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https://hachettebookgroup.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
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.
83
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

1.12 s

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

1.50 s

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

30 ms

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

0.001

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

2.49 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

4.16 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
12.9 MB transferred, 252 requests
FIX
12.9 MB transferred, 252 requests
Critical::
Page weighs 18.6 MB (12.9 MB transferred)
Warning::
Images are 10.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 10.9 MB
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Warning::
252 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.7 g CO2 per page load
12.9 MB / 2.4 MB budget
12.9 MB transferred
252 requests
2.7 g CO2 per page load
Images 10.9 MiB 84%
JavaScript 1.8 MiB 14%
HTML 95.1 KiB 1%
Fonts 77.6 KiB 1%
CSS 42.2 KiB 0%
Other 32.0 KiB 0%
Other 11.3 KiB 0%
Other 3.6 KiB 0%
Other 1.5 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (12.9 MiB of 12.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
70 scripts, 698 KB unused
FIX
70 scripts, 698 KB unused
Warning::
https://analytics.tiktok.com/i18n/pixel/static/mai...: 89 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.hachettebookgroup.com/wp-content/theme...: 71 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 69 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 67 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5LR...: 62 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 698 KB
698 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOA.js117 KB89 KB (76%)✓3rd
https://www.hachettebookgroup.com/wp-content/themes/hachette-book-group-2023/client/src/js/cart/cart.js?ver=0.2146 KB71 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-975336840&cx=c&gtm=4e64h1145 KB69 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-927549630&cx=c&gtm=4e64h1137 KB67 KB (49%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5LRFFXK&gtm_auth=EVafa-1EU0ArWEPW1vxdeQ&gtm_preview=env-24&gtm_cookies_win=x173 KB62 KB (36%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-71QZ570PZE&cx=c&gtm=4e64h1145 KB61 KB (42%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js106 KB55 KB (52%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB52 KB (67%)✓3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-019948276f5166670cb8f0c64d12207c8fab7513/Render.09c3b018e31bf53360b4.js52 KB42 KB (82%)✓3rd
https://connect.facebook.net/signals/config/157411788180383?v=2.9.303&r=stable&domain=www.hachettebookgroup.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168126 KB36 KB (29%)✓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
252 resources · 12.9 MB · 698 KB savings available
FIX
252 resources · 12.9 MB · 698 KB savings available
Warning::
Page weight 11.9 MB over 1MB target
Got: 12.9 MB Expected: ≤ 1 MB
Info::
~698 KB of savings available
Warning::
251 third-party resources (100% of weight)
Info::
17 resources over 200KB
252 resources · 12.9 MiB · 251 third-party 11.9 MiB over 1MB target
Image 84% · 10.9 MiB
JavaScript 14% · 1.8 MiB
Document 1% · 95.8 KiB
Font 1% · 77.6 KiB
Other 0% · 47.1 KiB
CSS 0% · 42.2 KiB

~698.4 KiB of savings available

Remove unused JavaScript: 698.4 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.

B
Image Optimization
137 images, 0 KB saveable
REVIEW
137 images, 0 KB saveable
Info::
All images are well-optimized
137 images 10.9 MB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1025ms total JS execution
REVIEW
1025ms total JS execution
Warning::
Unattributable: 305ms CPU time
Warning::
https://www.hachettebookgroup.com/: 289ms CPU time
Info::
https://analytics.tiktok.com/i18n/pixel/static/mai...: 156ms CPU time
Info::
https://www.hachettebookgroup.com/wp-content/theme...: 110ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5LR...: 85ms CPU time
Warning::
Third-party scripts: 1025ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 22% Style & Layout 15% Script Parsing & Compilation 10% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable305ms9ms0ms3rd
https://www.hachettebookgroup.com/289ms12ms1ms3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js156ms100ms54ms3rd
https://www.hachettebookgroup.com/wp-content/themes/hachette-book-group-2023/client/build/js/global.bundle.min.js?ver=253b3767b8deaf199e79110ms31ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5LRFFXK&gtm_auth=EVafa-1EU0ArWEPW1vxdeQ&gtm_preview=env-24&gtm_cookies_win=x85ms70ms12ms3rd
https://connect.facebook.net/signals/config/157411788180383?v=2.9.303&r=stable&domain=www.hachettebookgroup.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16880ms63ms9ms3rd
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
3 fonts (78 KB)
PASS
3 fonts (78 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

