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https://randomhouse.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
1

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

Mobile Desktop
36
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.
62
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.

6.85 s

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

22.53 s

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

1.10 s

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.

7.04 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.

23.29 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
16
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.8 MB transferred, 102 requests
FIX
3.8 MB transferred, 102 requests
Warning::
Page weighs 5.7 MB (3.8 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 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
Warning::
102 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.79 g CO2 per page load
3.8 MB / 2.4 MB budget
3.8 MB transferred
102 requests
0.79 g CO2 per page load
Images 2.6 MiB 70%
Fonts 500.3 KiB 13%
JavaScript 495.3 KiB 13%
CSS 121.6 KiB 3%
HTML 49.1 KiB 1%
Other 3.1 KiB 0%
Other 3.0 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

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 (3.8 MiB of 3.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
102 resources · 3.8 MB · 98 KB savings available
FIX
102 resources · 3.8 MB · 98 KB savings available
Warning::
Page weight 2.8 MB over 1MB target
Got: 3.8 MB Expected: ≤ 1 MB
Info::
~98 KB of savings available
Warning::
101 third-party resources (100% of weight)
Info::
1 resources over 200KB
102 resources · 3.8 MiB · 101 third-party 2.8 MiB over 1MB target
Image 70% · 2.6 MiB
Font 13% · 500.3 KiB
JavaScript 13% · 495.3 KiB
CSS 3% · 121.6 KiB
Document 1% · 52.1 KiB
Other 0% · 213 B

~97.6 KiB of savings available

Remove unused JavaScript: 97.6 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
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
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://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/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/979821... 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://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::
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://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/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/978038... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.penguinrandomhouse.com/cover/978055... 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://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://images.penguinrandomhouse.com/cover/978059... 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.
42 images 2.6 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

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

C
JS Bundles
Action
29 scripts, 98 KB unused
REVIEW
29 scripts, 98 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
Info::
Total unused JavaScript: 98 KB
98 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://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/purl.min.js?ver=cb202604020252343 KB—✓3rd
https://www.penguinrandomhouse.com/wp-content/themes/penguinrandomhouse/js/carouselambra.min.js?ver=cb2026040202523412 KB—✗3rd
https://www.penguinrandomhouse.com/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.15 KB—✓3rd
https://www.penguinrandomhouse.com/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.142 KB—✓3rd
https://www.penguinrandomhouse.com/wp-includes/js/dist/escape-html.min.js?ver=6561a406d2d232a6fbd21 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://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js?ver=3.7.130 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

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+
JS Execution Cost
No JS execution data
PASS
No JS execution data
Info::
No significant JS execution detected
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 18.0 s 20.0 s 22.0 s FCP 6.9 s LCP 22.5 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 — 48 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 — 58 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 — 67 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 — 73 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 — 87 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 — 82 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 — 95 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 — 51 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 — 48 ms — font-display: swap
Fort-Medium.woff2 woff2 swap
Size 43 KB
Load time 48 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
Fort-Light.woff2 woff2 swap
Size 44 KB
Load time 58 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
Shift-Light.woff2 woff2 swap
Size 60 KB
Load time 67 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
Shift-Book.woff2 woff2 swap
Size 61 KB
Load time 73 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
Fort-Book.woff2 woff2 swap
Size 44 KB
Load time 87 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
Shift-BookItalic.woff2 woff2 swap
Size 63 KB
Load time 82 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
Fort-Bold.woff2 woff2 swap
Size 45 KB
Load time 95 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff woff swap
Size 80 KB
Load time 51 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Shift-Medium.woff2 woff2 swap
Size 61 KB
Load time 48 ms
Start 3.0 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 ~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
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
Network Waterfall
102 requests over 5552ms
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 FCP 6.9 s LCP 22.5 shttps://randomhouse.com// https://randomhouse.com/ — 301 — 223 B — 382 ms — http/1.1http://www.randomhouse.com/www.randomhouse.com/ http://www.randomhouse.com/ — 307 — 0 B — 2 ms — http/1.1https://www.randomhouse.com/www.randomhouse.com/ https://www.randomhouse.com/ — 200 — 7.8 KiB — 385 ms — http/1.1https://www.randomhouse.com/TSPD/08177a03a5ab200087a6f225f64232e519be522145630615c5f037b69ea06d52b7f6eb2ca8f8ab13?type=8www.randomhouse.com/TSPD/08177a03a5... https://www.randomhouse.com/TSPD/08177a03a5ab200087a6f225f64232e519be522145630615c5f037b69ea06d52b7f6eb2ca8f8ab13?type=8 — 200 — 86.5 KiB — 370 ms — http/1.1https://www.randomhouse.com/TSPD/08177a03a5ab200087a6f225f64232e519be522145630615c5f037b69ea06d52b7f6eb2ca8f8ab13?type=12www.randomhouse.com/TSPD/08177a03a5... https://www.randomhouse.com/TSPD/08177a03a5ab200087a6f225f64232e519be522145630615c5f037b69ea06d52b7f6eb2ca8f8ab13?type=12 — 200 — 37.2 KiB — 467 ms — http/1.1data:image/jpg;base64,/9j/4AAQSkZJRgABAQEAAQABAAD/2wBDABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkzO…data:image/jpg;base64,/9j/4AAQSkZJR... data:image/jpg;base64,/9j/4AAQSkZJRgABAQEAAQABAAD/2wBDABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkzO… — 200 — 0 B — 1 ms — datahttps://www.randomhouse.com/TSPD/08177a03a5ab28006df229a685c78fca4a02b26d571b8811b5c6eb07a9f7dab25652209d9d61c7553f8b81ab0d71b6b1?type=13www.randomhouse.com/TSPD/08177a03a5... https://www.randomhouse.com/TSPD/08177a03a5ab28006df229a685c78fca4a02b26d571b8811b5c6eb07a9f7dab25652209d9d61c7553f8b81ab0d71b6b1?type=13 — 200 — 789 B — 101 ms — http/1.1https://www.randomhouse.com/www.randomhouse.com/ https://www.randomhouse.com/ — 301 — 677 B — 99 ms — http/1.1https://www.penguinrandomhouse.com/www.penguinrandomhouse.com/ https://www.penguinrandomhouse.com/ — 200 — 41.3 KiB — 21 ms — 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