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https://penguin.co.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
54
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

2.33 s

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

6.36 s

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

777 ms

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

0.057

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

3.82 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.

8.93 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
D
Page Weight Budget
Action
2.1 MB transferred, 99 requests
FIX
2.1 MB transferred, 99 requests
Info::
Page weighs 4.7 MB (2.1 MB transferred)
Warning::
JavaScript is 611 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 611 KB
Info::
99 HTTP requests
Info::
Estimated 0.45 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
99 requests
0.45 g CO2 per page load
Images 635.5 KiB 29%
JavaScript 611.5 KiB 28%
Other 563.4 KiB 26%
Fonts 190.4 KiB 9%
HTML 68.2 KiB 3%
CSS 66.8 KiB 3%
Other 34.1 KiB 2%
Other 2.1 KiB 0%
Other 1.2 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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 (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3699ms total JS execution
FIX
3699ms total JS execution
Warning::
https://www.penguin.co.uk/_next/static/chunks/fram...: 1030ms CPU time
Warning::
https://www.penguin.co.uk/: 1021ms CPU time
Warning::
Unattributable: 674ms CPU time
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 344ms CPU time
Info::
https://www.penguin.co.uk/_next/static/chunks/page...: 170ms CPU time
Warning::
Third-party scripts: 3699ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 24% Style & Layout 15% Rendering 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.penguin.co.uk/_next/static/chunks/framework-945b357d4a851f4b.js1030ms923ms12ms3rd
https://www.penguin.co.uk/1021ms21ms2ms3rd
Unattributable674ms119ms0ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202602.1.0/otBannerSdk.js344ms210ms39ms3rd
https://www.penguin.co.uk/_next/static/chunks/pages/_app-7349391626bb9263.js170ms137ms32ms3rd
https://www.penguin.co.uk/newrelicmonitoring.min.js151ms81ms3ms3rd
https://www.penguin.co.uk/_next/static/chunks/pages/index-6e6ac7810b55ebd6.js132ms131ms0ms3rd
https://www.penguin.co.uk/_next/static/chunks/main-fd62e7a6acd89978.js91ms79ms8ms3rd
https://www.penguin.co.uk/_next/static/chunks/1073-d6fd4d7618df984c.js86ms4ms12ms3rd
D
Page Weight Inventory
Action
99 resources · 2.1 MB · 237 KB savings available
FIX
99 resources · 2.1 MB · 237 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~237 KB of savings available
Warning::
98 third-party resources (100% of weight)
99 resources · 2.1 MiB · 98 third-party 1.1 MiB over 1MB target
JavaScript 31% · 665.9 KiB
Image 29% · 638.1 KiB
Other 24% · 531.3 KiB
Font 9% · 190.4 KiB
CSS 4% · 79.3 KiB
Document 3% · 68.2 KiB

~237.4 KiB of savings available

Remove unused JavaScript: 237.4 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

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

B
Image Optimization
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Info::
All images are well-optimized
24 images 635 KB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
35 scripts, 237 KB unused
REVIEW
35 scripts, 237 KB unused
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 68 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.penguin.co.uk/_next/static/chunks/page...: 49 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.penguin.co.uk/_next/static/chunks/2164...: 41 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.penguin.co.uk/_next/static/chunks/2164...: 41 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.penguin.co.uk/_next/static/chunks/5223...: 40 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 237 KB
237 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn-ukwest.onetrust.com/scripttemplates/202602.1.0/otBannerSdk.js129 KB68 KB (52%)✓3rd
https://www.penguin.co.uk/_next/static/chunks/pages/_app-7349391626bb9263.js119 KB49 KB (41%)✓3rd
https://www.penguin.co.uk/_next/static/chunks/2164-7f327a12c62636eb.js0 KB41 KB (69%)✓3rd
https://www.penguin.co.uk/_next/static/chunks/2164-7f327a12c62636eb.js20 KB41 KB (69%)✓3rd
https://www.penguin.co.uk/_next/static/chunks/5223-5f7a5e00a03bf759.js68 KB40 KB (58%)✓3rd
https://www.penguin.co.uk/_next/static/chunks/1073-d6fd4d7618df984c.js33 KB—✓3rd
https://js-agent.newrelic.com/nr-spa-1216.min.js17 KB—✓3rd
https://www.penguin.co.uk/_next/static/chunks/framework-945b357d4a851f4b.js44 KB—✓3rd
https://www.everestjs.net/static/le/last-event-tag-latest.min.js0 KB—✓3rd
https://www.penguin.co.uk/_next/static/chunks/3577-eb0c1b303aa813bc.js8 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

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 (190 KB)
PASS
9 fonts (190 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