78 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 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.5 shttps://use.typekit.net/af/23ddd7/00000000000000003b9b489e/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/23ddd7/00000000000000003b9b489e/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 25.3 KiB — 25 ms — font-display: swaphttps://use.typekit.net/af/46da36/00000000000000003b9acaf6/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/46da36/00000000000000003b9acaf6/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 26.4 KiB — 40 ms — font-display: swaphttps://use.typekit.net/af/2dce9d/00000000000000003b9b489b/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/2dce9d/00000000000000003b9b489b/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 25.8 KiB — 5 ms — font-display: swap
l woff2 swap
Size 25 KB
Load time 25 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 40 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 5 ms
Start 1.4 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
Network Waterfall
252 requests over 5201ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.1 s LCP 1.5 shttps://hachettebookgroup.com// https://hachettebookgroup.com/ — 301 — 144 B — 177 ms — h2https://www.hachettebookgroup.com/www.hachettebookgroup.com/ https://www.hachettebookgroup.com/ — 200 — 94.9 KiB — 742 ms — h2https://static.klaviyo.com/onsite/js/SNS8eT/klaviyo.jsstatic.klaviyo.com/onsite/js/SNS8eT... https://static.klaviyo.com/onsite/js/SNS8eT/klaviyo.js — 200 — 2.7 KiB — 57 ms — h2https://use.typekit.net/dwh4ner.css?ver=1.0.0use.typekit.net/dwh4ner.css?ver=1.0... https://use.typekit.net/dwh4ner.css?ver=1.0.0 — 200 — 1009 B — 42 ms — h2https://www.hachettebookgroup.com/wp-content/themes/hachette-book-group-2023/client/build/css/global.min.css?ver=f80863f4c3cc59a1e2b7www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/themes/hachette-book-group-2023/client/build/css/global.min.css?ver=f80863f4c3cc59a1e2b7 — 200 — 27.8 KiB — 8 ms — h2https://www.hachettebookgroup.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.hachettebookgroup.com/wp-includ... https://www.hachettebookgroup.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 31.0 KiB — 12 ms — h2https://www.hachettebookgroup.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.hachettebookgroup.com/wp-includ... https://www.hachettebookgroup.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.2 KiB — 9 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2017/06/Web-Banner-8.png?resize=1024,384www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2017/06/Web-Banner-8.png?resize=1024,384 — 200 — 112.9 KiB — 16 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2017/06/Web-Banner-8.png?resize=1536,576www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2017/06/Web-Banner-8.png?resize=1536,576 — 200 — 220.6 KiB — 17 ms — h2https://www.hachettebookgroup.com/wp-content/plugins/hachette-plugin/build/campaignViewFrontEnd.bundle.min.js?ver=52d0fc7df8341a6c76c5www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/plugins/hachette-plugin/build/campaignViewFrontEnd.bundle.min.js?ver=52d0fc7df8341a6c76c5 — 200 — 2.5 KiB — 16 ms — h2https://www.hachettebookgroup.com/wp-content/themes/hachette-book-group-2023/client/build/js/global.bundle.min.js?ver=253b3767b8deaf199e79www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/themes/hachette-book-group-2023/client/build/js/global.bundle.min.js?ver=253b3767b8deaf199e79 — 200 — 16.2 KiB — 5 ms — h2https://www.hachettebookgroup.com/wp-content/themes/hachette-book-group-2023/client/src/js/cart/cart.js?ver=0.2www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/themes/hachette-book-group-2023/client/src/js/cart/cart.js?ver=0.2 — 200 — 146.0 KiB — 6 ms — 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https://www.hachettebookgroup.com/wp-content/uploads/2024/01/9780316473125.jpg?resize=200,200 — 200 — 9.8 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2024/04/9781538725979.jpg?resize=131,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2024/04/9781538725979.jpg?resize=131,200 — 200 — 5.5 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2022/10/9780316543033.jpg?resize=131,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2022/10/9780316543033.jpg?resize=131,200 — 200 — 5.2 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2023/04/9780316417228.jpg?resize=129,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2023/04/9780316417228.jpg?resize=129,200 — 200 — 6.3 KiB — 5 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781643752846.jpg?resize=132,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781643752846.jpg?resize=132,200 — 200 — 9.1 