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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
6
REVIEW
0
PASS
9
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

4.83 s

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

18.27 s

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

874 ms

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

0.047

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

5.66 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.

18.68 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
9 PASS 6 FIX
F
Page Weight Budget
Action
2.7 MB transferred, 52 requests
FIX
2.7 MB transferred, 52 requests
Warning::
Page weighs 9.8 MB (2.7 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::
52 HTTP requests
Info::
Estimated 0.57 g CO2 per page load
2.7 MB / 2.4 MB budget
2.7 MB transferred
52 requests
0.57 g CO2 per page load
JavaScript 2.3 MiB 86%
Fonts 202.9 KiB 7%
Images 90.2 KiB 3%
HTML 77.3 KiB 3%
Other 7.6 KiB 0%
Other 4.9 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 (2.7 MiB of 2.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2978ms total JS execution
FIX
2978ms total JS execution
Warning::
https://www.freecodecamp.org/app-84a776ab9ab7915f4...: 1197ms CPU time
Warning::
https://www.freecodecamp.org/: 494ms CPU time
Warning::
https://js.stripe.com/v3: 279ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-SF1B...: 277ms CPU time
Warning::
Unattributable: 274ms CPU time
Warning::
Third-party scripts: 2978ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Script Parsing & Compilation 19% Other 14% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.freecodecamp.org/app-84a776ab9ab7915f4ed2.js1197ms1006ms123ms3rd
https://www.freecodecamp.org/494ms7ms3ms3rd
https://js.stripe.com/v3279ms196ms78ms3rd
https://www.googletagmanager.com/gtag/js?id=G-SF1BGBDCNS&cx=c&gtm=4e64e1h1&bs=ctrl2277ms240ms35ms3rd
Unattributable274ms10ms0ms3rd
https://www.freecodecamp.org/c8f7fe3b0e41be846d5687592cf2018ff6e22687-40d71bcd1644bb1c5dce.js245ms7ms238ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-57R6KJM&gtm_auth=&gtm_preview=&gtm_cookies_win=x154ms123ms30ms3rd
https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.js59ms1ms54ms3rd
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://js.stripe.com/v3: 144 KB unused (65%)
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://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
1238 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.freecodecamp.org/c8f7fe3b0e41be846d5687592cf2018ff6e22687-40d71bcd1644bb1c5dce.js726 KB725 KB (100%)✓3rd
https://js.stripe.com/v3222 KB144 KB (65%)✓3rd
https://www.freecodecamp.org/app-84a776ab9ab7915f4ed2.js469 KB143 KB (31%)✓3rd
https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.js135 KB78 KB (60%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-SF1BGBDCNS&cx=c&gtm=4e64e1h1&bs=ctrl2155 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
52 resources · 2.7 MB · 1.2 MB savings available
FIX
52 resources · 2.7 MB · 1.2 MB savings available
Warning::
Page weight 1.7 MB over 1MB target
Got: 2.7 MB Expected: ≤ 1 MB
Info::
~1.2 MB of savings available
Warning::
51 third-party resources (100% of weight)
Info::
4 resources over 200KB
52 resources · 2.7 MiB · 51 third-party 1.7 MiB over 1MB target
JavaScript 86% · 2.3 MiB
Font 7% · 202.9 KiB
Image 3% · 96.2 KiB
Document 3% · 78.5 KiB
Other 0% · 10.0 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.

