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https://harpercollins.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
25
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.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

11.83 s

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

23.67 s

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

5.19 s

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

0.030

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

14.88 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.

33.52 s

Page Load Progression

1.0 s
2.0 s
3.0 s
4.0 s
5.0 s
6.0 s
7.0 s
8.0 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
6.5 MB transferred, 589 requests
FIX
6.5 MB transferred, 589 requests
Critical::
Page weighs 14.5 MB (6.5 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 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Info::
Fonts are 298 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 298 KB
Warning::
589 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.4 g CO2 per page load
6.5 MB / 2.4 MB budget
6.5 MB transferred
589 requests
1.4 g CO2 per page load
JavaScript 2.6 MiB 40%
Images 1.6 MiB 25%
Other 829.4 KiB 12%
Other 826.8 KiB 12%
Fonts 298.2 KiB 4%
HTML 210.1 KiB 3%
CSS 136.3 KiB 2%
Other 11.2 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (6.5 MiB of 6.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
23195ms total JS execution
FIX
23195ms total JS execution
Warning::
Unattributable: 5611ms CPU time
Warning::
https://www.harpercollins.com/: 3806ms CPU time
Warning::
https://www.redditstatic.com/ads/pixel.js: 1389ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 1259ms CPU time
Warning::
https://www.harpercollins.com/cdn/shop/t/8/assets/...: 1023ms CPU time
Warning::
Third-party scripts: 23195ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 25% Style & Layout 14% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
Unattributable5611ms1045ms0ms3rd
https://www.harpercollins.com/3806ms733ms49ms3rd
https://www.redditstatic.com/ads/pixel.js1389ms1188ms7ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js1259ms1054ms94ms3rd
https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=703550537510335161715892148791023ms238ms12ms3rd
https://dx.mountain.com/spx?dxver=4.0.0&shaid=32683&tdr=&plh=https%3A%2F%2Fwww.harpercollins.com%2F&cb=87771835519606020term=value952ms874ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3823ms682ms68ms3rd
https://www.harpercollins.com/cdn/wpm/b5153dfa3wa14e0a32p72aa89e7m94579b79m.js774ms444ms19ms3rd
https://www.harpercollins.com/cdn/shopifycloud/perf-kit/shopify-perf-kit-3.3.1.min.js634ms141ms7ms3rd
https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js626ms576ms7ms3rd

Showing top 10 of 46 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...: 60 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.0 MB
1042 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 KB60 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3180 KB60 KB (33%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-BWH2Y83W11&cx=c&gtm=4e64h1151 KB60 KB (39%)✓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 KB48 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
589 resources · 6.5 MB · 1.0 MB savings available
FIX
589 resources · 6.5 MB · 1.0 MB savings available
Warning::
Page weight 5.5 MB over 1MB target
Got: 6.5 MB Expected: ≤ 1 MB
Info::
~1.0 MB of savings available
Warning::
588 third-party resources (100% of weight)
Info::
3 resources over 200KB
589 resources · 6.5 MiB · 588 third-party 5.5 MiB over 1MB target
JavaScript 52% · 3.4 MiB
Image 25% · 1.6 MiB
Document 15% · 1023.4 KiB
Font 4% · 298.2 KiB
CSS 3% · 177.5 KiB
Other 1% · 39.3 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
54 images, 0 KB saveable
REVIEW
54 images, 0 KB saveable
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/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/TileA... 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/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/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.
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/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/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/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/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/Spotl... 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/New_i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harpercollins.com/cdn/shop/files/HCcom... 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/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/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/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/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/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/files/Tile3... 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/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/TileA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
54 images 1.6 MB
0 oversized -0 KB
19 legacy format
33 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

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

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
10 fonts (298 KB)
PASS
10 fonts (298 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

