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https://penguinrandomhouse.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
3
PASS
7
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.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

4.15 s

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

15.98 s

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

69 ms

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

0.000

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

5.76 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.

17.17 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 95 requests
FIX
2.9 MB transferred, 95 requests
Warning::
Page weighs 4.6 MB (2.9 MB transferred)
Warning::
Images are 1.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.9 MB
Info::
Fonts are 500 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 500 KB
Info::
95 HTTP requests
Info::
Estimated 0.61 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
95 requests
0.61 g CO2 per page load
Images 1.9 MiB 65%
Fonts 500.3 KiB 17%
JavaScript 369.1 KiB 12%
CSS 121.6 KiB 4%
HTML 41.2 KiB 1%
Other 2.3 KiB 0%
Other 2.3 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

Why this matters

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

Source: web.dev

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2162ms total JS execution
FIX
2162ms total JS execution
Warning::
https://www.penguinrandomhouse.com/: 563ms CPU time
Warning::
Unattributable: 464ms CPU time
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/3.7.1...: 439ms CPU time
Warning::
https://www.penguinrandomhouse.com/wp-content/them...: 287ms CPU time
Info::
https://www.penguinrandomhouse.com/wp-content/them...: 162ms CPU time
Warning::
Third-party scripts: 2162ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 29% Style & Layout 17% Script Parsing & Compilation 8% Parse HTML & CSS 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.penguinrandomhouse.com/563ms38ms11ms3rd
Unattributable464ms13ms0ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js?ver=3.7.1439ms230ms9ms3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/global.min.js?ver=cb20260402025234287ms203ms36ms3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/sitehome.min.js?ver=cb20260402025234162ms106ms6ms3rd
https://tags.tiqcdn.com/utag/random/rhcorp-prh/prod/utag.js105ms72ms17ms3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/account.min.js?ver=cb2026040202523483ms9ms73ms3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/build/newsletter.js?ver=cb2026040202523458ms54ms1ms3rd
D
Page Weight Inventory
Action
95 resources · 2.9 MB · 118 KB savings available
FIX
95 resources · 2.9 MB · 118 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~118 KB of savings available
Warning::
94 third-party resources (100% of weight)
Info::
2 resources over 200KB
95 resources · 2.9 MiB · 94 third-party 1.9 MiB over 1MB target
Image 65% · 1.9 MiB
Font 17% · 500.3 KiB
JavaScript 12% · 369.1 KiB
CSS 4% · 121.6 KiB
Document 1% · 42.6 KiB
Other 0% · 337 B

~118.3 KiB of savings available

Remove unused JavaScript: 118.3 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
41 images, 0 KB saveable
REVIEW
41 images, 0 KB saveable
Warning::
https://assets.penguinrandomhouse.com/wp-content/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.penguinrandomhouse.com/wp-content/them... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.penguinrandomhouse.com/cover/978052... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.penguinrandomhouse.com/cover/978052... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.penguinrandomhouse.com/cover/978067... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/wp-content/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.penguinrandomhouse.com/cover/978059... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.penguinrandomhouse.com/wp-content/them... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.penguinrandomhouse.com/wp-content/them... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/category-ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/category-ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/category-ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/wp-content/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/wp-content/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.penguinrandomhouse.com/wp-content/them... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.penguinrandomhouse.com/wp-content/them... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/category-ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/category-ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/category-ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/category-ima... 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.penguinrandomhouse.com/wp-content/them... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.penguinrandomhouse.com/wp-content/them... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.penguinrandomhouse.com/category-ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.penguinrandomhouse.com/cover/978030... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
41 images 1.9 MB
0 oversized -0 KB
40 legacy format
25 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

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

C
JS Bundles
Action
27 scripts, 118 KB unused
REVIEW
27 scripts, 118 KB unused
Warning::
https://www.penguinrandomhouse.com/wp-content/them...: 56 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.penguinrandomhouse.com/wp-content/them...: unminified — 22 KB could be saved
Warning::
https://www.penguinrandomhouse.com/wp-content/them...: 41 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.penguinrandomhouse.com/wp-content/them...: unminified — 13 KB could be saved
Warning::
https://tags.tiqcdn.com/utag/random/rhcorp-prh/pro...: 21 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 118 KB
118 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/global.min.js?ver=cb2026040202523475 KB56 KB (76%)✗3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/account.min.js?ver=cb2026040202523447 KB41 KB (88%)✗3rd
https://tags.tiqcdn.com/utag/random/rhcorp-prh/prod/utag.js49 KB21 KB (43%)✓3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/purl.min.js?ver=cb202604020252343 KB—✓3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/swipe.min.js?ver=cb202604020252342 KB—✓3rd
https://www.penguinrandomhouse.com/wp-includes/js/dist/element.min.js?ver=a4eeeadd23c0d7ab1d2d5 KB—✓3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/build/newsletter.js?ver=cb202604020252344 KB—✓3rd
https://www.penguinrandomhouse.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.140 KB—✓3rd
https://www.penguinrandomhouse.com/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.14 KB—✓3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/minicart.js?ver=cb202604020252349 KB—✗3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
9 fonts (500 KB)
PASS
9 fonts (500 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

