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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
4
PASS
7
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.
73
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

3.55 s

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

11.68 s

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

263 ms

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

0.394

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

5.33 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.

12.14 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
7 PASS 4 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
7 scripts, 622 KB unused
FIX
7 scripts, 622 KB unused
Warning::
https://s.gr-assets.com/assets/react_client_side/e...: 500 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.gr-assets.com/assets/react_client_side/s...: 65 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.gr-assets.com/assets/mobile/goodreads_mo...: 57 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 622 KB
622 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://s.gr-assets.com/assets/react_client_side/external_dependencies-ebf499aa1f.js604 KB500 KB (83%)✓3rd
https://s.gr-assets.com/assets/react_client_side/site_header-fbcaecc757.js139 KB65 KB (47%)✓3rd
https://s.gr-assets.com/assets/mobile/goodreads_mobile-ae2234ad982e29a1efc1410b508976dc.js93 KB57 KB (62%)✓3rd
https://s.gr-assets.com/assets/react_client_side/custom_react_ujs-b1220d5e0a4820e90b905c302fc5cb52.js1 KB—✓3rd
https://appleid.cdn-apple.com/appleauth/static/jsapi/appleid/1/en_US/appleid.auth.js17 KB—✓3rd
https://m.media-amazon.com/images/G/01/csminstrumentation/ue-full-11e51f253e8ad9d145f4ed644b40f692._V1_.js7 KB—✓3rd
https://m.media-amazon.com/images/I/41mrkPcyPwL.js9 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

F
Page Weight Inventory
Action
62 resources · 1.7 MB · 622 KB savings available
FIX
62 resources · 1.7 MB · 622 KB savings available
Warning::
Page weight 726 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~622 KB of savings available
Warning::
61 third-party resources (100% of weight)
Info::
2 resources over 200KB
62 resources · 1.7 MiB · 61 third-party 725.7 KiB over 1MB target
JavaScript 50% · 871.7 KiB
Image 44% · 773.2 KiB
CSS 5% · 84.8 KiB
Document 1% · 19.6 KiB
Other 0% · 403 B

~622.1 KiB of savings available

Remove unused JavaScript: 622.1 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.