298 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
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 FCP 11.8 s LCP 23.7 shttps://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_Wa-XgA.woff2SlGDmQSNjdsmc35JDF1K5E5... https://fonts.gstatic.com/s/ebgaramond/v32/SlGDmQSNjdsmc35JDF1K5E55YMjF_7DPuGi-6_RkBI9_Wa-XgA.woff2 — 21.2 KiB — 18 ms — font-display: swaphttps://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://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 — 52.0 KiB — 46 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2S6u9w4BMUTPHh7USSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2 — 13.6 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 18 ms — font-display: swaphttps://fonts.gstatic.com/s/ebgaramond/v32/SlGFmQSNjdsmc35JDF1K5GRwUjcdlttVFm-rI7e8QL99U6i1gmFJ.woff2SlGFmQSNjdsmc35JDF1K5GR... https://fonts.gstatic.com/s/ebgaramond/v32/SlGFmQSNjdsmc35JDF1K5GRwUjcdlttVFm-rI7e8QL99U6i1gmFJ.woff2 — 21.7 KiB — 25 ms — font-display: swaphttps://www.harpercollins.com/cdn/shop/t/8/assets/algolia_dependency_fontawesome-webfont.woff2?v=4.4.0algolia_dependency_font... https://www.harpercollins.com/cdn/shop/t/8/assets/algolia_dependency_fontawesome-webfont.woff2?v=4.4.0 — 64.0 KiB — 65 ms — font-display: swaphttps://fonts.gstatic.com/s/quicksand/v37/6xK-dSZaM9iE8KbpRA_LJ3z8mH9BOJvgkP8o58a-wjw3UD0.woff26xK-dSZaM9iE8KbpRA_LJ3z... https://fonts.gstatic.com/s/quicksand/v37/6xK-dSZaM9iE8KbpRA_LJ3z8mH9BOJvgkP8o58a-wjw3UD0.woff2 — 15.5 KiB — 10 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 38 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 9 ms — font-display: swap
SlGDmQSNjdsmc35JDF1K5E5... woff2 swap
Size 21 KB
Load time 18 ms
Start 825 ms
Risk FOUT — text flashes from fallback to web font
7Auwp_0qiz-afTLGLQjUwkQ... woff2 swap
Size 26 KB
Load time 20 ms
Start 825 ms
Risk FOUT — text flashes from fallback to web font
lmroman17-regular.otf otf swap
Size 52 KB
Load time 46 ms
Start 826 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
S6u9w4BMUTPHh7USSwiPGQ3... woff2 swap
Size 14 KB
Load time 16 ms
Start 826 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 18 ms
Start 827 ms
Risk FOUT — text flashes from fallback to web font
SlGFmQSNjdsmc35JDF1K5GR... woff2 swap
Size 22 KB
Load time 25 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
algolia_dependency_font... woff2 swap
Size 64 KB
Load time 65 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
6xK-dSZaM9iE8KbpRA_LJ3z... woff2 swap
Size 15 KB
Load time 10 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 38 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 9 ms
Start 6.7 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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
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
589 requests over 8079ms
INFO
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https://connect.facebook.net/signals/config/1115990331856782?v=2.9.303&r=stable&domain=www.harpercollins.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%2C168 — 200 — 48.1 KiB — 532 ms — h3https://pixel-config.reddit.com/pixels/t2_ee3m052f/configpixel-config.reddit.com/pixels/t2_e... https://pixel-config.reddit.com/pixels/t2_ee3m052f/config — 200 — 243 B — 404 ms — h2https://alb.reddit.com/rp.gif?ts=1776813402813&id=t2_ee3m052f&event=PageVisit&m.itemCount=&m.value=&m.valueDecimal=&m.currency=&m.transactionId=&m.customEventName=&m.products=&m.conversionId=0dae4384b584940a34b8ae4b5293dedd533a4eecae8d9fba17a2d33ce104df88&uuid=8f078471-b1e5-4ba8-aa1c-dab34a2960b9&aaid=&external_id=4eed1990628bca89e6c7e8fa3752744229b0230389fd3eeb807d9c4596dde41d&idfa=&integration=reddit&partner=&partner_version=&opt_out=0&sh=823&sw=412&v=rdt_f3936046&dpm=&dpcc=&dprc=alb.reddit.com/rp.gif?ts=1776813402... https://alb.reddit.com/rp.gif?ts=1776813402813&id=t2_ee3m052f&event=PageVisit&m.itemCount=&m.value=&m.valueDecimal=&m.currency=&m.transactionId=&m.customEventName=&m.products=&m.conversionId=0dae4384b584940a34b8ae4b5293dedd533a4eecae8d9fba17a2d33ce104df88&uuid=8f078471-b1e5-4ba8-aa1c-dab34a2960b9&aaid=&external_id=4eed1990628bca89e6c7e8fa3752744229b0230389fd3eeb807d9c4596dde41d&idfa=&integration=reddit&partner=&partner_version=&opt_out=0&sh=823&sw=412&v=rdt_f3936046&dpm=&dpcc=&dprc= — 200 — 666 B — 407 ms — h2https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMg.jsanalytics.tiktok.com/i18n/pixel/sta... https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMg.js — 200 — 106.2 KiB — 530 ms — 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https://www.google-analytics.com/g/collect?v=2&tid=G-BWH2Y83W11&gtm=45je64h1v889081356z8831924139za20gzb831924139zd831924139&_p=1776813400721&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=911221457.1776813403&frm=0&pscdl=noapi&rcb=1&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266400~117384405~118128922~118463261&uid=b254e166-0B53-4909-2793-291F9EFED605&sid=1776813402&sct=1&seg=0&dl=https%3A%2F%2Fwww.harpercollins.com%2F&dt=HarperCollins%20Publishers%3A%20World-Leading%20Book%20Publisher&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.visitor_type=guest&tfd=3716 — 204 — 553 B — 888 ms — 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h2https://rp.liadm.com/j?dtstmp=1776813402662&aid=a-0172&se=e30&duid=9320bff2ce72--01kps59t1tycacb879epz8253r&tv=v3.14.0&pu=https%3A%2F%2Fwww.harpercollins.com%2F&ext__shopify_y=b254e166-0B53-4909-2793-291F9EFED605&ext__fbp=fb.1.1776813402085.6356841781&wpn=lc-bundle&wpv=v3.14.0&cd=.harpercollins.com&pv=5829cc59-f93c-492d-99bd-525b21f494bb&n3pc=truerp.liadm.com/j?dtstmp=1776813402662... https://rp.liadm.com/j?dtstmp=1776813402662&aid=a-0172&se=e30&duid=9320bff2ce72--01kps59t1tycacb879epz8253r&tv=v3.14.0&pu=https%3A%2F%2Fwww.harpercollins.com%2F&ext__shopify_y=b254e166-0B53-4909-2793-291F9EFED605&ext__fbp=fb.1.1776813402085.6356841781&wpn=lc-bundle&wpv=v3.14.0&cd=.harpercollins.com&pv=5829cc59-f93c-492d-99bd-525b21f494bb&n3pc=true — 200 — 266 B — 124 ms — h2https://instafeed.nfcube.com/cdn/instafeed-17.2.0b024.cssinstafeed.nfcube.com/cdn/instafeed-... https://instafeed.nfcube.com/cdn/instafeed-17.2.0b024.css — 200 — 11.0 KiB — 132 ms — h3https://instafeed.nfcube.com/feed/v6?limit=6&account=harpercollins-us.myshopify.com&fu=0&fid=0&hash=60e3494c1f058a43878cccf44170de19&locale=en&handle=instafeed.nfcube.com/feed/v6?limit=... https://instafeed.nfcube.com/feed/v6?limit=6&account=harpercollins-us.myshopify.com&fu=0&fid=0&hash=60e3494c1f058a43878cccf44170de19&locale=en&handle= — 200 — 9.2 KiB — 164 ms — 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— 200 — 1.3 KiB — 209 ms — h2https://insight.adsrvr.org/track/realtimeconversioninsight.adsrvr.org/track/realtimeco... https://insight.adsrvr.org/track/realtimeconversion — 200 — 354 B — 85 ms — h2https://googleads.g.doubleclick.net/pagead/viewthroughconversion/16769633610/?random=1776813403434&cv=11&fst=1776813403434&bg=ffffff&guid=ON&async=1&gtm=45be64h1v9215232399z8831924139za20gzb831924139zd831924139xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938465~115938469~117266401&u_w=412&u_h=823&url=https%3A%2F%2Fwww.harpercollins.com%2F&rcb=10&frm=0&tiba=HarperCollins%20Publishers%3A%20World-Leading%20Book%20Publisher&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=746126858.1776813401&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&_tu=CA&data=ecomm_pagetype%3Dhome&rfmt=3&fmt=4googleads.g.doubleclick.net/pagead/... 