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https://freecodecamp.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
71
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.
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.

1.35 s

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

4.01 s

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

88 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.

2.13 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.

4.02 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
15
7 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 54 requests
FIX
2.9 MB transferred, 54 requests
Warning::
Page weighs 9.9 MB (2.9 MB transferred)
Warning::
JavaScript is 2.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.3 MB
Info::
Fonts are 203 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 203 KB
Info::
54 HTTP requests
Info::
Estimated 0.60 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
54 requests
0.60 g CO2 per page load
JavaScript 2.3 MiB 81%
Images 249.3 KiB 8%
Fonts 202.9 KiB 7%
HTML 77.0 KiB 3%
Other 7.1 KiB 0%
Other 4.3 KiB 0%
Other 3.5 KiB 0%
Other 1.1 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
17 scripts, 1.2 MB unused
FIX
17 scripts, 1.2 MB unused
Warning::
https://www.freecodecamp.org/c8f7fe3b0e41be846d568...: 725 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.freecodecamp.org/app-84a776ab9ab7915f4...: 143 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.stripe.com/v3: 143 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.freecodecamp.org/7e3b4c62-ba61f723d90a...: 78 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-SF1B...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.2 MB
1237 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.freecodecamp.org/c8f7fe3b0e41be846d5687592cf2018ff6e22687-40d71bcd1644bb1c5dce.js726 KB725 KB (100%)✓3rd
https://www.freecodecamp.org/app-84a776ab9ab7915f4ed2.js469 KB143 KB (31%)✓3rd
https://js.stripe.com/v3222 KB143 KB (65%)✓3rd
https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.js135 KB78 KB (60%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-SF1BGBDCNS&cx=c&gtm=4e64e1&bs=ctrl155 KB65 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-57R6KJM&gtm_auth=&gtm_preview=&gtm_cookies_win=x124 KB61 KB (50%)✓3rd
https://www.freecodecamp.org/component---src-pages-index-tsx-982dc98f48aac61a9135.js40 KB21 KB (53%)✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.freecodecamp.org/d82bff99d17dc59c45b6281a99a3ed0ccb6fc4cd-aed71431ef4b123bbb8f.js12 KB—✓3rd
https://js.stripe.com/v3/fingerprinted/js/shared-e-0b739d47d287f02f227d323a8d29312e.js184 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
54 resources · 2.9 MB · 1.2 MB savings available
FIX
54 resources · 2.9 MB · 1.2 MB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~1.2 MB of savings available
Warning::
53 third-party resources (100% of weight)
Info::
4 resources over 200KB
54 resources · 2.9 MiB · 53 third-party 1.9 MiB over 1MB target
JavaScript 81% · 2.3 MiB
Image 9% · 255.3 KiB
Font 7% · 202.9 KiB
Document 3% · 77.6 KiB
Other 0% · 9.4 KiB

~1.2 MiB of savings available

Remove unused JavaScript: 1.2 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
JS Execution Cost
740ms total JS execution
REVIEW
740ms total JS execution
Warning::
https://www.freecodecamp.org/app-84a776ab9ab7915f4...: 315ms CPU time
Info::
https://www.freecodecamp.org/: 135ms CPU time
Info::
Unattributable: 78ms CPU time
Info::
https://js.stripe.com/v3: 75ms CPU time
Info::
https://www.freecodecamp.org/c8f7fe3b0e41be846d568...: 74ms CPU time
Warning::
Third-party scripts: 740ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Script Parsing & Compilation 20% Other 14% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.freecodecamp.org/app-84a776ab9ab7915f4ed2.js315ms263ms31ms3rd
https://www.freecodecamp.org/135ms2ms1ms3rd
Unattributable78ms3ms0ms3rd
https://js.stripe.com/v375ms52ms21ms3rd
https://www.freecodecamp.org/c8f7fe3b0e41be846d5687592cf2018ff6e22687-40d71bcd1644bb1c5dce.js74ms2ms73ms3rd
https://www.googletagmanager.com/gtag/js?id=G-SF1BGBDCNS&cx=c&gtm=4e64e1&bs=ctrl64ms50ms13ms3rd
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+
Image Optimization
5 images, 0 KB saveable
PASS
5 images, 0 KB saveable
Info::
All images are well-optimized
5 images 249 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
7 fonts (203 KB)
PASS
7 fonts (203 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

