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https://harpercollins.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
6
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
74
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.

951 ms

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

2.91 s

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

258 ms

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

0.072

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

8.32 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.

7.12 s

Page Load Progression

5.6 s
11.2 s
16.8 s
22.4 s
28.0 s
33.6 s
39.2 s
44.8 s
Checks
15
6 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
8.9 MB transferred, 641 requests
FIX
8.9 MB transferred, 641 requests
Critical::
Page weighs 15.9 MB (8.9 MB transferred)
Warning::
JavaScript is 2.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.6 MB
Warning::
Images are 2.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.1 MB
Warning::
641 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.9 g CO2 per page load
8.9 MB / 2.4 MB budget
8.9 MB transferred
641 requests
1.9 g CO2 per page load
Other 2.8 MiB 31%
JavaScript 2.6 MiB 29%
Images 2.1 MiB 23%
Other 827.8 KiB 9%
HTML 210.2 KiB 2%
Fonts 197.4 KiB 2%
CSS 176.1 KiB 2%
Other 12.6 KiB 0%
Other 11.1 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

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 (8.9 MiB of 8.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9517ms total JS execution
FIX
9517ms total JS execution
Warning::
https://www.redditstatic.com/ads/pixel.js: 3961ms CPU time
Warning::
Unattributable: 1652ms CPU time
Warning::
https://www.harpercollins.com/: 1424ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 590ms CPU time
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/...: 462ms CPU time
Warning::
Third-party scripts: 9517ms (100% of total)

Main Thread Breakdown

Script Evaluation 61% Other 22% Style & Layout 9% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.redditstatic.com/ads/pixel.js3961ms3642ms2ms3rd
Unattributable1652ms147ms0ms3rd
https://www.harpercollins.com/1424ms170ms16ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js590ms451ms23ms3rd
https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879462ms125ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3243ms208ms18ms3rd
https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js145ms135ms2ms3rd
https://www.harpercollins.com/cdn/wpm/b5153dfa3wa14e0a32p72aa89e7m94579b79m.js136ms105ms5ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js118ms105ms4ms3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMg.js108ms90ms14ms3rd

Showing top 10 of 19 scripts

F
JS Bundles
Action
147 scripts, 1.0 MB unused
FIX
147 scripts, 1.0 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 61 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-155...: 61 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.0 MB
1070 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-16769633610&cx=c&gtm=4e64h1144 KB61 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-15547771&cx=c&gtm=4e64h1129 KB61 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-BWH2Y83W11&cx=c&gtm=4e64h1151 KB59 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3180 KB59 KB (33%)✓3rd
https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_externals.js?v=13142495312170147352166672112781 KB59 KB (73%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMg.js106 KB56 KB (53%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB33 KB (34%)✓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
641 resources · 8.9 MB · 1.0 MB savings available
FIX
641 resources · 8.9 MB · 1.0 MB savings available
Warning::
Page weight 7.9 MB over 1MB target
Got: 8.9 MB Expected: ≤ 1 MB
Info::
~1.0 MB of savings available
Warning::
640 third-party resources (100% of weight)
Info::
3 resources over 200KB
641 resources · 8.9 MiB · 640 third-party 7.9 MiB over 1MB target
JavaScript 38% · 3.4 MiB
Document 33% · 3.0 MiB
Image 24% · 2.1 MiB
CSS 2% · 217.4 KiB
Font 2% · 197.4 KiB
Other 0% · 40.0 KiB

~1.0 MiB of savings available

Remove unused JavaScript: 1.0 MiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-store

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-store—Never cache this response
C
Image Optimization
Action
107 images, 0 KB saveable
REVIEW
107 images, 0 KB saveable
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97814... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/RC-Ap... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/Billb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97807... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/RC-pe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/Harpe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/Spotl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/Overl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97803... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/HCP-H... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97807... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/RC-Bo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97803... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/Billb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/foote... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.sailthru.com/fss/flelv5/a0893b4f-eab... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/HCP-H... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/Billb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/Billb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/Billb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/97800... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
107 images 2.1 MB
0 oversized -0 KB
42 legacy format
66 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

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

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

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

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

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

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

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
8 fonts (197 KB)
PASS
8 fonts (197 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