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16.7 KiB — 46 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/esm-browser-v4.BKrj-4V8.jswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/esm-browser-v4.BKrj-4V8.js — 200 — 999 B — 47 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/utilities-shipping-options.Bt4c_51y.jswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/utilities-shipping-options.Bt4c_51y.js — 200 — 2.2 KiB — 59 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/ExtensionsInner.D1BM5crT.jswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/ExtensionsInner.D1BM5crT.js — 200 — 12.0 KiB — 48 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/adapter-PaymentButtons.vvFS9jEa.jswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/adapter-PaymentButtons.vvFS9jEa.js — 200 — 2.0 KiB — 53 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/app.fH9d1Lew.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/app.fH9d1Lew.css — 200 — 2.5 KiB — 45 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/FullScreenBackground.Dr-4Ca3z.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/FullScreenBackground.Dr-4Ca3z.css — 200 — 7.4 KiB — 47 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/useHasOrdersFromMultipleShops.C-q6IUI3.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/useHasOrdersFromMultipleShops.C-q6IUI3.css — 200 — 23.3 KiB — 64 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/VatNumberValidationField.LuHtqm8n.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/VatNumberValidationField.LuHtqm8n.css — 200 — 2.8 KiB — 60 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/useShopPayButtonClassName.BrcQzLuH.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/useShopPayButtonClassName.BrcQzLuH.css — 200 — 899 B — 48 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/VaultedPayment.OxMVm7u-.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/VaultedPayment.OxMVm7u-.css — 200 — 736 B — 42 ms — h2https://www.harpercollins.com/cdn/shop/files/BillboardBG-ReleaseMe.png?v=1775581776www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/BillboardBG-ReleaseMe.png?v=1775581776 — 200 — 19.6 KiB — 44 ms — h2https://www.harpercollins.com/cdn/shop/files/BillboardOverlay-ReleaseMe_780x.png?v=1775581772www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/BillboardOverlay-ReleaseMe_780x.png?v=1775581772 — 200 — 93.1 KiB — 49 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/PickupPointCarrierLogo.cbVP6Hp_.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/PickupPointCarrierLogo.cbVP6Hp_.css — 200 — 786 B — 41 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/StackedMerchandisePreview.D6OuIVjc.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/StackedMerchandisePreview.D6OuIVjc.css — 200 — 933 B — 50 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/RuntimeExtension.DWkDBM73.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/RuntimeExtension.DWkDBM73.css — 200 — 749 B — 38 ms — h2https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/AnnouncementRuntimeExtensions.V0VYEO4K.csswww.harpercollins.com/cdn/shopifycl... https://www.harpercollins.com/cdn/shopifycloud/checkout-web/assets/c1/assets/AnnouncementRuntimeExtensions.V0VYEO4K.css — 200 — 1.2 KiB — 43 ms — h2https://cdn.shopify.com/s/files/1/0285/2821/4050/files/hc-logo-checkout_x320.png?v=1614768524cdn.shopify.com/s/files/1/0285/2821... https://cdn.shopify.com/s/files/1/0285/2821/4050/files/hc-logo-checkout_x320.png?v=1614768524 — 200 — 9.9 KiB — 30 ms — h2https://www.harpercollins.com/cdn/shop/files/9780063512955_540x.jpg?v=1775768828www.harpercollins.com/cdn/shop/file... https://www.harpercollins.com/cdn/shop/files/9780063512955_540x.jpg?v=1775768828 — 200 — 111.5 KiB — 44 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 23195ms · 1764KB · $133/mo
