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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
80
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
78
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

929 ms

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

3.08 s

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

0 ms

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

0.019

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

1.52 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.

3.09 s

Page Load Progression

455 ms
910 ms
1.4 s
1.8 s
2.3 s
2.7 s
3.2 s
3.6 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
2.7 MB transferred, 31 requests
FIX
2.7 MB transferred, 31 requests
Warning::
Page weighs 4.0 MB (2.7 MB transferred)
Info::
31 HTTP requests
Info::
Estimated 0.57 g CO2 per page load
2.7 MB / 2.4 MB budget
2.7 MB transferred
31 requests
0.57 g CO2 per page load
Other 1.9 MiB 69%
JavaScript 382.4 KiB 14%
Images 317.7 KiB 11%
Fonts 85.0 KiB 3%
HTML 36.0 KiB 1%
CSS 32.2 KiB 1%
Other 3.0 KiB 0%
Other 964 B 0%
Other 818 B 0%
0 2.4 MB 4.9 MB
Over budget
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
Page Weight Inventory
Action
31 resources · 2.7 MB · 161 KB savings available
FIX
31 resources · 2.7 MB · 161 KB savings available
Warning::
Page weight 1.7 MB over 1MB target
Got: 2.7 MB Expected: ≤ 1 MB
Info::
~161 KB of savings available
Warning::
30 third-party resources (100% of weight)
Info::
1 resources over 200KB
31 resources · 2.7 MiB · 30 third-party 1.7 MiB over 1MB target
Media 69% · 1.9 MiB
JavaScript 14% · 382.4 KiB
Image 11% · 320.2 KiB
Font 3% · 85.0 KiB
Document 1% · 36.3 KiB
CSS 1% · 32.2 KiB
Other 0% · 1.9 KiB

~161.1 KiB of savings available

Remove unused JavaScript: 161.1 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
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d28hgpri8am2if.cloudfront.net/book_images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d28hgpri8am2if.cloudfront.net/book_images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d28hgpri8am2if.cloudfront.net/book_images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d28hgpri8am2if.cloudfront.net/book_images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d28hgpri8am2if.cloudfront.net/book_images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d28hgpri8am2if.cloudfront.net/book_images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d1hbl61hovme3a.cloudfront.net/assets_us/mo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d28hgpri8am2if.cloudfront.net/book_images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://d28hgpri8am2if.cloudfront.net/book_images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 318 KB
0 oversized -0 KB
10 legacy format
10 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

B
JS Execution Cost
507ms total JS execution
REVIEW
507ms total JS execution
Info::
https://www.simonandschuster.com/: 108ms CPU time
Info::
https://d1dyndsnc54cq8.cloudfront.net/assets/promo...: 94ms CPU time
Info::
https://d1dyndsnc54cq8.cloudfront.net/assets/appli...: 87ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-P2L...: 81ms CPU time
Info::
Unattributable: 75ms CPU time
Warning::
Third-party scripts: 507ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 24% Style & Layout 17% Script Parsing & Compilation 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.simonandschuster.com/108ms20ms1ms3rd
https://d1dyndsnc54cq8.cloudfront.net/assets/promo_ticker_d0be803b75f281fadc72.js94ms28ms2ms3rd
https://d1dyndsnc54cq8.cloudfront.net/assets/application_adbe318fb7b4a6039ab7.js87ms53ms9ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P2LJ2NV81ms64ms15ms3rd
Unattributable75ms2ms0ms3rd
https://www.simonandschuster.com/cdn-cgi/challenge-platform/scripts/jsd/main.js61ms56ms1ms3rd
C
JS Bundles
Action
7 scripts, 161 KB unused
REVIEW
7 scripts, 161 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P2L...: 79 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d1dyndsnc54cq8.cloudfront.net/assets/appli...: 50 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sdks.shopifycdn.com/buy-button/latest/buy-...: 32 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 161 KB
161 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-P2LJ2NV178 KB79 KB (44%)✓3rd
https://d1dyndsnc54cq8.cloudfront.net/assets/application_adbe318fb7b4a6039ab7.js100 KB50 KB (51%)✓3rd
https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.js60 KB32 KB (54%)✓3rd
https://d1dyndsnc54cq8.cloudfront.net/assets/promo_ticker_d0be803b75f281fadc72.js28 KB—✓3rd
https://d1dyndsnc54cq8.cloudfront.net/assets/bulma_billboard_c4af258eeef61cf39ac6.js4 KB—✓3rd
https://www.simonandschuster.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 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