203 KB total

Render-blocking

0

of 7

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 1.3 s LCP 4.0 shttps://www.freecodecamp.org/static/Lato-Regular-77ca2742388f408c3be7d0ec3e7dc392.woffLato-Regular-77ca274238... https://www.freecodecamp.org/static/Lato-Regular-77ca2742388f408c3be7d0ec3e7dc392.woff — 37.3 KiB — 46 ms — font-display: swaphttps://www.freecodecamp.org/static/Lato-Light-91308c0216b40aad16036f1394b98237.woffLato-Light-91308c0216b4... https://www.freecodecamp.org/static/Lato-Light-91308c0216b40aad16036f1394b98237.woff — 35.7 KiB — 40 ms — font-display: swaphttps://www.freecodecamp.org/static/Lato-Bold-ba3a83adcb94357fc42f762985e4d3df.woffLato-Bold-ba3a83adcb943... https://www.freecodecamp.org/static/Lato-Bold-ba3a83adcb94357fc42f762985e4d3df.woff — 36.5 KiB — 29 ms — font-display: swaphttps://www.freecodecamp.org/static/Hack-ZeroSlash-Regular-f67447de5dc6604f538786bd55ac6019.woffHack-ZeroSlash-Regular-... https://www.freecodecamp.org/static/Hack-ZeroSlash-Regular-f67447de5dc6604f538786bd55ac6019.woff — 29.3 KiB — 36 ms — font-display: swaphttps://www.freecodecamp.org/static/Hack-ZeroSlash-Bold-c8ea19a8461596cf1a6a2ad08bebcf8e.woffHack-ZeroSlash-Bold-c8e... https://www.freecodecamp.org/static/Hack-ZeroSlash-Bold-c8ea19a8461596cf1a6a2ad08bebcf8e.woff — 29.7 KiB — 38 ms — font-display: swaphttps://www.freecodecamp.org/static/Hack-ZeroSlash-Italic-678bc16b550480d5a3c5c76dbf8c5fb9.woffHack-ZeroSlash-Italic-6... https://www.freecodecamp.org/static/Hack-ZeroSlash-Italic-678bc16b550480d5a3c5c76dbf8c5fb9.woff — 34.3 KiB — 38 ms — font-display: swaphttps://www.freecodecamp.org/static/Lato-Bold-ba3a83adcb94357fc42f762985e4d3df.woffLato-Bold-ba3a83adcb943... https://www.freecodecamp.org/static/Lato-Bold-ba3a83adcb94357fc42f762985e4d3df.woff — 0 B — 29 ms — font-display: swap
Lato-Regular-77ca274238... woff swap
Size 37 KB
Load time 46 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Lato-Light-91308c0216b4... woff swap
Size 36 KB
Load time 40 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Lato-Bold-ba3a83adcb943... woff swap
Size 37 KB
Load time 29 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Hack-ZeroSlash-Regular-... woff swap
Size 29 KB
Load time 36 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Hack-ZeroSlash-Bold-c8e... woff swap
Size 30 KB
Load time 38 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Hack-ZeroSlash-Italic-6... woff swap
Size 34 KB
Load time 38 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Lato-Bold-ba3a83adcb943... woff swap
Size 0 KB
Load time 29 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~61 KB and ~122 ms