190 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.3 s LCP 6.4 shttps://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Regular.woff2Avenir-Next-LT-W01-Regu... https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Regular.woff2 — 16.3 KiB — 18 ms — font-display: swaphttps://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Medium.woff2Avenir-Next-LT-W01-Medi... https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Medium.woff2 — 19.3 KiB — 73 ms — font-display: swaphttps://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Demi-Bold.woff2Avenir-Next-LT-W01-Demi... https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Demi-Bold.woff2 — 18.2 KiB — 28 ms — font-display: swaphttps://www.penguin.co.uk/fonts/ITC-Avant-Garde-Gothic-W01-Medium.woff2ITC-Avant-Garde-Gothic-... https://www.penguin.co.uk/fonts/ITC-Avant-Garde-Gothic-W01-Medium.woff2 — 19.1 KiB — 22 ms — font-display: swaphttps://www.penguin.co.uk/fonts/ITC-Avant-Garde-Gothic-W01-Demi-Bold.woff2ITC-Avant-Garde-Gothic-... https://www.penguin.co.uk/fonts/ITC-Avant-Garde-Gothic-W01-Demi-Bold.woff2 — 18.3 KiB — 18 ms — font-display: swaphttps://www.penguin.co.uk/_next/static/media/PenguinInclusiveSans-Bold.72917e6f.woff2PenguinInclusiveSans-Bo... https://www.penguin.co.uk/_next/static/media/PenguinInclusiveSans-Bold.72917e6f.woff2 — 31.2 KiB — 19 ms — font-display: swaphttps://www.penguin.co.uk/_next/static/media/PenguinInclusiveSans-Regular.d91d0e86.woff2PenguinInclusiveSans-Re... https://www.penguin.co.uk/_next/static/media/PenguinInclusiveSans-Regular.d91d0e86.woff2 — 30.8 KiB — 23 ms — font-display: swaphttps://www.penguin.co.uk/_next/static/media/ITC-Avant-Garde-Gothic-W01-Demi-Bold.ae5fbf28.woff2ITC-Avant-Garde-Gothic-... https://www.penguin.co.uk/_next/static/media/ITC-Avant-Garde-Gothic-W01-Demi-Bold.ae5fbf28.woff2 — 18.5 KiB — 15 ms — font-display: swaphttps://www.penguin.co.uk/_next/static/media/Avenir-Next-LT-W01-Medium.b3eb3625.woff2Avenir-Next-LT-W01-Medi... https://www.penguin.co.uk/_next/static/media/Avenir-Next-LT-W01-Medium.b3eb3625.woff2 — 18.6 KiB — 10 ms — font-display: swap
Avenir-Next-LT-W01-Regu... woff2 swap
Size 16 KB
Load time 18 ms
Start 118 ms
Risk FOUT — text flashes from fallback to web font
Avenir-Next-LT-W01-Medi... woff2 swap
Size 19 KB
Load time 73 ms
Start 120 ms
Risk FOUT — text flashes from fallback to web font
Avenir-Next-LT-W01-Demi... woff2 swap
Size 18 KB
Load time 28 ms
Start 121 ms
Risk FOUT — text flashes from fallback to web font
ITC-Avant-Garde-Gothic-... woff2 swap
Size 19 KB
Load time 22 ms
Start 121 ms
Risk FOUT — text flashes from fallback to web font
ITC-Avant-Garde-Gothic-... woff2 swap
Size 18 KB
Load time 18 ms
Start 122 ms
Risk FOUT — text flashes from fallback to web font
PenguinInclusiveSans-Bo... woff2 swap
Size 31 KB
Load time 19 ms
Start 265 ms
Risk FOUT — text flashes from fallback to web font
PenguinInclusiveSans-Re... woff2 swap
Size 31 KB
Load time 23 ms
Start 265 ms
Risk FOUT — text flashes from fallback to web font
ITC-Avant-Garde-Gothic-... woff2 swap
Size 19 KB
Load time 15 ms
Start 664 ms
Risk FOUT — text flashes from fallback to web font
Avenir-Next-LT-W01-Medi... woff2 swap
Size 19 KB
Load time 10 ms
Start 1.0 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)
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
18 hints, 0 missing preconnects
PASS
18 hints, 0 missing preconnects
Info::
Page uses 18 resource hint(s)