Unattributable
Other
Costly
Execution 5611ms
Transfer 0 KB
Monthly Cost $32/mo
www.harpercollins.com
Other
Costly
Execution 3806ms
Transfer 75 KB
Monthly Cost $22/mo
www.redditstatic.com
Other
Costly
Execution 1389ms
Transfer 19 KB
Monthly Cost $8/mo
www.gstatic.com
Other
Costly
Execution 1259ms
Transfer 0 KB
Unused 49%
Monthly Cost $7/mo
www.harpercollins.com
Other
Costly
Execution 1023ms
Transfer 31 KB
Monthly Cost $6/mo
dx.mountain.com
Other
Costly
Execution 952ms
Transfer 7 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 823ms
Transfer 180 KB
Unused 33%
Monthly Cost $5/mo
www.harpercollins.com
Other
Costly
Execution 774ms
Transfer 60 KB
Unused 42%
Monthly Cost $4/mo
www.harpercollins.com
Other
Costly
Execution 634ms
Transfer 21 KB
Monthly Cost $4/mo
script.crazyegg.com
Other
Costly
Execution 626ms
Transfer 23 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 489ms
Transfer 151 KB
Unused 39%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 485ms
Transfer 144 KB
Unused 42%
Monthly Cost $3/mo
vpodv.harpercollins.com
Other
Costly
Execution 412ms
Transfer 49 KB
Unused 56%
Monthly Cost $2/mo
script.crazyegg.com
Other
Costly
Execution 355ms
Transfer 55 KB
Unused 52%
Monthly Cost $2/mo
na.shgcdn3.com
Other
Costly
Execution 313ms
Transfer 27 KB
Monthly Cost $2/mo
www.harpercollins.com
Other
Costly
Execution 300ms
Transfer 28 KB
Monthly Cost $2/mo
sc-static.net
Other
Costly
Execution 295ms
Transfer 25 KB
Monthly Cost $2/mo
analytics.tiktok.com
Other
Costly
Execution 292ms
Transfer 106 KB
Unused 53%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Costly
Execution 238ms
Transfer 97 KB
Unused 34%
Monthly Cost $1/mo
b-code.liadm.com
Other
Costly
Execution 223ms
Transfer 47 KB
Unused 43%
Monthly Cost $1/mo
Facebook Pixel
Advertising
Costly
Execution 217ms
Transfer 48 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Costly
Execution 210ms
Transfer 129 KB
Unused 47%
Monthly Cost $1/mo
www.harpercollins.com
Other
Optional
Execution 196ms
Transfer 26 KB
Monthly Cost $1/mo
widgetic.com
Other
Optional
Execution 190ms
Transfer 16 KB
Monthly Cost $1/mo
www.harpercollins.com
Other
Optional
Execution 167ms
Transfer 81 KB
Unused 73%
Monthly Cost $1/mo
www.harpercollins.com
Other
Optional
Execution 165ms
Transfer 4 KB
Monthly Cost $1/mo
js.adsrvr.org
Other
Optional
Execution 154ms
Transfer 12 KB
Monthly Cost $1/mo
static.cloudflareinsights.com
Other
Optional
Execution 130ms
Transfer 0 KB
Monthly Cost $1/mo
ak.sail-horizon.com
Other
Optional
Execution 128ms
Transfer 48 KB
Unused 62%
Monthly Cost $1/mo
s.pinimg.com
Other
Optional
Execution 125ms
Transfer 27 KB
Monthly Cost $1/mo
link.harpercollins.com
Other
Optional
Execution 123ms
Transfer 6 KB
Monthly Cost $1/mo
www.harpercollins.com
Other
Optional
Execution 102ms
Transfer 3 KB
Monthly Cost $1/mo
cdn.nfcube.com
Other
Optional
Execution 99ms
Transfer 24 KB
Monthly Cost $1/mo
www.harpercollins.com
Other
Optional
Execution 91ms
Transfer 30 KB
Monthly Cost $1/mo
gs.mountain.com
Other
Optional
Execution 80ms
Transfer 0 KB
Monthly Cost $0/mo
script.crazyegg.com
Other
Optional
Execution 80ms
Transfer 3 KB
Monthly Cost $0/mo
www.harpercollins.com
Other
Optional
Execution 73ms
Transfer 1 KB
Monthly Cost $0/mo
www.harpercollins.com
Other
Optional
Execution 72ms
Transfer 21 KB
Monthly Cost $0/mo
px.mountain.com
Other
Optional
Execution 71ms
Transfer 1 KB
Monthly Cost $0/mo