197 KB total

Render-blocking

0

of 8

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 951 ms LCP 2.9 shttps://fonts.gstatic.com/s/muli/v34/7Auwp_0qiz-afTLGLQjUwkQ.woff27Auwp_0qiz-afTLGLQjUwkQ... https://fonts.gstatic.com/s/muli/v34/7Auwp_0qiz-afTLGLQjUwkQ.woff2 — 25.9 KiB — 20 ms — font-display: swaphttps://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_WamXgHlI.woff2SlGDmQSNjdsmc35JDF1K5E5... https://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_WamXgHlI.woff2 — 21.2 KiB — 17 ms — font-display: swaphttps://www.harpercollins.com/cdn/shop/t/8/assets/lmroman17-regular.otf?v=146411801800837937601589214871lmroman17-regular.otf https://www.harpercollins.com/cdn/shop/t/8/assets/lmroman17-regular.otf?v=146411801800837937601589214871 — 51.9 KiB — 38 ms — font-display: swaphttps://fonts.gstatic.com/s/ebgaramond/v32/SlGFmQSNjdsmc35JDF1K5GRwUjcdlttVFm-rI7e8QL99U6i1hGFJRvw.woff2SlGFmQSNjdsmc35JDF1K5GR... https://fonts.gstatic.com/s/ebgaramond/v32/SlGFmQSNjdsmc35JDF1K5GRwUjcdlttVFm-rI7e8QL99U6i1hGFJRvw.woff2 — 21.7 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2S6u9w4BMUTPHh7USSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2 — 13.6 KiB — 61 ms — font-display: swaphttps://fonts.gstatic.com/s/quicksand/v37/6xK-dSZaM9iE8KbpRA_LJ3z8mH9BOJvgkP8o58a-wjwxUD2GFw.woff26xK-dSZaM9iE8KbpRA_LJ3z... https://fonts.gstatic.com/s/quicksand/v37/6xK-dSZaM9iE8KbpRA_LJ3z8mH9BOJvgkP8o58a-wjwxUD2GFw.woff2 — 15.5 KiB — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 57 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 11 ms — font-display: swap
7Auwp_0qiz-afTLGLQjUwkQ... woff2 swap
Size 26 KB
Load time 20 ms
Start 692 ms
Risk FOUT — text flashes from fallback to web font
SlGDmQSNjdsmc35JDF1K5E5... woff2 swap
Size 21 KB
Load time 17 ms
Start 692 ms
Risk FOUT — text flashes from fallback to web font
lmroman17-regular.otf otf swap
Size 52 KB
Load time 38 ms
Start 983 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
SlGFmQSNjdsmc35JDF1K5GR... woff2 swap
Size 22 KB
Load time 16 ms
Start 984 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh7USSwiPGQ3... woff2 swap
Size 14 KB
Load time 61 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
6xK-dSZaM9iE8KbpRA_LJ3z... woff2 swap
Size 16 KB
Load time 7 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 57 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 11 ms
Start 6.8 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)

