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https://penguin.co.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
91
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.

842 ms

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

1.78 s

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

81 ms

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

0.003

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

1.28 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.

2.17 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
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 109 requests
FIX
2.9 MB transferred, 109 requests
Warning::
Page weighs 5.5 MB (2.9 MB transferred)
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Warning::
JavaScript is 614 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 614 KB
Warning::
109 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.61 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
109 requests
0.61 g CO2 per page load
Images 1.4 MiB 48%
JavaScript 613.9 KiB 21%
Other 563.9 KiB 19%
Fonts 189.5 KiB 6%
HTML 68.2 KiB 2%
CSS 66.8 KiB 2%
Other 35.8 KiB 1%
Other 2.1 KiB 0%
Other 1.1 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

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

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 (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
109 resources · 2.9 MB · 237 KB savings available
FIX
109 resources · 2.9 MB · 237 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~237 KB of savings available
Warning::
108 third-party resources (100% of weight)
Info::
1 resources over 200KB
109 resources · 2.9 MiB · 108 third-party 1.9 MiB over 1MB target
Image 48% · 1.4 MiB
JavaScript 23% · 669.9 KiB
Other 18% · 531.2 KiB
Font 6% · 189.5 KiB
CSS 3% · 79.9 KiB
Document 2% · 68.2 KiB

~237.3 KiB of savings available

Remove unused JavaScript: 237.3 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.

B
Image Optimization
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Info::
All images are well-optimized
31 images 1.4 MB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
869ms total JS execution
REVIEW
869ms total JS execution
Warning::
https://www.penguin.co.uk/_next/static/chunks/fram...: 314ms CPU time
Warning::
https://www.penguin.co.uk/: 298ms CPU time
Info::
Unattributable: 173ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 84ms CPU time
Warning::
Third-party scripts: 869ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 23% Style & Layout 17% Rendering 5% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.penguin.co.uk/_next/static/chunks/framework-945b357d4a851f4b.js314ms293ms3ms3rd
https://www.penguin.co.uk/298ms5ms0ms3rd
Unattributable173ms23ms0ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202602.1.0/otBannerSdk.js84ms50ms12ms3rd
C
JS Bundles
Action
37 scripts, 237 KB unused
REVIEW
37 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/s5KKKmKLwXKDbORYDVcTK/_ssgManifest.js0 KB—✓3rd
https://js-agent.newrelic.com/nr-spa-1216.min.js17 KB—✓3rd
https://www.penguin.co.uk/_next/static/chunks/framework-945b357d4a851f4b.js45 KB—✓3rd
https://www.penguin.co.uk/_next/static/chunks/1073-d6fd4d7618df984c.js33 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 500 ms 1.0 s 1.5 s FCP 842 ms LCP 1.8 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 — 38 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 — 18.4 KiB — 20 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 — 35 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 — 33 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 — 18.4 KiB — 17 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 — 35 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 — 36 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 — 12 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 — 14 ms — font-display: swap
Avenir-Next-LT-W01-Regu... woff2 swap
Size 16 KB
Load time 38 ms
Start 245 ms
Risk FOUT — text flashes from fallback to web font
Avenir-Next-LT-W01-Medi... woff2 swap
Size 18 KB
Load time 20 ms
Start 246 ms
Risk FOUT — text flashes from fallback to web font
Avenir-Next-LT-W01-Demi... woff2 swap
Size 18 KB
Load time 35 ms
Start 246 ms
Risk FOUT — text flashes from fallback to web font
ITC-Avant-Garde-Gothic-... woff2 swap
Size 19 KB
Load time 33 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
ITC-Avant-Garde-Gothic-... woff2 swap
Size 18 KB
Load time 17 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
PenguinInclusiveSans-Bo... woff2 swap
Size 31 KB
Load time 35 ms
Start 383 ms
Risk FOUT — text flashes from fallback to web font
PenguinInclusiveSans-Re... woff2 swap
Size 31 KB
Load time 36 ms
Start 383 ms
Risk FOUT — text flashes from fallback to web font
ITC-Avant-Garde-Gothic-... woff2 swap
Size 19 KB
Load time 12 ms
Start 873 ms
Risk FOUT — text flashes from fallback to web font
Avenir-Next-LT-W01-Medi... woff2 swap
Size 19 KB
Load time 14 ms
Start 1.2 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
109 requests over 1754ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 842 ms LCP 1.8 shttps://penguin.co.uk// https://penguin.co.uk/ — 308 — 466 B — 214 ms — h2https://www.penguin.co.uk/www.penguin.co.uk/ https://www.penguin.co.uk/ — 200 — 68.2 KiB — 20 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 — 38 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 — 140 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 — 18.4 KiB — 20 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 — 35 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 — 33 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 — 18.4 KiB — 17 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 — 25.9 KiB — 30 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 — 41 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 — 40 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 — 40 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 — 220 B — 26 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 — 155 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 — 172 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 — 38 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 — 32 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 — 55 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 — 69 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 — 83 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 — 33.3 KiB — 62 ms — h3https://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 — 7.8 KiB — 40 ms — h3https://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 — 58.7 KiB — 74 ms — h3https://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 — 49.9 KiB — 61 ms — h3https://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 — 7.0 KiB — 49 ms — h3https://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 — 5.6 KiB — 48 ms — h3https://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 — 4.6 KiB — 59 ms — h3https://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 — 68.0 KiB — 71 ms — h3https://www.penguin.co.uk/_next/static/chunks/pages/index-6e6ac7810b55ebd6.jswww.penguin.co.uk/_next/static/chun... https://www.penguin.co.uk/_next/static/chunks/pages/index-6e6ac7810b55ebd6.js — 200 — 1.1 KiB — 65 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 869ms · 242KB · £9/mo
www.penguin.co.uk
Other
Costly
Execution 314ms
Transfer 45 KB
Monthly Cost £3/mo
www.penguin.co.uk
Other
Costly
Execution 298ms
Transfer 68 KB
Monthly Cost £3/mo
Unattributable
Other
Optional
Execution 173ms
Transfer 0 KB
Monthly Cost £2/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 84ms
Transfer 129 KB
Unused 52%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.penguin.co.uk adds 314ms and costs ~£3/month
  • www.penguin.co.uk adds 298ms and costs ~£3/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 314ms 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 298ms 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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