Current Resource Hints

preconnect
1
preload
10
dns-prefetch
—
prefetch
7

18 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
99 requests over 1573ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.3 s LCP 6.4 shttps://penguin.co.uk// https://penguin.co.uk/ — 308 — 465 B — 70 ms — h2https://www.penguin.co.uk/www.penguin.co.uk/ https://www.penguin.co.uk/ — 200 — 68.2 KiB — 34 ms — h2https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Regular.woff2www.penguin.co.uk/fonts/Avenir-Next... https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Regular.woff2 — 200 — 16.3 KiB — 18 ms — h2https://www.everestjs.net/static/le/last-event-tag-latest.min.jswww.everestjs.net/static/le/last-ev... https://www.everestjs.net/static/le/last-event-tag-latest.min.js — -1 — 0 B — 149 ms — https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Medium.woff2www.penguin.co.uk/fonts/Avenir-Next... https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Medium.woff2 — 200 — 19.3 KiB — 73 ms — h2https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Demi-Bold.woff2www.penguin.co.uk/fonts/Avenir-Next... https://www.penguin.co.uk/fonts/Avenir-Next-LT-W01-Demi-Bold.woff2 — 200 — 18.2 KiB — 28 ms — h2https://www.penguin.co.uk/fonts/ITC-Avant-Garde-Gothic-W01-Medium.woff2www.penguin.co.uk/fonts/ITC-Avant-G... https://www.penguin.co.uk/fonts/ITC-Avant-Garde-Gothic-W01-Medium.woff2 — 200 — 19.1 KiB — 22 ms — h2https://www.penguin.co.uk/fonts/ITC-Avant-Garde-Gothic-W01-Demi-Bold.woff2www.penguin.co.uk/fonts/ITC-Avant-G... https://www.penguin.co.uk/fonts/ITC-Avant-Garde-Gothic-W01-Demi-Bold.woff2 — 200 — 18.3 KiB — 18 ms — h2https://www.penguin.co.uk/_next/static/css/6801c10005d8b73a.csswww.penguin.co.uk/_next/static/css/... https://www.penguin.co.uk/_next/static/css/6801c10005d8b73a.css — 200 — 25.8 KiB — 29 ms — h2https://www.penguin.co.uk/_next/static/css/b6333fcbf4b08310.csswww.penguin.co.uk/_next/static/css/... https://www.penguin.co.uk/_next/static/css/b6333fcbf4b08310.css — 200 — 13.9 KiB — 31 ms — h2https://www.penguin.co.uk/_next/static/css/815f58dbc43dca5c.csswww.penguin.co.uk/_next/static/css/... https://www.penguin.co.uk/_next/static/css/815f58dbc43dca5c.css — 200 — 4.0 KiB — 24 ms — h2https://www.penguin.co.uk/_next/static/css/a33e6bb48e4b0929.csswww.penguin.co.uk/_next/static/css/... https://www.penguin.co.uk/_next/static/css/a33e6bb48e4b0929.css — 200 — 22.9 KiB — 25 ms — h2https://www.penguin.co.uk/_next/static/css/9751753c2cdb4a17.csswww.penguin.co.uk/_next/static/css/... https://www.penguin.co.uk/_next/static/css/9751753c2cdb4a17.css — 200 — 217 B — 30 ms — h2https://cdn-ukwest.onetrust.com/consent/019adf71-9a5d-7b26-a54e-844548020da6/OtAutoBlock.jscdn-ukwest.onetrust.com/consent/019... https://cdn-ukwest.onetrust.com/consent/019adf71-9a5d-7b26-a54e-844548020da6/OtAutoBlock.js — 200 — 5.0 KiB — 134 ms — h2https://cdn-ukwest.onetrust.com/consent/019adf71-9a5d-7b26-a54e-844548020da6/otSDKStub.jscdn-ukwest.onetrust.com/consent/019... https://cdn-ukwest.onetrust.com/consent/019adf71-9a5d-7b26-a54e-844548020da6/otSDKStub.js — 200 — 9.4 KiB — 140 ms — h2https://www.penguin.co.uk/newrelicmonitoring.min.jswww.penguin.co.uk/newrelicmonitorin... https://www.penguin.co.uk/newrelicmonitoring.min.js — 200 — 11.6 KiB — 28 ms — h2https://www.penguin.co.uk/_next/static/chunks/webpack-0236525dca347823.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/webpack-0236525dca347823.js — 200 — 2.5 KiB — 28 ms — h2https://www.penguin.co.uk/_next/static/chunks/framework-945b357d4a851f4b.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/framework-945b357d4a851f4b.js — 200 — 44.5 KiB — 39 ms — h2https://www.penguin.co.uk/_next/static/chunks/main-fd62e7a6acd89978.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/main-fd62e7a6acd89978.js — 200 — 37.5 KiB — 60 ms — h2https://www.penguin.co.uk/_next/static/chunks/pages/_app-7349391626bb9263.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/pages/_app-7349391626bb9263.js — 200 — 118.8 KiB — 64 ms — h2https://www.penguin.co.uk/_next/static/chunks/1073-d6fd4d7618df984c.