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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
54 requests over 3788ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.3 s LCP 4.0 shttps://freecodecamp.org// https://freecodecamp.org/ — 302 — 587 B — 137 ms — h3https://www.freecodecamp.org/www.freecodecamp.org/ https://www.freecodecamp.org/ — 200 — 73.0 KiB — 350 ms — h3https://www.freecodecamp.org/cdn-cgi/speculationwww.freecodecamp.org/cdn-cgi/specul... https://www.freecodecamp.org/cdn-cgi/speculation — 200 — 571 B — 19 ms — h3https://www.freecodecamp.org/webpack-runtime-d53fea60ba31bfbb8d33.jswww.freecodecamp.org/webpack-runtim... https://www.freecodecamp.org/webpack-runtime-d53fea60ba31bfbb8d33.js — 200 — 6.1 KiB — 31 ms — h3https://www.freecodecamp.org/6d879f80-f0604bf88a63c9343869.jswww.freecodecamp.org/6d879f80-f0604... https://www.freecodecamp.org/6d879f80-f0604bf88a63c9343869.js — 200 — 5.9 KiB — 31 ms — h3https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.jswww.freecodecamp.org/7e3b4c62-ba61f... https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.js — 200 — 135.2 KiB — 73 ms — h3https://www.freecodecamp.org/app-84a776ab9ab7915f4ed2.jswww.freecodecamp.org/app-84a776ab9a... https://www.freecodecamp.org/app-84a776ab9ab7915f4ed2.js — 200 — 469.1 KiB — 94 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 93 ms — h2https://www.freecodecamp.org/static/Lato-Regular-77ca2742388f408c3be7d0ec3e7dc392.woffwww.freecodecamp.org/static/Lato-Re... https://www.freecodecamp.org/static/Lato-Regular-77ca2742388f408c3be7d0ec3e7dc392.woff — 200 — 37.3 KiB — 46 ms — h3https://www.freecodecamp.org/manifest.webmanifestwww.freecodecamp.org/manifest.webma... https://www.freecodecamp.org/manifest.webmanifest — 200 — 1.1 KiB — 136 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-57R6KJM&gtm_auth=&gtm_preview=&gtm_cookies_win=xwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-57R6KJM&gtm_auth=&gtm_preview=&gtm_cookies_win=x — 200 — 123.9 KiB — 229 ms — h2https://js.stripe.com/v3js.stripe.com/v3 https://js.stripe.com/v3 — 200 — 221.6 KiB — 33 ms — h2https://www.freecodecamp.org/page-data/app-data.jsonwww.freecodecamp.org/page-data/app-... https://www.freecodecamp.org/page-data/app-data.json — 200 — 820 B — 123 ms — h3https://www.freecodecamp.org/page-data/index/page-data.jsonwww.freecodecamp.org/page-data/inde... https://www.freecodecamp.org/page-data/index/page-data.json — 200 — 895 B — 123 ms — h3https://js.stripe.com/v3/controller-with-preconnect-569ea8d932d8239cf4045c1566427323.htmljs.stripe.com/v3/controller-with-pr... https://js.stripe.com/v3/controller-with-preconnect-569ea8d932d8239cf4045c1566427323.html — 200 — 1.2 KiB — 6 ms — h2https://www.freecodecamp.org/d82bff99d17dc59c45b6281a99a3ed0ccb6fc4cd-aed71431ef4b123bbb8f.jswww.freecodecamp.org/d82bff99d17dc5... https://www.freecodecamp.org/d82bff99d17dc59c45b6281a99a3ed0ccb6fc4cd-aed71431ef4b123bbb8f.js — 200 — 11.7 KiB — 36 ms — h3https://www.freecodecamp.org/component---src-pages-index-tsx-982dc98f48aac61a9135.jswww.freecodecamp.org/component---sr... https://www.freecodecamp.org/component---src-pages-index-tsx-982dc98f48aac61a9135.js — 200 — 40.4 KiB — 38 ms — h3https://www.freecodecamp.org/page-data/sq/d/2177391967.jsonwww.freecodecamp.org/page-data/sq/d... https://www.freecodecamp.org/page-data/sq/d/2177391967.json — 200 — 824 B — 121 ms — h3https://js.stripe.com/v3/fingerprinted/js/shared-e-0b739d47d287f02f227d323a8d29312e.jsjs.stripe.com/v3/fingerprinted/js/s... https://js.stripe.com/v3/fingerprinted/js/shared-e-0b739d47d287f02f227d323a8d29312e.js — 200 — 184.3 KiB — 29 ms — h2https://js.stripe.com/v3/fingerprinted/js/controller-with-preconnect-e-7571cd0cb098838be8a89171684c198d.jsjs.stripe.com/v3/fingerprinted/js/c... https://js.stripe.com/v3/fingerprinted/js/controller-with-preconnect-e-7571cd0cb098838be8a89171684c198d.js — 200 — 265.7 KiB — 31 ms — h2https://www.googletagmanager.com/gtag/js?id=G-SF1BGBDCNS&cx=c&gtm=4e64e1&bs=ctrlwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-SF1BGBDCNS&cx=c&gtm=4e64e1&bs=ctrl — 200 — 155.2 KiB — 103 ms — h2https://api.freecodecamp.org/user/get-session-userapi.freecodecamp.org/user/get-sessi... https://api.freecodecamp.org/user/get-session-user — 200 — 0 B — 326 ms — h3https://gb.api.freecodecamp.org/api/features/sdk-szxzcLoVPQcu4WHgb.api.freecodecamp.org/api/feature... https://gb.api.freecodecamp.org/api/features/sdk-szxzcLoVPQcu4WH — 200 — 1.2 KiB — 356 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-SF1BGBDCNS&gtm=45je64e1v899906655z8898343016za20gzb898343016zd898343016&_p=1776295564668&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1307355122.1776295565&frm=0&pscdl=noapi&rcb=9&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~116363098~117266400&sid=1776295565&sct=1&seg=0&dl=https%3A%2F%2Fwww.freecodecamp.org%2F&dt=&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1115region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-SF1BGBDCNS&gtm=45je64e1v899906655z8898343016za20gzb898343016zd898343016&_p=1776295564668&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1307355122.1776295565&frm=0&pscdl=noapi&rcb=9&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~116363098~117266400&sid=1776295565&sct=1&seg=0&dl=https%3A%2F%2Fwww.freecodecamp.org%2F&dt=&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1115 — 204 — 553 B — 65 ms — h2https://js.stripe.com/v3/.deploy_status_henson.jsonjs.stripe.com/v3/.deploy_status_hen... https://js.stripe.com/v3/.deploy_status_henson.json — 200 — 606 B — 4 ms — h3https://js.stripe.com/v3/fingerprinted/js/stripe-cookies-e-98bad84caff67323b0b59cd14a344115.jsjs.stripe.com/v3/fingerprinted/js/s... https://js.stripe.com/v3/fingerprinted/js/stripe-cookies-e-98bad84caff67323b0b59cd14a344115.js — 200 — 13.9 KiB — 5 ms — h3https://js.stripe.com/v3/.deploy_status_henson.jsonjs.stripe.com/v3/.deploy_status_hen... https://js.stripe.com/v3/.deploy_status_henson.json — 200 — 0 B — 5 ms — h3https://r.stripe.com/br.stripe.com/b https://r.stripe.com/b — 200 — 212 B — 553 ms — h2https://www.freecodecamp.org/cdn-cgi/rum?www.freecodecamp.org/cdn-cgi/rum? https://www.freecodecamp.org/cdn-cgi/rum? — 204 — 487 B — 21 ms — h3https://www.freecodecamp.org/favicon-32x32.pngwww.freecodecamp.org/favicon-32x32.... https://www.freecodecamp.org/favicon-32x32.png — 200 — 1.5 KiB — 26 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.3 s LCP 4.0 shttps://freecodecamp.org// https://freecodecamp.org/ — 302 — 587 B — 137 ms — h3https://www.freecodecamp.org/www.freecodecamp.org/ https://www.freecodecamp.org/ — 200 — 73.0 KiB — 350 ms — h3https://www.freecodecamp.org/cdn-cgi/speculationwww.freecodecamp.org/cdn-cgi/specul... https://www.freecodecamp.org/cdn-cgi/speculation — 200 — 571 B — 19 ms — h3https://www.freecodecamp.org/webpack-runtime-d53fea60ba31bfbb8d33.jswww.freecodecamp.org/webpack-runtim... https://www.freecodecamp.org/webpack-runtime-d53fea60ba31bfbb8d33.js — 200 — 6.1 KiB — 31 ms — h3https://www.freecodecamp.org/6d879f80-f0604bf88a63c9343869.jswww.freecodecamp.org/6d879f80-f0604... https://www.freecodecamp.org/6d879f80-f0604bf88a63c9343869.js — 200 — 5.9 KiB — 31 ms — h3https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.jswww.freecodecamp.org/7e3b4c62-ba61f... https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.js — 200 — 135.2 KiB — 73 ms — 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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 740ms · 1645KB · $2/mo
www.freecodecamp.org
Other
Costly
Execution 315ms
Transfer 469 KB
Unused 31%
Monthly Cost $1/mo
www.freecodecamp.org
Other
Optional
Execution 135ms
Transfer 73 KB
Monthly Cost $0/mo
Unattributable
Other
Optional
Execution 78ms
Transfer 0 KB
Monthly Cost $0/mo
Stripe
Payment
Essential
Execution 75ms
Transfer 222 KB
Unused 65%
Monthly Cost $0/mo
www.freecodecamp.org
Other
Optional
Execution 74ms
Transfer 726 KB
Unused 100%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 155 KB
Unused 42%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.freecodecamp.org adds 315ms and costs ~$1/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.freecodecamp.org takes 315ms 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

65% of Stripe'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

100% of www.freecodecamp.org'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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