Fixing the unchecked items could save ~16 KB and ~32 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
641 requests over 44834ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s FCP 951 ms LCP 2.9 shttps://harpercollins.com// https://harpercollins.com/ — 301 — 1.4 KiB — 140 ms — h2https://www.harpercollins.com/www.harpercollins.com/ https://www.harpercollins.com/ — 200 — 75.3 KiB — 65 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/theme-critical.css?v=103820723354404063881744295509www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/theme-critical.css?v=103820723354404063881744295509 — 200 — 5.5 KiB — 49 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/bootstrap.min.css?v=59272444477141818901661959915www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/bootstrap.min.css?v=59272444477141818901661959915 — 200 — 20.2 KiB — 58 ms — h2https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;1,100;1,200;1,300;1,400;1,500;1,600;1,700&display=swapfonts.googleapis.com/css2?family=Po... https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;1,100;1,200;1,300;1,400;1,500;1,600;1,700&display=swap — 200 — 1.3 KiB — 107 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883 — 200 — 32.7 KiB — 58 ms — h2https://www.harpercollins.com/cdn/shopifycloud/shop-js/modules/v2/loader.init-shop-cart-sync.en.esm.jswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/shop-js/modules/v2/loader.init-shop-cart-sync.en.esm.js — 200 — 922 B — 51 ms — h2https://www.harpercollins.com/cdn/shopifycloud/portable-wallets/latest/accelerated-checkout-backwards-compat.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/portable-wallets/latest/accelerated-checkout-backwards-compat.css — 200 — 2.1 KiB — 44 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/cart-drawer.css?v=84294209388408201181747842393www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/cart-drawer.css?v=84294209388408201181747842393 — 200 — 2.5 KiB — 55 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/cart-drawer.js?v=168850978872806389831755109852www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/cart-drawer.js?v=168850978872806389831755109852 — 200 — 2.7 KiB — 51 ms — h2https://www.harpercollins.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.harpercollins.com/cdn-cgi/scrip... https://www.harpercollins.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 724 B — 12 ms — h2https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.jscdnjs.cloudflare.com/ajax/libs/popp... https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js — 200 — 7.1 KiB — 19 ms — h3https://www.harpercollins.com/cdn/shop/t/8/assets/jquery-3.4.1.min.js?v=67022563737761844971661959918www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/jquery-3.4.1.min.js?v=67022563737761844971661959918 — 200 — 29.6 KiB — 95 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/bootstrap.min.js?v=64688594030033215561661959914www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/bootstrap.min.js?v=64688594030033215561661959914 — 200 — 14.8 KiB — 59 ms — h2https://www.harpercollins.com/cdn/shopifycloud/storefront/assets/themes_support/api.jquery-7ab1a3a4.jswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/storefront/assets/themes_support/api.jquery-7ab1a3a4.js — 200 — 2.7 KiB — 69 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879 — 200 — 30.9 KiB — 83 ms — h2https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.jscdnjs.cloudflare.com/polyfill/v3/po... https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js — 200 — 758 B — 53 ms — h3https://www.harpercollins.com/cdn/shop/t/8/assets/theme.js?v=19861989155688209991776274037www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/theme.js?v=19861989155688209991776274037 — 200 — 4.2 KiB — 97 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_externals.js?v=131424953121701473521666721127www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_externals.js?v=131424953121701473521666721127 — 200 — 81.1 KiB — 219 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_config.js?v=140709743369170977321745508043www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_config.js?v=140709743369170977321745508043 — 200 — 2.1 KiB — 206 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_init.js?v=23687443935956485311591137123www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_init.js?v=23687443935956485311591137123 — 200 — 1.6 KiB — 89 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_analytics.js?v=14720739748120240401666721106www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_analytics.js?v=14720739748120240401666721106 — 200 — 1.2 KiB — 87 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_translations.js?v=4004293097325503661591137124www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_translations.js?v=4004293097325503661591137124 — 200 — 1.0 KiB — 93 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_helpers.js?v=22440440841991266081744295519www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_helpers.js?v=22440440841991266081744295519 — 200 — 1.8 KiB — 91 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_autocomplete.js?v=181092344642560060221666721114www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_autocomplete.js?v=181092344642560060221666721114 — 200 — 2.7 KiB — 101 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_facets.js?v=174319849957641233141666721121www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_facets.js?v=174319849957641233141666721121 — 200 — 1.7 KiB — 103 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_sort_orders.js?v=142261928354764455761591137097www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_sort_orders.js?v=142261928354764455761591137097 — 200 — 930 B — 97 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_instant_search.js?v=169201758373227979831772646031www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_instant_search.js?v=169201758373227979831772646031 — 200 — 8.1 KiB — 201 ms — h2https://www.harpercollins.com/checkouts/internal/preloads.js?locale=en-USwww.harpercollins.com/checkouts/int... https://www.harpercollins.com/checkouts/internal/preloads.js?locale=en-US — 200 — 2.1 KiB — 209 ms — h2https://shop.app/checkouts/internal/preloads.js?locale=en-US&shop_id=28528214050shop.app/checkouts/internal/preload... https://shop.app/checkouts/internal/preloads.js?locale=en-US&shop_id=28528214050 — 200 — 531 B — 78 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s FCP 951 ms LCP 2.9 shttps://harpercollins.com// https://harpercollins.com/ — 301 — 1.4 KiB — 140 ms — h2https://www.harpercollins.com/www.harpercollins.com/ https://www.harpercollins.com/ — 200 — 75.3 KiB — 65 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/theme-critical.css?v=103820723354404063881744295509www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/theme-critical.css?v=103820723354404063881744295509 — 200 — 5.5 KiB — 49 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/bootstrap.min.css?v=59272444477141818901661959915www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/bootstrap.min.css?v=59272444477141818901661959915 — 200 — 20.2 KiB — 58 ms — 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200 — 29.1 KiB — 133 ms — h2https://www.harpercollins.com/cdn/shop/files/9780063211872_b580ff7e-9574-4134-b899-1c116897b367_270x.jpg?v=1776482338www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780063211872_b580ff7e-9574-4134-b899-1c116897b367_270x.jpg?v=1776482338 — 200 — 28.4 KiB — 45 ms — h2https://www.harpercollins.com/cdn/shop/files/9780063397415_270x.jpg?v=1776531329www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780063397415_270x.jpg?v=1776531329 — 200 — 22.5 KiB — 46 ms — h2https://www.harpercollins.com/cdn/shop/files/9780369746917_54eb1a31-cc87-43c4-8adb-43af0841f408_270x.jpg?v=1776565442www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780369746917_54eb1a31-cc87-43c4-8adb-43af0841f408_270x.jpg?v=1776565442 — 200 — 49.4 KiB — 54 ms — h2https://www.harpercollins.com/cdn/shop/files/9780063472259_270x.jpg?v=1776597394www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780063472259_270x.jpg?v=1776597394 — 200 — 26.2 KiB — 37 ms — h2https://www.harpercollins.com/cdn/shop/files/9780063440166_8b8a38c8-d057-433b-a01c-7e501f728ffa_270x.jpg?v=1776540600www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780063440166_8b8a38c8-d057-433b-a01c-7e501f728ffa_270x.jpg?v=1776540600 — 200 — 33.0 KiB — 72 ms — h2https://www.harpercollins.com/api/collectwww.harpercollins.com/api/collect https://www.harpercollins.com/api/collect — 200 — 1.3 KiB — 88 ms — h2https://www.harpercollins.com/cdn/shop/files/9780063447554_270x.jpg?v=1776540602www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780063447554_270x.jpg?v=1776540602 — 200 — 32.8 KiB — 48 ms — h2https://www.harpercollins.com/cdn/shop/files/9780063480339_270x.jpg?v=1775584508www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780063480339_270x.jpg?v=1775584508 — 200 — 27.3 KiB — 172 ms — h2https://www.harpercollins.com/cdn/shop/t/8/assets/favicon-32x32.png?v=122351128993687689451589214864www.harpercollins.com/cdn/shop/t/8/... https://www.harpercollins.com/cdn/shop/t/8/assets/favicon-32x32.png?v=122351128993687689451589214864 — 200 — 1.7 KiB — 43 ms — h2https://www.harpercollins.com/cdn/shop/files/9780063444645_bf669e6e-67f4-4982-9be5-f8a72551e496_270x.jpg?v=1776540812www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780063444645_bf669e6e-67f4-4982-9be5-f8a72551e496_270x.jpg?v=1776540812 — 200 — 14.0 KiB — 48 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 9517ms · 1268KB · $54/mo
www.redditstatic.com
Other
Costly
Execution 3961ms
Transfer 19 KB
Monthly Cost $23/mo
Unattributable
Other
Costly
Execution 1652ms
Transfer 0 KB
Monthly Cost $9/mo
www.harpercollins.com
Other
Costly
Execution 1424ms
Transfer 75 KB
Monthly Cost $8/mo
www.gstatic.com
Other
Costly
Execution 590ms
Transfer 0 KB
Unused 49%
Monthly Cost $3/mo
www.harpercollins.com
Other
Costly
Execution 462ms
Transfer 31 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 243ms
Transfer 180 KB
Unused 33%
Monthly Cost $1/mo
script.crazyegg.com
Other
Optional
Execution 145ms
Transfer 23 KB
Monthly Cost $1/mo
www.harpercollins.com
Other
Optional
Execution 136ms
Transfer 60 KB
Unused 40%
Monthly Cost $1/mo
script.crazyegg.com
Other
Optional
Execution 118ms
Transfer 55 KB
Unused 52%
Monthly Cost $1/mo
analytics.tiktok.com
Other
Optional
Execution 108ms
Transfer 106 KB
Unused 53%
Monthly Cost $1/mo
vpodv.harpercollins.com
Other
Optional
Execution 105ms
Transfer 49 KB
Unused 56%
Monthly Cost $1/mo
www.harpercollins.com
Other
Optional
Execution 96ms
Transfer 28 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 151 KB
Unused 39%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 129 KB
Unused 47%
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 73ms
Transfer 97 KB
Unused 34%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 144 KB
Unused 42%
Monthly Cost $0/mo
sc-static.net
Other
Optional
Execution 68ms
Transfer 25 KB
Monthly Cost $0/mo
ak.sail-horizon.com
Other
Optional
Execution 57ms
Transfer 48 KB
Unused 62%
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 50ms
Transfer 48 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.redditstatic.com adds 3961ms and costs ~$23/month
  • Unattributable adds 1652ms and costs ~$9/month
  • www.harpercollins.com adds 1424ms and costs ~$8/month
  • www.gstatic.com adds 590ms and costs ~$3/month
  • www.harpercollins.com adds 462ms and costs ~$3/month
  • Google Tag Manager adds 243ms and costs ~$1/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.redditstatic.com takes 3961ms 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 1652ms 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.harpercollins.com takes 1424ms 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.gstatic.com takes 590ms 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.harpercollins.com takes 462ms 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

Google Tag Manager takes 243ms 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 script.crazyegg.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

53% 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

56% of vpodv.harpercollins.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

62% of ak.sail-horizon.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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