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
5 fonts (85 KB)
PASS
5 fonts (85 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

85 KB total

Render-blocking

0

of 5

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 FCP 929 ms LCP 3.1 sdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 46 ms — font-display: swaphttps://d1dyndsnc54cq8.cloudfront.net/assets/Hind-Regular_b2d495f1d7e95c8e120c05fc490ef3f1.woff2Hind-Regular_b2d495f1d7... https://d1dyndsnc54cq8.cloudfront.net/assets/Hind-Regular_b2d495f1d7e95c8e120c05fc490ef3f1.woff2 — 17.7 KiB — 58 ms — font-display: swaphttps://d1dyndsnc54cq8.cloudfront.net/assets/LibreBaskerville-Regular_adb196b250bef55fb52c38d1a7226c14.woff2LibreBaskerville-Regula... https://d1dyndsnc54cq8.cloudfront.net/assets/LibreBaskerville-Regular_adb196b250bef55fb52c38d1a7226c14.woff2 — 29.6 KiB — 71 ms — font-display: swaphttps://d1dyndsnc54cq8.cloudfront.net/assets/Hind-SemiBold_9d94ebbc848672930d789dcb27fd7b7d.woff2Hind-SemiBold_9d94ebbc8... https://d1dyndsnc54cq8.cloudfront.net/assets/Hind-SemiBold_9d94ebbc848672930d789dcb27fd7b7d.woff2 — 18.5 KiB — 74 ms — font-display: swaphttps://d1dyndsnc54cq8.cloudfront.net/assets/Hind-Bold_5d3067799d22ffbc9ef8343bdbd1ce47.woff2Hind-Bold_5d3067799d22f... https://d1dyndsnc54cq8.cloudfront.net/assets/Hind-Bold_5d3067799d22ffbc9ef8343bdbd1ce47.woff2 — 17.6 KiB — 77 ms — font-display: swap
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 46 ms
Start 863 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Hind-Regular_b2d495f1d7... woff2 swap
Size 18 KB
Load time 58 ms
Start 903 ms
Risk FOUT — text flashes from fallback to web font
LibreBaskerville-Regula... woff2 swap
Size 30 KB
Load time 71 ms
Start 903 ms
Risk FOUT — text flashes from fallback to web font
Hind-SemiBold_9d94ebbc8... woff2 swap
Size 19 KB
Load time 74 ms
Start 904 ms
Risk FOUT — text flashes from fallback to web font
Hind-Bold_5d3067799d22f... woff2 swap
Size 18 KB
Load time 77 ms
Start 904 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
31 requests over 1335ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 929 ms LCP 3.1 shttps://simonandschuster.com// https://simonandschuster.com/ — 301 — 297 B — 286 ms — h2https://www.simonandschuster.com/www.simonandschuster.com/ https://www.simonandschuster.com/ — 200 — 36.0 KiB — 485 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/application_639907eb8e5e4e5f9814.cssd1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/application_639907eb8e5e4e5f9814.css — 200 — 31.0 KiB — 60 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/promo_ticker_6b2447ddbbd5639cf418.cssd1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/promo_ticker_6b2447ddbbd5639cf418.css — 200 — 1.2 KiB — 56 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/application_adbe318fb7b4a6039ab7.jsd1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/application_adbe318fb7b4a6039ab7.js — 200 — 99.7 KiB — 38 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/promo_ticker_d0be803b75f281fadc72.jsd1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/promo_ticker_d0be803b75f281fadc72.js — 200 — 28.0 KiB — 40 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/bulma_billboard_c4af258eeef61cf39ac6.jsd1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/bulma_billboard_c4af258eeef61cf39ac6.js — 200 — 4.1 KiB — 37 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-P2LJ2NVwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-P2LJ2NV — 200 — 178.0 KiB — 164 ms — h2https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.jssdks.shopifycdn.com/buy-button/late... https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.js — 200 — 60.3 KiB — 79 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/540a7631d3f89742b767e53536e7ebc7.jpgd1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/540a7631d3f89742b767e53536e7ebc7.jpg — 200 — 26.4 KiB — 23 ms — h2data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…data:application/font-woff;charset=... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 200 — 1.6 KiB — 46 ms — datahttps://d1dyndsnc54cq8.cloudfront.net/assets/Hind-Regular_b2d495f1d7e95c8e120c05fc490ef3f1.woff2d1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/Hind-Regular_b2d495f1d7e95c8e120c05fc490ef3f1.woff2 — 200 — 17.7 KiB — 58 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/LibreBaskerville-Regular_adb196b250bef55fb52c38d1a7226c14.woff2d1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/LibreBaskerville-Regular_adb196b250bef55fb52c38d1a7226c14.woff2 — 200 — 29.6 KiB — 71 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/Hind-SemiBold_9d94ebbc848672930d789dcb27fd7b7d.woff2d1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/Hind-SemiBold_9d94ebbc848672930d789dcb27fd7b7d.woff2 — 200 — 18.5 KiB — 74 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/Hind-Bold_5d3067799d22ffbc9ef8343bdbd1ce47.woff2d1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/Hind-Bold_5d3067799d22ffbc9ef8343bdbd1ce47.woff2 — 200 — 17.6 KiB — 77 ms — h2https://d1hbl61hovme3a.cloudfront.net/assets_us/110466-caretaker-sns-billboard.mp4d1hbl61hovme3a.cloudfront.net/asset... https://d1hbl61hovme3a.cloudfront.net/assets_us/110466-caretaker-sns-billboard.mp4 — 206 — 1.9 MiB — 159 ms — h2https://www.simonandschuster.com/cdn-cgi/challenge-platform/scripts/jsd/main.jswww.simonandschuster.com/cdn-cgi/ch... https://www.simonandschuster.com/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 141 B — 20 ms — h2https://www.simonandschuster.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?www.simonandschuster.com/cdn-cgi/ch... https://www.simonandschuster.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 12.4 KiB — 22 ms — h2https://monorail-edge.shopifysvc.com/v1/producemonorail-edge.shopifysvc.com/v1/pro... https://monorail-edge.shopifysvc.com/v1/produce — 200 — 818 B — 190 ms — h2https://www.simonandschuster.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.6688030970413026:1776809557:O7rLN3nqnRpqq1ETlvF4OHvbb1xtfdyTnSr74k0fOwE/9effd9341e11d12cwww.simonandschuster.com/cdn-cgi/ch... https://www.simonandschuster.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.6688030970413026:1776809557:O7rLN3nqnRpqq1ETlvF4OHvbb1xtfdyTnSr74k0fOwE/9effd9341e11d12c — 200 — 964 B — 39 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668033104/this-land-is-your-land-9781668033104.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668033104/this-land-is-your-land-9781668033104.jpg — 200 — 19.5 KiB — 60 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668236512/theo-of-golden-9781668236512.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668236512/theo-of-golden-9781668236512.jpg — 200 — 11.4 KiB — 62 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982134594/apple-9781982134594.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982134594/apple-9781982134594.jpg — 200 — 6.9 KiB — 69 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781501183065/a-walk-in-the-park-9781501183065.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781501183065/a-walk-in-the-park-9781501183065.jpg — 200 — 22.0 KiB — 79 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668054451/king-arthur-baking-companys-book-of-pizza-9781668054451.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668054451/king-arthur-baking-companys-book-of-pizza-9781668054451.jpg — 200 — 23.9 KiB — 76 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982178970/once-upon-a-time-9781982178970.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982178970/once-upon-a-time-9781982178970.jpg — 200 — 15.6 KiB — 84 ms — h2https://d1hbl61hovme3a.cloudfront.net/assets_us/mother%27s-day-tentpoles-content-card.pngd1hbl61hovme3a.cloudfront.net/asset... https://d1hbl61hovme3a.cloudfront.net/assets_us/mother%27s-day-tentpoles-content-card.png — 200 — 166.3 KiB — 24 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 66 ms — https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982185831/im-glad-my-mom-died-9781982185831.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982185831/im-glad-my-mom-died-9781982185831.jpg — 200 — 13.3 KiB — 32 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/favicon-global.pngd1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/favicon-global.png — 200 — 2.5 KiB — 19 ms — h2