www.harpercollins.com
Other
Optional
Execution 69ms
Transfer 23 KB
Monthly Cost $0/mo
www.harpercollins.com
Other
Optional
Execution 67ms
Transfer 33 KB
Monthly Cost $0/mo
Pinterest Tag
Advertising
Optional
Execution 60ms
Transfer 4 KB
Monthly Cost $0/mo
analytics.tiktok.com
Other
Optional
Execution 59ms
Transfer 40 KB
Monthly Cost $0/mo
cdn.attn.tv
Other
Optional
Execution 57ms
Transfer 0 KB
Monthly Cost $0/mo
Bing UET
Advertising
Optional
Execution 56ms
Transfer 15 KB
Monthly Cost $0/mo
shopify-webhooks.sailthru.com
Other
Optional
Execution 55ms
Transfer 25 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 5611ms and costs ~$32/month
  • www.harpercollins.com adds 3806ms and costs ~$22/month
  • www.redditstatic.com adds 1389ms and costs ~$8/month
  • www.gstatic.com adds 1259ms and costs ~$7/month
  • www.harpercollins.com adds 1023ms and costs ~$6/month
  • dx.mountain.com adds 952ms and costs ~$5/month
  • Google Tag Manager adds 823ms and costs ~$5/month
  • www.harpercollins.com adds 774ms and costs ~$4/month
  • www.harpercollins.com adds 634ms and costs ~$4/month
  • script.crazyegg.com adds 626ms and costs ~$4/month
  • Google Tag Manager adds 489ms and costs ~$3/month
  • Google Tag Manager adds 485ms and costs ~$3/month
  • vpodv.harpercollins.com adds 412ms and costs ~$2/month
  • script.crazyegg.com adds 355ms and costs ~$2/month
  • na.shgcdn3.com adds 313ms and costs ~$2/month
  • www.harpercollins.com adds 300ms and costs ~$2/month
  • sc-static.net adds 295ms and costs ~$2/month
  • analytics.tiktok.com adds 292ms and costs ~$2/month
  • Facebook Pixel adds 238ms and costs ~$1/month
  • b-code.liadm.com adds 223ms and costs ~$1/month
  • Facebook Pixel adds 217ms and costs ~$1/month
  • Google Tag Manager adds 210ms 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

Unattributable takes 5611ms 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 3806ms 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.redditstatic.com takes 1389ms 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 1259ms 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 1023ms 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

dx.mountain.com takes 952ms 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 823ms 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 774ms 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 634ms 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

script.crazyegg.com takes 626ms 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 489ms 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 485ms 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

vpodv.harpercollins.com takes 412ms 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

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

script.crazyegg.com takes 355ms 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

na.shgcdn3.com takes 313ms 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 300ms 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

sc-static.net takes 295ms 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

analytics.tiktok.com takes 292ms 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

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

Facebook Pixel takes 238ms 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

b-code.liadm.com takes 223ms 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

Facebook Pixel takes 217ms 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 210ms 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

73% of www.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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