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https://howstuffworks.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

5.40 s

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

7.45 s

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

990 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.

5.40 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.

10.94 s

Page Load Progression

378 ms
756 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Checks
17
8 PASS 3 REVIEW 4 FIX
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 (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3643ms total JS execution
FIX
3643ms total JS execution
Warning::
https://5474cb65a01c.607c33ca.eu-west-1.token.awsw...: 783ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202601.2...: 700ms CPU time
Warning::
https://ob.greencolumnblog.com/i/d57f74026e211bf94...: 605ms CPU time
Warning::
Unattributable: 520ms CPU time
Warning::
https://www.howstuffworks.com/: 508ms CPU time
Warning::
Third-party scripts: 3643ms (100% of total)

Main Thread Breakdown

Script Evaluation 66% Other 18% Script Parsing & Compilation 6% Style & Layout 4%
ScriptTotalScriptingParse/CompileParty
https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/challenge.js783ms599ms111ms3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otGPP.js700ms645ms11ms3rd
https://ob.greencolumnblog.com/i/d57f74026e211bf94d3792e9f19dc289.js605ms510ms13ms3rd
Unattributable520ms125ms0ms3rd
https://www.howstuffworks.com/508ms169ms31ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.0.min.js150ms116ms8ms3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js142ms73ms45ms3rd
https://cdn-assets.hswstatic.com/lite/3245/js/vendor/alpine.v3.min.js132ms81ms4ms3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js103ms90ms3ms3rd
D
JS Bundles
Action
9 scripts, 350 KB unused
FIX
9 scripts, 350 KB unused
Warning::
https://5474cb65a01c.607c33ca.eu-west-1.token.awsw...: 278 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202601.2...: 73 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 350 KB
350 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/challenge.js501 KB278 KB (55%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js128 KB73 KB (57%)✓3rd
https://ob.greencolumnblog.com/i/d57f74026e211bf94d3792e9f19dc289.js45 KB—✓3rd
https://cdn-assets.hswstatic.com/lite/3245/js/vendor/alpine.v3.min.js12 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 KB—✓3rd
https://js-agent.newrelic.com/nr-spa-1.313.0.min.js30 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otTCF.js18 KB—✓3rd
blob:https://www.howstuffworks.com/3ed2df04-fd7e-4a35-82d5-09e59736c1f5-0 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otGPP.js22 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

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
Page Weight Budget
1.1 MB transferred, 42 requests
REVIEW
1.1 MB transferred, 42 requests
Info::
Page weighs 3.7 MB (1.1 MB transferred)
Warning::
JavaScript is 765 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 765 KB
Info::
42 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
42 requests
0.22 g CO2 per page load
JavaScript 765.5 KiB 70%
Other 142.5 KiB 13%
HTML 71.6 KiB 7%
Fonts 54.7 KiB 5%
Images 40.4 KiB 4%
Other 12.7 KiB 1%
Other 1.5 KiB 0%
Other 404 B 0%
0 2.4 MB 4.9 MB
Under 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

B
Page Weight Inventory
42 resources · 1.1 MB · 350 KB savings available
REVIEW
42 resources · 1.1 MB · 350 KB savings available
Warning::
Page weight 65 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~350 KB of savings available
Warning::
41 third-party resources (100% of weight)
Info::
1 resources over 200KB
42 resources · 1.1 MiB · 41 third-party 65.3 KiB over 1MB target
JavaScript 70% · 765.5 KiB
Other 13% · 144.2 KiB
Document 7% · 77.3 KiB
Font 5% · 54.7 KiB
Image 4% · 42.9 KiB
CSS 0% · 4.7 KiB

~350.3 KiB of savings available

Remove unused JavaScript: 350.3 KiB
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
Image Optimization
5 images, 0 KB saveable
PASS
5 images, 0 KB saveable
Info::
All images are well-optimized
5 images 40 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (55 KB)
PASS
3 fonts (55 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