C
Page Weight Budget
Action
1.7 MB transferred, 62 requests
REVIEW
1.7 MB transferred, 62 requests
Info::
Page weighs 4.5 MB (1.7 MB transferred)
Warning::
JavaScript is 872 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 872 KB
Info::
62 HTTP requests
Info::
Estimated 0.36 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
62 requests
0.36 g CO2 per page load
JavaScript 871.7 KiB 50%
Images 771.5 KiB 44%
CSS 84.8 KiB 5%
HTML 19.2 KiB 1%
Other 1.9 KiB 0%
Other 403 B 0%
Other 253 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
48 images, 0 KB saveable
REVIEW
48 images, 0 KB saveable
Warning::
https://s.gr-assets.com/assets/app/badge-ios-deskt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.gr-assets.com/assets/app/badge-android-d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://i.gr-assets.com/images/S/compressed.photo.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.gr-assets.com/assets/site_footer/footer_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.gr-assets.com/assets/site_footer/footer_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.gr-assets.com/assets/site_footer/footer_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.gr-assets.com/assets/award/2025/signed-o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.gr-assets.com/assets/an-amazon-company-l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.goodreads.com/assets/home/homepage_pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.gr-assets.com/assets/site_footer/footer_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s.gr-assets.com/assets/site_footer/footer_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
48 images 772 KB
0 oversized -0 KB
46 legacy format
11 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1481ms total JS execution
REVIEW
1481ms total JS execution
Warning::
https://www.goodreads.com/: 364ms CPU time
Warning::
Unattributable: 337ms CPU time
Warning::
https://s.gr-assets.com/assets/react_client_side/e...: 290ms CPU time
Info::
https://s.gr-assets.com/assets/react_client_side/s...: 234ms CPU time
Info::
https://s.gr-assets.com/assets/mobile/goodreads_mo...: 179ms CPU time
Warning::
Third-party scripts: 1481ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 25% Script Parsing & Compilation 18% Style & Layout 11% Rendering 9%
ScriptTotalScriptingParse/CompileParty
https://www.goodreads.com/364ms20ms5ms3rd
Unattributable337ms9ms0ms3rd
https://s.gr-assets.com/assets/react_client_side/external_dependencies-ebf499aa1f.js290ms96ms180ms3rd
https://s.gr-assets.com/assets/react_client_side/site_header-fbcaecc757.js234ms176ms57ms3rd
https://s.gr-assets.com/assets/mobile/goodreads_mobile-ae2234ad982e29a1efc1410b508976dc.js179ms131ms30ms3rd
https://s.gr-assets.com/assets/react_client_side/custom_react_ujs-b1220d5e0a4820e90b905c302fc5cb52.js79ms65ms0ms3rd
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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
62 requests over 1922ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.6 s LCP 11.7 shttps://goodreads.com// https://goodreads.com/ — 301 — 388 B — 313 ms — http/1.1https://www.goodreads.com/www.goodreads.com/ https://www.goodreads.com/ — 200 — 19.2 KiB — 523 ms — h2https://s.gr-assets.com/assets/mobile/application_phone-47a4627be5ef4733023c88f3f6330a75.csss.gr-assets.com/assets/mobile/appli... https://s.gr-assets.com/assets/mobile/application_phone-47a4627be5ef4733023c88f3f6330a75.css — 200 — 28.4 KiB — 114 ms — h2https://s.gr-assets.com/assets/mobile/goodreads_mobile-ae2234ad982e29a1efc1410b508976dc.jss.gr-assets.com/assets/mobile/goodr... https://s.gr-assets.com/assets/mobile/goodreads_mobile-ae2234ad982e29a1efc1410b508976dc.js — 200 — 92.6 KiB — 146 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/siteheaderbannerimages/1774894205i/696.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/siteheaderbannerimages/1774894205i/696.jpg — 200 — 11.1 KiB — 119 ms — h2https://s.gr-assets.com/assets/gr/icons/icon_close_white-dbf4152deeef5bd3915d5d12210bf05f.svgs.gr-assets.com/assets/gr/icons/ico... https://s.gr-assets.com/assets/gr/icons/icon_close_white-dbf4152deeef5bd3915d5d12210bf05f.svg — 200 — 802 B — 112 ms — h2https://www.goodreads.com/assets/home/homepage_promos/reading_challenge_2026/HomepageMasthead_Mobile@2x.pngwww.goodreads.com/assets/home/homep... https://www.goodreads.com/assets/home/homepage_promos/reading_challenge_2026/HomepageMasthead_Mobile@2x.png — 200 — 303.8 KiB — 618 ms — h2https://s.gr-assets.com/assets/mobile/phone_images-8161ab8e62d5ae1912c2c8cea0ec2167.csss.gr-assets.com/assets/mobile/phone... https://s.gr-assets.com/assets/mobile/phone_images-8161ab8e62d5ae1912c2c8cea0ec2167.css — 200 — 56.4 KiB — 27 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1706724269i/90202302._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1706724269i/90202302._UX187_.jpg — 200 — 22.9 KiB — 44 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1629082970i/58778536._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1629082970i/58778536._UX187_.jpg — 200 — 17.9 KiB — 47 ms — h2https://s.gr-assets.com/assets/react_client_side/external_dependencies-ebf499aa1f.jss.gr-assets.com/assets/react_client... https://s.gr-assets.com/assets/react_client_side/external_dependencies-ebf499aa1f.js — 200 — 604.2 KiB — 137 ms — h2https://s.gr-assets.com/assets/react_client_side/site_header-fbcaecc757.jss.gr-assets.com/assets/react_client... https://s.gr-assets.com/assets/react_client_side/site_header-fbcaecc757.js — 200 — 139.5 KiB — 135 ms — h2https://s.gr-assets.com/assets/react_client_side/custom_react_ujs-b1220d5e0a4820e90b905c302fc5cb52.jss.gr-assets.com/assets/react_client... https://s.gr-assets.com/assets/react_client_side/custom_react_ujs-b1220d5e0a4820e90b905c302fc5cb52.js — 200 — 1.5 KiB — 108 ms — h2https://s.gr-assets.com/assets/app/badge-android-highres-e46912ad93a09553adffc67550d3b562.pngs.gr-assets.com/assets/app/badge-an... https://s.gr-assets.com/assets/app/badge-android-highres-e46912ad93a09553adffc67550d3b562.png — 200 — 11.2 KiB — 121 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1719020904i/214151348._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1719020904i/214151348._UX187_.jpg — 200 — 14.1 KiB — 56 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1741291185i/35297426._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1741291185i/35297426._UX187_.jpg — 200 — 24.1 KiB — 58 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1709669000i/209528913._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1709669000i/209528913._UX187_.jpg — 200 — 8.0 KiB — 60 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1772189284i/244120095._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1772189284i/244120095._UX187_.jpg — 200 — 13.4 KiB — 59 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1461354651i/15839976._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1461354651i/15839976._UX187_.jpg — 200 — 12.9 KiB — 63 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1744280259i/231243266._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1744280259i/231243266._UX187_.jpg — 200 — 12.3 KiB — 60 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1670363463i/58416952._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1670363463i/58416952._UX187_.jpg — 200 — 17.1 KiB — 68 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1718927363i/210708924._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1718927363i/210708924._UX187_.jpg — 200 — 15.5 KiB — 70 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1750875554i/234069612._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1750875554i/234069612._UX187_.jpg — 200 — 13.6 KiB — 75 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1750953057i/231698932._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1750953057i/231698932._UX187_.jpg — 200 — 13.2 KiB — 71 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1770321051i/247357777._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1770321051i/247357777._UX187_.jpg — 200 — 16.3 KiB — 86 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1749394007i/235992486._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1749394007i/235992486._UX187_.jpg — 200 — 13.5 KiB — 72 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1772850604i/236226582._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1772850604i/236226582._UX187_.jpg — 200 — 18.9 KiB — 75 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1753411750i/239152335._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1753411750i/239152335._UX187_.jpg — 200 — 11.3 KiB — 84 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1751287829i/231127042._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1751287829i/231127042._UX187_.jpg — 200 — 16.5 KiB — 95 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1749400685i/235992492._UX187_.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1749400685i/235992492._UX187_.jpg — 200 — 8.9 KiB — 80 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.6 s LCP 11.7 shttps://goodreads.com// https://goodreads.com/ — 301 — 388 B — 313 ms — http/1.1https://www.goodreads.com/www.goodreads.com/ https://www.goodreads.com/ — 200 — 19.2 KiB — 523 ms — h2https://s.gr-assets.com/assets/mobile/application_phone-47a4627be5ef4733023c88f3f6330a75.csss.gr-assets.com/assets/mobile/appli... https://s.gr-assets.com/assets/mobile/application_phone-47a4627be5ef4733023c88f3f6330a75.css — 200 — 28.4 KiB — 114 ms — h2https://s.gr-assets.com/assets/mobile/goodreads_mobile-ae2234ad982e29a1efc1410b508976dc.jss.gr-assets.com/assets/mobile/goodr... https://s.gr-assets.com/assets/mobile/goodreads_mobile-ae2234ad982e29a1efc1410b508976dc.js — 200 — 92.6 KiB — 146 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/siteheaderbannerimages/1774894205i/696.jpgi.gr-assets.com/images/S/compressed... https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/siteheaderbannerimages/1774894205i/696.jpg — 200 — 11.1 KiB — 119 ms — h2https://s.gr-assets.com/assets/gr/icons/icon_close_white-dbf4152deeef5bd3915d5d12210bf05f.svgs.gr-assets.com/assets/gr/icons/ico... https://s.gr-assets.com/assets/gr/icons/icon_close_white-dbf4152deeef5bd3915d5d12210bf05f.svg — 200 — 802 B — 112 ms — h2https://www.goodreads.com/assets/home/homepage_promos/reading_challenge_2026/HomepageMasthead_Mobile@2x.pngwww.goodreads.com/assets/home/homep... https://www.goodreads.com/assets/home/homepage_promos/reading_challenge_2026/HomepageMasthead_Mobile@2x.png — 200 — 303.8 KiB — 618 ms — h2https://s.gr-assets.com/assets/mobile/phone_images-8161ab8e62d5ae1912c2c8cea0ec2167.csss.gr-assets.com/assets/mobile/phone... https://s.gr-assets.com/assets/mobile/phone_images-8161ab8e62d5ae1912c2c8cea0ec2167.css — 200 — 56.4 KiB — 27 ms — h2https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1706724269i/90202302._UX187_.jpgi.gr-assets.com/images/S/compressed... 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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 1481ms · 857KB · $20/mo
www.goodreads.com
Other
Costly
Execution 364ms
Transfer 19 KB
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 337ms
Transfer 0 KB
Monthly Cost $4/mo
s.gr-assets.com
Other
Costly
Execution 290ms
Transfer 604 KB
Unused 83%
Monthly Cost $4/mo
s.gr-assets.com
Other
Costly
Execution 234ms
Transfer 139 KB
Unused 47%
Monthly Cost $3/mo
s.gr-assets.com
Other
Optional
Execution 179ms
Transfer 93 KB
Unused 62%
Monthly Cost $2/mo
s.gr-assets.com
Other
Optional
Execution 79ms
Transfer 1 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.goodreads.com adds 364ms and costs ~$5/month
  • Unattributable adds 337ms and costs ~$4/month
  • s.gr-assets.com adds 290ms and costs ~$4/month
  • s.gr-assets.com adds 234ms 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.goodreads.com takes 364ms 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 337ms 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

s.gr-assets.com takes 290ms 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

83% of s.gr-assets.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

s.gr-assets.com takes 234ms 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

62% of s.gr-assets.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

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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