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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 90 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 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 FCP 4.8 s LCP 18.3 shttps://www.freecodecamp.org/static/Lato-Regular-77ca2742388f408c3be7d0ec3e7dc392.woffLato-Regular-77ca274238... https://www.freecodecamp.org/static/Lato-Regular-77ca2742388f408c3be7d0ec3e7dc392.woff — 37.3 KiB — 86 ms — font-display: swaphttps://www.freecodecamp.org/static/Lato-Light-91308c0216b40aad16036f1394b98237.woffLato-Light-91308c0216b4... https://www.freecodecamp.org/static/Lato-Light-91308c0216b40aad16036f1394b98237.woff — 35.0 KiB — 30 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 — 29.9 KiB — 34 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 — 33 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 — 34 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 — 26 ms — font-display: swap
Lato-Regular-77ca274238... woff swap
Size 37 KB
Load time 86 ms
Start 544 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Lato-Light-91308c0216b4... woff swap
Size 35 KB
Load time 30 ms
Start 1.9 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 1.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Hack-ZeroSlash-Regular-... woff swap
Size 30 KB
Load time 34 ms
Start 1.9 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 33 ms
Start 1.9 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 34 ms
Start 1.9 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 26 ms
Start 1.9 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+
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
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
52 requests over 3941ms
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 FCP 4.8 s LCP 18.3 shttps://freecodecamp.org// https://freecodecamp.org/ — 302 — 1.2 KiB — 158 ms — h2https://www.freecodecamp.org/www.freecodecamp.org/ https://www.freecodecamp.org/ — 200 — 73.3 KiB — 352 ms — h2https://www.freecodecamp.org/cdn-cgi/speculationwww.freecodecamp.org/cdn-cgi/specul... https://www.freecodecamp.org/cdn-cgi/speculation — 200 — 457 B — 20 ms — h2https://www.freecodecamp.org/webpack-runtime-d53fea60ba31bfbb8d33.jswww.freecodecamp.org/webpack-runtim... https://www.freecodecamp.org/webpack-runtime-d53fea60ba31bfbb8d33.js — 200 — 6.2 KiB — 34 ms — h3https://www.freecodecamp.org/6d879f80-f0604bf88a63c9343869.jswww.freecodecamp.org/6d879f80-f0604... https://www.freecodecamp.org/6d879f80-f0604bf88a63c9343869.js — 200 — 5.9 KiB — 62 ms — h3https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.jswww.freecodecamp.org/7e3b4c62-ba61f... https://www.freecodecamp.org/7e3b4c62-ba61f723d90acd3f2bee.js — 200 — 135.2 KiB — 124 ms — h3https://www.freecodecamp.org/app-84a776ab9ab7915f4ed2.jswww.freecodecamp.org/app-84a776ab9a... https://www.freecodecamp.org/app-84a776ab9ab7915f4ed2.js — 200 — 469.2 KiB — 143 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 83 ms — h2https://www.freecodecamp.org/manifest.webmanifestwww.freecodecamp.org/manifest.webma... https://www.freecodecamp.org/manifest.webmanifest — 200 — 1.1 KiB — 134 ms — h3https://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 — 86 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 — 257 ms — h2https://js.stripe.com/v3js.stripe.com/v3 https://js.stripe.com/v3 — 200 — 221.6 KiB — 60 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 — 821 B — 110 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 — 893 B — 110 ms — h3https://www.freecodecamp.org/d82bff99d17dc59c45b6281a99a3ed0ccb6fc4cd-aed71431ef4b123bbb8f.jswww.freecodecamp.org/d82bff99d17dc5... https://www.freecodecamp.org/d82bff99d17dc59c45b6281a99a3ed0ccb6fc4cd-aed71431ef4b123bbb8f.js — 200 — 11.8 KiB — 26 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 — 29 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 — 830 B — 113 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://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 — 15 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 — 19 ms — h2https://www.googletagmanager.com/gtag/js?id=G-SF1BGBDCNS&cx=c&gtm=4e64e1h1&bs=ctrl2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-SF1BGBDCNS&cx=c&gtm=4e64e1h1&bs=ctrl2 — 200 — 155.2 KiB — 106 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 — 356 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 — 1.9 KiB — 279 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 — 606 B — 5 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 — 7 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 — 6 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-SF1BGBDCNS&gtm=45je64e1h1v899906655z8898343016za20gzb898343016zd898343016&_p=1776295548017&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1712560583.1776295548&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~118289195&sid=1776295548&sct=1&seg=0&dl=https%3A%2F%2Fwww.freecodecamp.org%2F&dt=&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1232region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-SF1BGBDCNS&gtm=45je64e1h1v899906655z8898343016za20gzb898343016zd898343016&_p=1776295548017&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1712560583.1776295548&frm=0&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~118289195&sid=1776295548&sct=1&seg=0&dl=https%3A%2F%2Fwww.freecodecamp.org%2F&dt=&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1232 — 204 — 553 B — 65 ms — h2https://www.freecodecamp.org/cdn-cgi/rum?www.freecodecamp.org/cdn-cgi/rum? https://www.freecodecamp.org/cdn-cgi/rum? — 204 — 490 B — 20 ms — h3https://r.stripe.com/br.stripe.com/b https://r.stripe.com/b — 200 — 212 B — 551 ms — h2https://www.freecodecamp.org/favicon-32x32.pngwww.freecodecamp.org/favicon-32x32.... https://www.freecodecamp.org/favicon-32x32.png — 200 — 1.5 KiB — 25 ms — h3
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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 2978ms · 1905KB · $10/mo
www.freecodecamp.org
Other
Costly
Execution 1197ms
Transfer 469 KB
Unused 31%
Monthly Cost $4/mo
www.freecodecamp.org
Other
Costly
Execution 494ms
Transfer 73 KB
Monthly Cost $2/mo
Stripe
Payment
Essential
Execution 279ms
Transfer 222 KB
Unused 65%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Costly
Execution 277ms
Transfer 155 KB
Unused 42%
Monthly Cost $1/mo
Unattributable
Other
Costly
Execution 274ms
Transfer 0 KB
Monthly Cost $1/mo
www.freecodecamp.org
Other
Costly
Execution 245ms
Transfer 726 KB
Unused 100%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 154ms
Transfer 124 KB
Unused 50%
Monthly Cost $0/mo
www.freecodecamp.org
Other
Optional
Execution 59ms
Transfer 135 KB
Unused 60%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.freecodecamp.org adds 1197ms and costs ~$4/month
  • www.freecodecamp.org adds 494ms and costs ~$2/month
  • Google Tag Manager adds 277ms and costs ~$1/month
  • Unattributable adds 274ms and costs ~$1/month
  • www.freecodecamp.org adds 245ms 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 1197ms 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.freecodecamp.org takes 494ms 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

Google Tag Manager takes 277ms 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 274ms 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.freecodecamp.org takes 245ms 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

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

60% 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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