 swap
Size 8 KB
Load time 26 ms
Start 573 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
101 requests over 2953ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 976 ms LCP 1.3 shttps://datacamp.com// https://datacamp.com/ — 301 — 240 B — 56 ms — h2https://www.datacamp.com/www.datacamp.com/ https://www.datacamp.com/ — 200 — 129.1 KiB — 340 ms — h2https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSansRegular-english-v2.woff2dcmfe.datacamp.com/assets/fonts/Stu... https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSansRegular-english-v2.woff2 — 200 — 19.2 KiB — 70 ms — h2https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSans-Semibold-english.woff2dcmfe.datacamp.com/assets/fonts/Stu... https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSans-Semibold-english.woff2 — 200 — 18.8 KiB — 80 ms — h2https://www.datacamp.com/_next/static/css/524465260040063c.csswww.datacamp.com/_next/static/css/5... https://www.datacamp.com/_next/static/css/524465260040063c.css — 200 — 1.3 KiB — 47 ms — h2https://www.datacamp.com/_next/static/chunks/59922-ca82e2055a0b9a33.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/59922-ca82e2055a0b9a33.js — 200 — 5.5 KiB — 58 ms — h2https://www.datacamp.com/_next/static/chunks/7798-2575efc464a9996d.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/7798-2575efc464a9996d.js — 200 — 1.1 KiB — 64 ms — h2https://www.datacamp.com/_next/static/chunks/47416-e2aefba008e9f696.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/47416-e2aefba008e9f696.js — 200 — 1.1 KiB — 55 ms — h2https://www.datacamp.com/_next/static/chunks/71900-11044b1fcc22ae9a.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/71900-11044b1fcc22ae9a.js — 200 — 1.0 KiB — 59 ms — h2https://www.datacamp.com/_next/static/chunks/63998-952e986f3af7d60d.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/63998-952e986f3af7d60d.js — 200 — 75.6 KiB — 117 ms — h2https://www.datacamp.com/_next/static/chunks/19292.251e7a88e14c7a13.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/19292.251e7a88e14c7a13.js — 200 — 2.8 KiB — 79 ms — h2https://www.datacamp.com/_next/static/chunks/85832.e33c238b73916a2b.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/85832.e33c238b73916a2b.js — 200 — 9.2 KiB — 87 ms — h2https://www.datacamp.com/_next/static/chunks/74001.8cb618053d42a883.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/74001.8cb618053d42a883.js — 200 — 11.9 KiB — 66 ms — h2https://www.datacamp.com/_next/static/chunks/86589.c2d18562d0900061.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/86589.c2d18562d0900061.js — 200 — 1.2 KiB — 75 ms — h2https://www.datacamp.com/_next/static/chunks/72815.978bf9cfc27095eb.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/72815.978bf9cfc27095eb.js — 200 — 2.7 KiB — 73 ms — h2https://www.datacamp.com/_next/static/chunks/8096.6b111d24c44adbac.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/8096.6b111d24c44adbac.js — 200 — 1.4 KiB — 66 ms — h2https://www.datacamp.com/_next/static/chunks/85028-b2d851d3d5d84199.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/85028-b2d851d3d5d84199.js — 200 — 2.3 KiB — 63 ms — h2https://www.datacamp.com/_next/static/chunks/63619.179a12bed81cbd31.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/63619.179a12bed81cbd31.js — 200 — 1.1 KiB — 89 ms — h2https://www.datacamp.com/_next/static/chunks/webpack-597685773c802e07.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/webpack-597685773c802e07.js — 200 — 16.9 KiB — 99 ms — h2https://www.datacamp.com/_next/static/chunks/framework-14a02dd5e036ebf0.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/framework-14a02dd5e036ebf0.js — 200 — 58.1 KiB — 106 ms — h2https://www.datacamp.com/_next/static/chunks/main-028a31fb8f3df20b.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/main-028a31fb8f3df20b.js — 200 — 36.5 KiB — 96 ms — h2https://www.datacamp.com/_next/static/chunks/pages/_app-f7e9c71fee037706.