55 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 5.4 s LCP 7.5 shttps://cdn.hswstatic.com/fonts/roboto-v20-latin-regular.woff2roboto-v20-latin-regula... https://cdn.hswstatic.com/fonts/roboto-v20-latin-regular.woff2 — 15.9 KiB — 54 ms — font-display: swaphttps://cdn.hswstatic.com/fonts/roboto-v20-latin-700.woff2roboto-v20-latin-700.woff2 https://cdn.hswstatic.com/fonts/roboto-v20-latin-700.woff2 — 15.9 KiB — 53 ms — font-display: swaphttps://cdn.hswstatic.com/fonts/lato-v17-latin-700.woff2lato-v17-latin-700.woff2 https://cdn.hswstatic.com/fonts/lato-v17-latin-700.woff2 — 22.9 KiB — 56 ms — font-display: swap
roboto-v20-latin-regula... woff2 swap
Size 16 KB
Load time 54 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-700.woff2 woff2 swap
Size 16 KB
Load time 53 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
lato-v17-latin-700.woff2 woff2 swap
Size 23 KB
Load time 56 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
42 requests over 5603ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 5.4 s LCP 7.5 shttps://howstuffworks.com// https://howstuffworks.com/ — 301 — 243 B — 14 ms — h2https://www.howstuffworks.com/www.howstuffworks.com/ https://www.howstuffworks.com/ — 202 — 2.3 KiB — 10 ms — h2https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/challenge.js5474cb65a01c.607c33ca.eu-west-1.tok... https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/challenge.js — 200 — 501.5 KiB — 378 ms — h2https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/inputs?client=browser5474cb65a01c.607c33ca.eu-west-1.tok... https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/inputs?client=browser — 200 — 829 B — 123 ms — h3https://www.howstuffworks.com/favicon.icowww.howstuffworks.com/favicon.ico https://www.howstuffworks.com/favicon.ico — 202 — 402 B — 4 ms — h2https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/mp_verify5474cb65a01c.607c33ca.eu-west-1.tok... https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/mp_verify — 200 — 641 B — 84 ms — h3https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/mp_verify5474cb65a01c.607c33ca.eu-west-1.tok... https://5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com/5474cb65a01c/4af37e2f20eb/3645d47b931c/mp_verify — 200 — 643 B — 76 ms — h3https://www.howstuffworks.com/www.howstuffworks.com/ https://www.howstuffworks.com/ — 200 — 69.3 KiB — 1.2 s — h2https://ob.greencolumnblog.com/i/d57f74026e211bf94d3792e9f19dc289.jsob.greencolumnblog.com/i/d57f74026e... https://ob.greencolumnblog.com/i/d57f74026e211bf94d3792e9f19dc289.js — 200 — 44.6 KiB — 41 ms — h2https://cdn.hswstatic.com/fonts/roboto-v20-latin-regular.woff2cdn.hswstatic.com/fonts/roboto-v20-... https://cdn.hswstatic.com/fonts/roboto-v20-latin-regular.woff2 — 200 — 15.9 KiB — 54 ms — h2https://cdn.hswstatic.com/fonts/roboto-v20-latin-700.woff2cdn.hswstatic.com/fonts/roboto-v20-... https://cdn.hswstatic.com/fonts/roboto-v20-latin-700.woff2 — 200 — 15.9 KiB — 53 ms — h2https://cdn.hswstatic.com/fonts/lato-v17-latin-700.woff2cdn.hswstatic.com/fonts/lato-v17-la... https://cdn.hswstatic.com/fonts/lato-v17-latin-700.woff2 — 200 — 22.9 KiB — 56 ms — h2https://media.hswstatic.com/eyJidWNrZXQiOiJjb250ZW50Lmhzd3N0YXRpYy5jb20iLCJrZXkiOiJnaWZcL3NodXR0ZXJzdG9jay0yMDkxMzg2MzIwLmpwZyIsImVkaXRzIjp7InJlc2l6ZSI6eyJ3aWR0aCI6NDIwfSwidG9Gb3JtYXQiOiJhdmlmIn19media.hswstatic.com/eyJidWNrZXQiOiJ... https://media.hswstatic.com/eyJidWNrZXQiOiJjb250ZW50Lmhzd3N0YXRpYy5jb20iLCJrZXkiOiJnaWZcL3NodXR0ZXJzdG9jay0yMDkxMzg2MzIwLmpwZyIsImVkaXRzIjp7InJlc2l6ZSI6eyJ3aWR0aCI6NDIwfSwidG9Gb3JtYXQiOiJhdmlmIn19 — 200 — 20.0 KiB — 60 ms — h2https://cdn-assets.hswstatic.com/lite/3245/js/vendor/alpine.v3.min.jscdn-assets.hswstatic.com/lite/3245/... https://cdn-assets.hswstatic.com/lite/3245/js/vendor/alpine.v3.min.js — 200 — 11.6 KiB — 46 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 95 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAJCAQAAACRI2S5AAAAEElEQVR42mNkIAAYRxWAAQAG9gAKq…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAJCAQAAACRI2S5AAAAEElEQVR42mNkIAAYRxWAAQAG9gAKq… — 200 — 0 B — 0 ms — datahttps://cdn.hswstatic.com/en-us/hsw/img/hsw-avatar-sm.pngcdn.hswstatic.com/en-us/hsw/img/hsw... https://cdn.hswstatic.com/en-us/hsw/img/hsw-avatar-sm.png — 200 — 2.2 KiB — 8 ms — h2https://obs.greencolumnblog.com/ctobs.greencolumnblog.com/ct https://obs.greencolumnblog.com/ct — 200 — 2.0 KiB — 349 ms — h2https://www.howstuffworks.com/export/async-footer?nlPopup=0&nlFooter=1&locale=en-uswww.howstuffworks.com/export/async-... https://www.howstuffworks.com/export/async-footer?nlPopup=0&nlFooter=1&locale=en-us — 200 — 4.9 KiB — 35 ms — h2https://www.howstuffworks.com/manifest.jsonwww.howstuffworks.com/manifest.json https://www.howstuffworks.com/manifest.json — 202 — 404 B — 21 ms — h2https://media.hswstatic.com/eyJidWNrZXQiOiJjb250ZW50Lmhzd3N0YXRpYy5jb20iLCJrZXkiOiJnaWZcL3NodXR0ZXJzdG9jay0yMDI4MDk4NjgxLmpwZyIsImVkaXRzIjp7InJlc2l6ZSI6eyJ3aWR0aCI6NDIwfSwidG9Gb3JtYXQiOiJhdmlmIn19media.hswstatic.com/eyJidWNrZXQiOiJ... https://media.hswstatic.com/eyJidWNrZXQiOiJjb250ZW50Lmhzd3N0YXRpYy5jb20iLCJrZXkiOiJnaWZcL3NodXR0ZXJzdG9jay0yMDI4MDk4NjgxLmpwZyIsImVkaXRzIjp7InJlc2l6ZSI6eyJ3aWR0aCI6NDIwfSwidG9Gb3JtYXQiOiJhdmlmIn19 — 200 — 18.1 KiB — 6 ms — h2https://cdn.cookielaw.org/consent/17ee457c-e9a3-4e66-9b99-3c9e77442704/17ee457c-e9a3-4e66-9b99-3c9e77442704.jsoncdn.cookielaw.org/consent/17ee457c-... https://cdn.cookielaw.org/consent/17ee457c-e9a3-4e66-9b99-3c9e77442704/17ee457c-e9a3-4e66-9b99-3c9e77442704.json — 200 — 3.1 KiB — 84 ms — h2https://js-agent.newrelic.com/nr-spa-1.313.0.min.jsjs-agent.newrelic.com/nr-spa-1.313.... https://js-agent.newrelic.com/nr-spa-1.313.0.min.js — 200 — 30.3 KiB — 16 ms — h2https://cdn.hswstatic.com/en-us/hsw/img/icons/favicon.svgcdn.hswstatic.com/en-us/hsw/img/ico... https://cdn.hswstatic.com/en-us/hsw/img/icons/favicon.svg — 200 — 876 B — 6 ms — h2https://bam.nr-data.net/1/NRJS-1a55c79a27a4c4c26fa?a=688259707&v=1.313.0&to=YFADZ0RZDEAFAkIMDlkaIFBCUQ1dSwJZCxVSWxUeXlcPVg%3D%3D&rst=1407&ck=0&s=71681e82dcde5a05&ref=https://www.howstuffworks.com/&ptid=2f99ac38f5ff0557&af=err,spa,xhr,stn,ins&ap=752&be=1092&fe=271&dc=249&at=TBcUEQxDHx9GABRfGkpI&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776798850098,%22n%22:0,%22u%22:1097,%22ue%22:1097,%22f%22:2,%22dn%22:2,%22dne%22:2,%22c%22:2,%22s%22:2,%22ce%22:2,%22rq%22:3,%22rp%22:1092,%22rpe%22:1169,%22di%22:1322,%22ds%22:1339,%22de%22:1341,%22dc%22:1361,%22l%22:1361,%22le%22:1363%7D,%22navigation%22:%7B%22ty%22:1%7D%7D&fp=1248&fcp=1248bam.nr-data.net/1/NRJS-1a55c79a27a4... https://bam.nr-data.net/1/NRJS-1a55c79a27a4c4c26fa?a=688259707&v=1.313.0&to=YFADZ0RZDEAFAkIMDlkaIFBCUQ1dSwJZCxVSWxUeXlcPVg%3D%3D&rst=1407&ck=0&s=71681e82dcde5a05&ref=https://www.howstuffworks.com/&ptid=2f99ac38f5ff0557&af=err,spa,xhr,stn,ins&ap=752&be=1092&fe=271&dc=249&at=TBcUEQxDHx9GABRfGkpI&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776798850098,%22n%22:0,%22u%22:1097,%22ue%22:1097,%22f%22:2,%22dn%22:2,%22dne%22:2,%22c%22:2,%22s%22:2,%22ce%22:2,%22rq%22:3,%22rp%22:1092,%22rpe%22:1169,%22di%22:1322,%22ds%22:1339,%22de%22:1341,%22dc%22:1361,%22l%22:1361,%22le%22:1363%7D,%22navigation%22:%7B%22ty%22:1%7D%7D&fp=1248&fcp=1248 — 200 — 738 B — 234 ms — http/1.1https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 303 B — 124 ms — h2https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/2... 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https://obs.greencolumnblog.com/tracker/tc_imp.gif?e=37dfbd8ee84e00126de8c03ce24f8f9c9225c24f567d43d6da1908be6245cad7bd70a976750ef80ed89373bfe70e9c20c1e53e8d57168c6c2417070100b1eabfd72e30d69183042d3e12e26a3241de6fcd68d50d63032a9004085a66560994b7634662f462e36cd941a39669f8503bf85f2c2e03c641b506ec9dc5dd3db1290dfb7f94a85f3cdc043149714499d60864f572afecd6e34d4bb7498fb739e221da69c542991765ed7847a843135a68d9433cdb80f6ad3bb32cf203c213e3560d2ae7927f722b0b07d127d6c44de00534f383ec7d09253281966e7fccd51e0e3246710509be973c113d47f8af2e2cded0ac6a8fe55875032fadb6bdefe013c3a1c24ab70fc70d2e1598bbc1eaef24e384a034ca6611d0fdce321808f77f6fb8ed4b36b784ae64ec57a917f0dd07c74cccd17cc22a2984db7299779ac0b9f3dabde21f7fff2ce7eea97c5966bc866197e614e24d4600d45c0cd6d8d6cc81b2c53ccf6a88cfe6db23a03c6c248a3873d49e875835c1b03ee614f286019c7aba6c545c50c823b21dd5d6e27eb588758752a789db9b3fde17047dfa5d055e72092694fe31e6179a8c8664fdde42ccd0629a82a9a62ec1f0f05c2626dfa71e54dcb30e4a12f3fca26cb662deae1cacea31ad3be7768b0b8b5394ec79914c60bbecc925216c3f5e35194005f9b99e66c05af4025c5f3ba6e50986cf4948a7e781a8b67e80fff8eed1a9dcad121a62bf3ed2a4537c9e51790981312e2d35a325eb0f4dd0e1d37e987cc567d7b926a6b90d997b0f3d21027c139fdce5db3c7b5186194595d3dfa7b1ca530596acbc7d96cd7b67d9d2123f69e590d95622b53b845f9f19e5239a12dbcb1be4bb32e29f8fce9b5b7fece73c7f9f75ae8bacb615946b280b0395695f4db2a55b93f117cc9987d552cd87ea2f1c6302e769b90fb854ac806e913444284932787eff2f8ee46e0ff0369dfeb4758a8b15d63d61b3033f69c6bcc30048ef6ff48917dc00380842b93a32f7cb8822902643dfde52d48ed8a2fe17c841476650ab2337588e91125dbd3be1f9c82587d6ed101508e03b427607b45625b4faaf5f6bd9706dc1d5c717dbded1a24530f874e2156056d05c772e9181781ed887a78fbdec71b46dff318b37cb8e1ed6b9ad6925e58740c29ebeaed6b38b9c26488dfa3715c66ad018975fe1e42ba8d3df952cf094dff8e75424d7b2b7ec49c0489a0d5531472ad89a3836dc65ea41c7d575fe553ae86d42dc69e5db6d7ea47b6240068efed92b87dc583e6b05688999cfb0cc6dca49a7be6a6d8488040c195d7b6b7cba74a1f13045a1e4a287bbe1e5f9fedd22f084d44b68221e3606722402d75b4514e7f4b8a620b1df6050dbc81bf0c2469fc29c97cbb1e500f6539c1da97ff1c4addcc06373d9c8c8fb302d5b2586d9caa57d10f5c60f3e4dff7fbe632c4caf18a333d1463d905241cf9bbbbe9599c5e1c923c1068f876992a6e58423afccef2704c5d6de7db470e096de5f62828f269e843620f34058bb1a5a364570acd56445ed4c297861c92fccd1e36e4aa3324b0425d6faecab2f8b027e65b8adb1dd8879e1463a6f5d4370cc26706fb43342ef8f896e646807&cri=O6CdM4b31W&ts=372&cb=1776798851783 — 200 — 79 B — 103 ms — h2blob:https://www.howstuffworks.com/3ed2df04-fd7e-4a35-82d5-09e59736c1f5www.howstuffworks.com/3ed2df04-fd7e... blob:https://www.howstuffworks.com/3ed2df04-fd7e-4a35-82d5-09e59736c1f5 — 200 — -1 B — 34 ms — blobhttps://cdn.cookielaw.org/scripttemplates/202601.2.0/otGPP.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202601.2.0/otGPP.js — 200 — 22.3 KiB — 32 ms — h2https://cdn.cookielaw.org/scripttemplates/202601.2.0/assets/otFlat.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202601.2.0/assets/otFlat.json — 200 — 3.4 KiB — 29 ms — h2https://cdn.cookielaw.org/scripttemplates/202601.2.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202601.2.0/assets/otCommonStyles.css — 200 — 4.7 KiB — 30 ms — h2https://obs.greencolumnblog.com/monobs.greencolumnblog.com/mon https://obs.greencolumnblog.com/mon — 200 — 41 B — 106 ms — h2https://obs.greencolumnblog.com/monobs.greencolumnblog.com/mon https://obs.greencolumnblog.com/mon — 200 — 16 B — 104 ms — h2https://obs.greencolumnblog.com/monobs.greencolumnblog.com/mon https://obs.greencolumnblog.com/mon — 200 — 39 B — 103 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3643ms · 817KB · $48/mo
5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com
Other
Costly
Execution 783ms
Transfer 501 KB
Unused 55%
Monthly Cost $10/mo
OneTrust
Consent
Essential
Execution 700ms
Transfer 22 KB
Monthly Cost $9/mo
ob.greencolumnblog.com
Other
Costly
Execution 605ms
Transfer 45 KB
Monthly Cost $8/mo
Unattributable
Other
Costly
Execution 520ms
Transfer 0 KB
Monthly Cost $7/mo
www.howstuffworks.com
Other
Costly
Execution 508ms
Transfer 69 KB
Monthly Cost $7/mo
js-agent.newrelic.com
Other
Optional
Execution 150ms
Transfer 30 KB
Monthly Cost $2/mo
OneTrust
Consent
Essential
Execution 142ms
Transfer 128 KB
Unused 57%
Monthly Cost $2/mo
cdn-assets.hswstatic.com
Other
Optional
Execution 132ms
Transfer 12 KB
Monthly Cost $2/mo
OneTrust
Consent
Essential
Execution 103ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • 5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com adds 783ms and costs ~$10/month
  • ob.greencolumnblog.com adds 605ms and costs ~$8/month
  • Unattributable adds 520ms and costs ~$7/month
  • www.howstuffworks.com adds 508ms and costs ~$7/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

5474cb65a01c.607c33ca.eu-west-1.token.awswaf.com takes 783ms 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

55% of 5474cb65a01c.607c33ca.eu-west-1.token.awswaf.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

ob.greencolumnblog.com takes 605ms 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 520ms 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.howstuffworks.com takes 508ms 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

57% 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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