500 KB total

Render-blocking

0

of 9

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 FCP 4.2 s LCP 16.0 shttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Medium.woff2Fort-Medium.woff2 https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Medium.woff2 — 43.4 KiB — 18 ms — font-display: swaphttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Light.woff2Fort-Light.woff2 https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Light.woff2 — 43.9 KiB — 20 ms — font-display: swaphttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-Light.woff2Shift-Light.woff2 https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-Light.woff2 — 60.2 KiB — 9 ms — font-display: swaphttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-Book.woff2Shift-Book.woff2 https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-Book.woff2 — 61.3 KiB — 79 ms — font-display: swaphttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Book.woff2Fort-Book.woff2 https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Book.woff2 — 43.5 KiB — 31 ms — font-display: swaphttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-BookItalic.woff2Shift-BookItalic.woff2 https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-BookItalic.woff2 — 62.9 KiB — 35 ms — font-display: swaphttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-Medium.woff2Shift-Medium.woff2 https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-Medium.woff2 — 60.7 KiB — 21 ms — font-display: swaphttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/fontawesome-webfont.woff?v=4.4.0fontawesome-webfont.woff https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/fontawesome-webfont.woff?v=4.4.0 — 79.7 KiB — 25 ms — font-display: swaphttps://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Bold.woff2Fort-Bold.woff2 https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Bold.woff2 — 44.7 KiB — 24 ms — font-display: swap
Fort-Medium.woff2 woff2 swap
Size 43 KB
Load time 18 ms
Start 473 ms
Risk FOUT — text flashes from fallback to web font
Fort-Light.woff2 woff2 swap
Size 44 KB
Load time 20 ms
Start 474 ms
Risk FOUT — text flashes from fallback to web font
Shift-Light.woff2 woff2 swap
Size 60 KB
Load time 9 ms
Start 475 ms
Risk FOUT — text flashes from fallback to web font
Shift-Book.woff2 woff2 swap
Size 61 KB
Load time 79 ms
Start 476 ms
Risk FOUT — text flashes from fallback to web font
Fort-Book.woff2 woff2 swap
Size 44 KB
Load time 31 ms
Start 476 ms
Risk FOUT — text flashes from fallback to web font
Shift-BookItalic.woff2 woff2 swap
Size 63 KB
Load time 35 ms
Start 477 ms
Risk FOUT — text flashes from fallback to web font
Shift-Medium.woff2 woff2 swap
Size 61 KB
Load time 21 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff woff swap
Size 80 KB
Load time 25 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Fort-Bold.woff2 woff2 swap
Size 45 KB
Load time 24 ms
Start 688 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~24 KB and ~48 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
1
prefetch
—

7 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
95 requests over 3278ms
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 FCP 4.2 s LCP 16.0 shttps://penguinrandomhouse.com// https://penguinrandomhouse.com/ — 301 — 124 B — 404 ms — http/1.0https://www.penguinrandomhouse.com/www.penguinrandomhouse.com/ https://www.penguinrandomhouse.com/ — 200 — 41.2 KiB — 52 ms — h2https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Medium.woff2www.penguinrandomhouse.com/wp-conte... https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Medium.woff2 — 200 — 43.4 KiB — 18 ms — h2https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Light.woff2www.penguinrandomhouse.com/wp-conte... https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Fort-Light.woff2 — 200 — 43.9 KiB — 20 ms — h2https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/fonts/Shift-Light.woff2www.penguinrandomhouse.com/wp-conte... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 2162ms · 260KB · $12/mo
www.penguinrandomhouse.com
Other
Costly
Execution 563ms
Transfer 41 KB
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 464ms
Transfer 0 KB
Monthly Cost $3/mo
ajax.googleapis.com
Other
Costly
Execution 439ms
Transfer 30 KB
Monthly Cost $3/mo
www.penguinrandomhouse.com
Other
Costly
Execution 287ms
Transfer 75 KB
Unused 76%
Monthly Cost $2/mo
www.penguinrandomhouse.com
Other
Optional
Execution 162ms
Transfer 13 KB
Monthly Cost $1/mo
tags.tiqcdn.com
Other
Optional
Execution 105ms
Transfer 49 KB
Unused 43%
Monthly Cost $1/mo
www.penguinrandomhouse.com
Other
Optional
Execution 83ms
Transfer 47 KB
Unused 88%
Monthly Cost $0/mo
www.penguinrandomhouse.com
Other
Optional
Execution 58ms
Transfer 4 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.penguinrandomhouse.com adds 563ms and costs ~$3/month
  • Unattributable adds 464ms and costs ~$3/month
  • ajax.googleapis.com adds 439ms and costs ~$3/month
  • www.penguinrandomhouse.com adds 287ms and costs ~$2/month

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

Why this matters

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

Learn more ▾

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

Source: web.dev

www.penguinrandomhouse.com takes 563ms 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 464ms 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

ajax.googleapis.com takes 439ms 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.penguinrandomhouse.com takes 287ms 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

76% of www.penguinrandomhouse.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

88% of www.penguinrandomhouse.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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