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/pages/_app-f7e9c71fee037706.js — 200 — 622.4 KiB — 136 ms — h2https://www.datacamp.com/_next/static/chunks/45981-39cfa9cd4b703f9f.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/45981-39cfa9cd4b703f9f.js — 200 — 21.9 KiB — 100 ms — h2https://www.datacamp.com/_next/static/chunks/53776-2a800a410e6e67ad.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/53776-2a800a410e6e67ad.js — 200 — 7.1 KiB — 92 ms — h2https://www.datacamp.com/_next/static/chunks/6943-8fa4afffd90dea16.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/6943-8fa4afffd90dea16.js — 200 — 3.7 KiB — 88 ms — h2https://www.datacamp.com/_next/static/chunks/46197-ad95baae7b5cafdc.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/46197-ad95baae7b5cafdc.js — 200 — 2.6 KiB — 89 ms — h2https://www.datacamp.com/_next/static/chunks/10648-dcd65c77d31f246e.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/10648-dcd65c77d31f246e.js — 200 — 1.4 KiB — 90 ms — h2https://www.datacamp.com/_next/static/chunks/85756-62745a2b54657720.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/85756-62745a2b54657720.js — 200 — 4.0 KiB — 76 ms — h2https://www.datacamp.com/_next/static/chunks/21809-cfb784d0373a0369.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/21809-cfb784d0373a0369.js — 200 — 19.9 KiB — 83 ms — h2https://www.datacamp.com/_next/static/chunks/15476-3abc79d3bd85c0c1.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/15476-3abc79d3bd85c0c1.js — 200 — 8.0 KiB — 106 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 976 ms LCP 1.3 shttps://datacamp.com// https://datacamp.com/ — 301 — 240 B — 56 ms — h2https://www.datacamp.com/www.datacamp.com/ https://www.datacamp.com/ — 200 — 129.1 KiB — 340 ms — h2https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSansRegular-english-v2.woff2dcmfe.datacamp.com/assets/fonts/Stu... https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSansRegular-english-v2.woff2 — 200 — 19.2 KiB — 70 ms — h2https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSans-Semibold-english.woff2dcmfe.datacamp.com/assets/fonts/Stu... https://dcmfe.datacamp.com/assets/fonts/StudioFeixenSans-Semibold-english.woff2 — 200 — 18.8 KiB — 80 ms — h2https://www.datacamp.com/_next/static/css/524465260040063c.csswww.datacamp.com/_next/static/css/5... https://www.datacamp.com/_next/static/css/524465260040063c.css — 200 — 1.3 KiB — 47 ms — h2https://www.datacamp.com/_next/static/chunks/59922-ca82e2055a0b9a33.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/59922-ca82e2055a0b9a33.js — 200 — 5.5 KiB — 58 ms — h2https://www.datacamp.com/_next/static/chunks/7798-2575efc464a9996d.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/7798-2575efc464a9996d.js — 200 — 1.1 KiB — 64 ms — h2https://www.datacamp.com/_next/static/chunks/47416-e2aefba008e9f696.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/47416-e2aefba008e9f696.js — 200 — 1.1 KiB — 55 ms — h2https://www.datacamp.com/_next/static/chunks/71900-11044b1fcc22ae9a.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/71900-11044b1fcc22ae9a.js — 200 — 1.0 KiB — 59 ms — h2https://www.datacamp.com/_next/static/chunks/63998-952e986f3af7d60d.jswww.datacamp.com/_next/static/chunk... https://www.datacamp.com/_next/static/chunks/63998-952e986f3af7d60d.js — 200 — 75.6 KiB — 117 ms — 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h2https://cdn.onesignal.com/sdks/OneSignalPageSDKES6.js?v=151607cdn.onesignal.com/sdks/OneSignalPag... https://cdn.onesignal.com/sdks/OneSignalPageSDKES6.js?v=151607 — 200 — 68.5 KiB — 67 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=15&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.datacamp.com%2F&scrsrc=www.googletagmanager.com&rnd=259322841.1776896040&navt=n&npa=1&ep.ads_data_redaction=0&gtm=45He64k0v76615339za200zd76615339xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938465~115938469~117266400~118463262&apve=1&apvf=f&apvc=1&tft=1776896040206&tfd=2475pagead2.googlesyndication.com/ccm/c... 