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/1073-d6fd4d7618df984c.js — 200 — 33.1 KiB — 37 ms — h2https://www.penguin.co.uk/_next/static/chunks/3577-eb0c1b303aa813bc.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/3577-eb0c1b303aa813bc.js — 200 — 7.6 KiB — 31 ms — h2https://www.penguin.co.uk/_next/static/chunks/8965-e0325ce5408c86d6.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/8965-e0325ce5408c86d6.js — 200 — 58.5 KiB — 64 ms — h2https://www.penguin.co.uk/_next/static/chunks/577-bea0f5280e69084a.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/577-bea0f5280e69084a.js — 200 — 49.7 KiB — 58 ms — h2https://www.penguin.co.uk/_next/static/chunks/371-90541ad606f7c415.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/371-90541ad606f7c415.js — 200 — 6.8 KiB — 42 ms — h2https://www.penguin.co.uk/_next/static/chunks/6080-c2b45be93e9cfd38.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/6080-c2b45be93e9cfd38.js — 200 — 5.3 KiB — 38 ms — h2https://www.penguin.co.uk/_next/static/chunks/4028-3cc68850a636f448.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/4028-3cc68850a636f448.js — 200 — 4.3 KiB — 51 ms — h2https://www.penguin.co.uk/_next/static/chunks/5223-5f7a5e00a03bf759.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/5223-5f7a5e00a03bf759.js — 200 — 67.8 KiB — 58 ms — h2https://www.penguin.co.uk/_next/static/chunks/pages/index-6e6ac7810b55ebd6.jswww.penguin.co.uk/_next/static/chun... 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h3https://www.penguin.co.uk/_next/image?url=https%3A%2F%2Fcdn.penguin.co.uk%2Fdam-assets%2Fbooks%2F9780241805886%2F9780241805886-jacket-medium.jpg&w=599&q=100www.penguin.co.uk/_next/image?url=h... https://www.penguin.co.uk/_next/image?url=https%3A%2F%2Fcdn.penguin.co.uk%2Fdam-assets%2Fbooks%2F9780241805886%2F9780241805886-jacket-medium.jpg&w=599&q=100 — 200 — 37.8 KiB — 203 ms — h3https://www.penguin.co.uk/_next/image?url=https%3A%2F%2Fcdn.penguin.co.uk%2Fdam-assets%2Fbooks%2F9781804956274%2F9781804956274-jacket-medium.jpg&w=379&q=100www.penguin.co.uk/_next/image?url=h... https://www.penguin.co.uk/_next/image?url=https%3A%2F%2Fcdn.penguin.co.uk%2Fdam-assets%2Fbooks%2F9781804956274%2F9781804956274-jacket-medium.jpg&w=379&q=100 — 200 — 26.4 KiB — 182 ms — h3https://www.penguin.co.uk/_next/static/chunks/3903-1bc6a22c167cea88.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/3903-1bc6a22c167cea88.js — 200 — 3.2 KiB — 11 ms — 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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 3699ms · 444KB · £38/mo
www.penguin.co.uk
Other
Costly
Execution 1030ms
Transfer 44 KB
Monthly Cost £11/mo
www.penguin.co.uk
Other
Costly
Execution 1021ms
Transfer 68 KB
Monthly Cost £11/mo
Unattributable
Other
Costly
Execution 674ms
Transfer 0 KB
Monthly Cost £7/mo
cdn-ukwest.onetrust.com
Other
Costly
Execution 344ms
Transfer 129 KB
Unused 52%
Monthly Cost £4/mo
www.penguin.co.uk
Other
Optional
Execution 170ms
Transfer 119 KB
Unused 41%
Monthly Cost £2/mo
www.penguin.co.uk
Other
Optional
Execution 151ms
Transfer 12 KB
Monthly Cost £2/mo
www.penguin.co.uk
Other
Optional
Execution 132ms
Transfer 1 KB
Monthly Cost £1/mo
www.penguin.co.uk
Other
Optional
Execution 91ms
Transfer 38 KB
Monthly Cost £1/mo
www.penguin.co.uk
Other
Optional
Execution 86ms
Transfer 33 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.penguin.co.uk adds 1030ms and costs ~£11/month
  • www.penguin.co.uk adds 1021ms and costs ~£11/month
  • Unattributable adds 674ms and costs ~£7/month
  • cdn-ukwest.onetrust.com adds 344ms and costs ~£4/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.penguin.co.uk takes 1030ms 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.penguin.co.uk takes 1021ms 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 674ms 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

cdn-ukwest.onetrust.com takes 344ms 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 cdn-ukwest.onetrust.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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