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— 200 — 12.4 KiB — 22 ms — h2https://monorail-edge.shopifysvc.com/v1/producemonorail-edge.shopifysvc.com/v1/pro... https://monorail-edge.shopifysvc.com/v1/produce — 200 — 818 B — 190 ms — h2https://www.simonandschuster.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.6688030970413026:1776809557:O7rLN3nqnRpqq1ETlvF4OHvbb1xtfdyTnSr74k0fOwE/9effd9341e11d12cwww.simonandschuster.com/cdn-cgi/ch... https://www.simonandschuster.com/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.6688030970413026:1776809557:O7rLN3nqnRpqq1ETlvF4OHvbb1xtfdyTnSr74k0fOwE/9effd9341e11d12c — 200 — 964 B — 39 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668033104/this-land-is-your-land-9781668033104.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668033104/this-land-is-your-land-9781668033104.jpg — 200 — 19.5 KiB — 60 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668236512/theo-of-golden-9781668236512.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668236512/theo-of-golden-9781668236512.jpg — 200 — 11.4 KiB — 62 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982134594/apple-9781982134594.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982134594/apple-9781982134594.jpg — 200 — 6.9 KiB — 69 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781501183065/a-walk-in-the-park-9781501183065.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781501183065/a-walk-in-the-park-9781501183065.jpg — 200 — 22.0 KiB — 79 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668054451/king-arthur-baking-companys-book-of-pizza-9781668054451.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668054451/king-arthur-baking-companys-book-of-pizza-9781668054451.jpg — 200 — 23.9 KiB — 76 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982178970/once-upon-a-time-9781982178970.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982178970/once-upon-a-time-9781982178970.jpg — 200 — 15.6 KiB — 84 ms — h2https://d1hbl61hovme3a.cloudfront.net/assets_us/mother%27s-day-tentpoles-content-card.pngd1hbl61hovme3a.cloudfront.net/asset... https://d1hbl61hovme3a.cloudfront.net/assets_us/mother%27s-day-tentpoles-content-card.png — 200 — 166.3 KiB — 24 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 66 ms — https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982185831/im-glad-my-mom-died-9781982185831.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781982185831/im-glad-my-mom-died-9781982185831.jpg — 200 — 13.3 KiB — 32 ms — h2https://d1dyndsnc54cq8.cloudfront.net/assets/favicon-global.pngd1dyndsnc54cq8.cloudfront.net/asset... https://d1dyndsnc54cq8.cloudfront.net/assets/favicon-global.png — 200 — 2.5 KiB — 19 ms — h2https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668068809/rory-9781668068809.jpgd28hgpri8am2if.cloudfront.net/book_... https://d28hgpri8am2if.cloudfront.net/book_images/onix/cvr9781668068809/rory-9781668068809.jpg — 200 — 12.5 KiB — 19 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 507ms · 342KB · €3/mo
www.simonandschuster.com
Other
Optional
Execution 108ms
Transfer 36 KB
Monthly Cost €1/mo
d1dyndsnc54cq8.cloudfront.net
Other
Optional
Execution 94ms
Transfer 28 KB
Monthly Cost €0/mo
d1dyndsnc54cq8.cloudfront.net
Other
Optional
Execution 87ms
Transfer 100 KB
Unused 51%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 178 KB
Unused 44%
Monthly Cost €0/mo
Unattributable
Other
Optional
Execution 75ms
Transfer 0 KB
Monthly Cost €0/mo
www.simonandschuster.com
Other
Optional
Execution 61ms
Transfer 0 KB
Monthly Cost €0/mo

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

51% of d1dyndsnc54cq8.cloudfront.net'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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