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h3https://gsstm.datacamp.com/g/collect?v=2&tid=G-0VFSSYW4KG&gtm=45je64k0v9126843471z876615339za20gzb76615339zd76615339&_p=1776896039216&gcs=G100&gcd=13p3pPp2p7l1&npa=1&dma_cps=-&dma=1&ecid=1049125410&_eu=EAAAAEA&_fplc=0&_geo=1&_rdi=1&are=1&cid=789330561.1776896040&ec_mode=c&frm=0&ir=1&ngs=1&pscdl=denied&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&ur=ES-MD&sst.rnd=259322841.1776896040&sst.ngs=1&sst.etld=google.es&sst.gcsub=region1&sst.tft=1776896039216&sst.lpc=106190742&sst.navt=n&sst.ude=1&_s=1&tag_exp=0~115938465~115938468~117266401~117512542&dp=%2F&sid=1776896039&sct=1&seg=0&dl=https%3A%2F%2Fwww.datacamp.com%2F&dt=Learn%20Data%20Science%20and%20AI%20Online%20%7C%20DataCamp&_tu=BAg&en=page_view&_fv=1&_nsi=1&_ss=2&ep.dc_gtm_env=live&ep.content_group=Other&ep.event_id=1776896439763_17768967662833&ep.b2b_user=false&ep.page_hostname=www.datacamp.com&ep.consent_state=%7B%22ad_storage%22%3Afalse%2C%22analytics_storage%22%3Afalse%2C%22functionality_storage%22%3Afalse%2C%22personalization_storage%22%3Afalse%2C%22security_storage%22%3Atrue%2C%22ad_user_data%22%3Afalse%2C%22ad_personalization%22%3Afalse%7D&ep.cmp=datacamp&ep.page_view_type=page_load&ep.user_data._tag_mode=CODE&tfd=2493&richsstssegsstm.datacamp.com/g/collect?v=2&ti... https://gsstm.datacamp.com/g/collect?v=2&tid=G-0VFSSYW4KG&gtm=45je64k0v9126843471z876615339za20gzb76615339zd76615339&_p=1776896039216&gcs=G100&gcd=13p3pPp2p7l1&npa=1&dma_cps=-&dma=1&ecid=1049125410&_eu=EAAAAEA&_fplc=0&_geo=1&_rdi=1&are=1&cid=789330561.1776896040&ec_mode=c&frm=0&ir=1&ngs=1&pscdl=denied&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&ur=ES-MD&sst.rnd=259322841.1776896040&sst.ngs=1&sst.etld=google.es&sst.gcsub=region1&sst.tft=1776896039216&sst.lpc=106190742&sst.navt=n&sst.ude=1&_s=1&tag_exp=0~115938465~115938468~117266401~117512542&dp=%2F&sid=1776896039&sct=1&seg=0&dl=https%3A%2F%2Fwww.datacamp.com%2F&dt=Learn%20Data%20Science%20and%20AI%20Online%20%7C%20DataCamp&_tu=BAg&en=page_view&_fv=1&_nsi=1&_ss=2&ep.dc_gtm_env=live&ep.content_group=Other&ep.event_id=1776896439763_17768967662833&ep.b2b_user=false&ep.page_hostname=www.datacamp.com&ep.consent_state=%7B%22ad_storage%22%3Afalse%2C%22analytics_storage%22%3Afalse%2C%22functionality_storage%22%3Afalse%2C%22personalization_storage%22%3Afalse%2C%22security_storage%22%3Atrue%2C%22ad_user_data%22%3Afalse%2C%22ad_personalization%22%3Afalse%7D&ep.cmp=datacamp&ep.page_view_type=page_load&ep.user_data._tag_mode=CODE&tfd=2493&richsstsse 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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 1960ms · 1192KB · $26/mo
www.datacamp.com
Other
Costly
Execution 744ms
Transfer 129 KB
Monthly Cost $10/mo
www.datacamp.com
Other
Costly
Execution 507ms
Transfer 58 KB
Unused 51%
Monthly Cost $7/mo
www.datacamp.com
Other
Costly
Execution 252ms
Transfer 622 KB
Unused 34%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 171ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 146ms
Transfer 177 KB
Unused 34%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 167 KB
Unused 39%
Monthly Cost $1/mo
www.datacamp.com
Other
Optional
Execution 55ms
Transfer 39 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.datacamp.com adds 744ms and costs ~$10/month
  • www.datacamp.com adds 507ms and costs ~$7/month
  • www.datacamp.com adds 252ms 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

www.datacamp.com takes 744ms 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.datacamp.com takes 507ms 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

51% of www.datacamp.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

www.datacamp.com takes 252ms 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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