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2023/08/9781668623459.jpg?resize=200,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2023/08/9781668623459.jpg?resize=200,200 — 200 — 7.5 KiB — 4 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2026/02/9780316055444.jpg?resize=130,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2026/02/9780316055444.jpg?resize=130,200 — 200 — 3.8 KiB — 4 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2026/02/9780316316132.jpg?resize=133,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2026/02/9780316316132.jpg?resize=133,200 — 200 — 3.8 KiB — 4 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781579656317.jpg?resize=148,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781579656317.jpg?resize=148,200 — 200 — 7.9 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2024/01/9780316494175.jpg?resize=154,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2024/01/9780316494175.jpg?resize=154,200 — 200 — 8.2 KiB — 4 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2026/02/9781643753607.jpg?resize=128,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2026/02/9781643753607.jpg?resize=128,200 — 200 — 7.3 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2022/08/9780316492935-1.jpg?resize=129,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2022/08/9780316492935-1.jpg?resize=129,200 — 200 — 5.8 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2022/04/9781668604588-1.jpg?resize=200,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2022/04/9781668604588-1.jpg?resize=200,200 — 200 — 5.2 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2022/10/9780316540537.jpg?resize=133,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2022/10/9780316540537.jpg?resize=133,200 — 200 — 7.8 KiB — 4 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2021/07/9781423106357-1.jpg?resize=182,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2021/07/9781423106357-1.jpg?resize=182,200 — 200 — 8.4 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781643750743.jpg?resize=133,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781643750743.jpg?resize=133,200 — 200 — 9.6 KiB — 5 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781579658472.jpg?resize=150,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781579658472.jpg?resize=150,200 — 200 — 4.6 KiB — 4 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2023/02/9780316056618-2.jpg?resize=137,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2023/02/9780316056618-2.jpg?resize=137,200 — 200 — 8.3 KiB — 4 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2019/02/97803164044881.jpg?resize=200,155www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2019/02/97803164044881.jpg?resize=200,155 — 200 — 7.6 KiB — 3 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2024/01/9780316561723.jpg?resize=133,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2024/01/9780316561723.jpg?resize=133,200 — 200 — 5.7 KiB — 141 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781579659561.jpg?resize=149,200www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2025/12/9781579659561.jpg?resize=149,200 — 200 — 8.4 KiB — 323 ms — h2https://www.hachettebookgroup.com/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4www.hachettebookgroup.com/wp-includ... https://www.hachettebookgroup.com/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4 — 200 — 5.4 KiB — 4 ms — h2https://www.hachettebookgroup.com/wp-content/uploads/2017/09/cropped-hachette-logo1.png?w=32www.hachettebookgroup.com/wp-conten... https://www.hachettebookgroup.com/wp-content/uploads/2017/09/cropped-hachette-logo1.png?w=32 — 200 — 517 B — 5 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 1025ms · 517KB · $6/mo
Unattributable
Other
Costly
Execution 305ms
Transfer 0 KB
Monthly Cost $2/mo
www.hachettebookgroup.com
Other
Costly
Execution 289ms
Transfer 95 KB
Monthly Cost $2/mo
analytics.tiktok.com
Other
Optional
Execution 156ms
Transfer 106 KB
Unused 52%
Monthly Cost $1/mo
www.hachettebookgroup.com
Other
Optional
Execution 110ms
Transfer 16 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 173 KB
Unused 36%
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 80ms
Transfer 126 KB
Unused 29%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 305ms and costs ~$2/month
  • www.hachettebookgroup.com adds 289ms and costs ~$2/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

Unattributable takes 305ms 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.hachettebookgroup.com takes 289ms 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

52% of analytics.tiktok.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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