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https://waterstones.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
75
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
82
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.

1.41 s

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

1.97 s

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

34 ms

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

0.223

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

1.48 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.

2.50 s

Page Load Progression

585 ms
1.2 s
1.8 s
2.3 s
2.9 s
3.5 s
4.1 s
4.7 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 123 requests
FIX
2.9 MB transferred, 123 requests
Warning::
Page weighs 6.2 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 676 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 676 KB
Warning::
123 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.60 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
123 requests
0.60 g CO2 per page load
Images 1.4 MiB 47%
JavaScript 676.0 KiB 23%
Other 279.7 KiB 9%
HTML 172.7 KiB 6%
Fonts 154.4 KiB 5%
CSS 143.2 KiB 5%
Other 110.8 KiB 4%
Other 12.1 KiB 0%
Other 1.1 KiB 0%
Other 260 B 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
123 resources · 2.9 MB · 276 KB savings available
FIX
123 resources · 2.9 MB · 276 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~276 KB of savings available
Warning::
122 third-party resources (100% of weight)
Info::
2 resources over 200KB
123 resources · 2.9 MiB · 122 third-party 1.9 MiB over 1MB target
Image 47% · 1.4 MiB
JavaScript 23% · 676.0 KiB
Document 10% · 288.0 KiB
Other 10% · 286.4 KiB
Font 5% · 154.4 KiB
CSS 5% · 143.2 KiB

~276.1 KiB of savings available

Remove unused JavaScript: 276.1 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
74 images, 0 KB saveable
REVIEW
74 images, 0 KB saveable
Warning::
https://cdn.waterstones.com/images/00508273-1366x3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.waterstones.com/images/00509410-1366x3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.waterstones.com/images/00507434-1366x3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
74 images 1.4 MB
0 oversized -0 KB
15 legacy format
3 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

C
JS Execution Cost
Action
1826ms total JS execution
REVIEW
1826ms total JS execution
Warning::
https://www.waterstones.com/: 787ms CPU time
Warning::
https://static.waterstones.com/11.19.0/js/bundle.j...: 448ms CPU time
Info::
Unattributable: 207ms CPU time
Info::
https://cdn-cookieyes.com/client_data/7d1896a33bd5...: 124ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-N66...: 85ms CPU time
Warning::
Third-party scripts: 1826ms (100% of total)

Main Thread Breakdown

Script Evaluation 34% Other 27% Style & Layout 25% Rendering 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.waterstones.com/787ms70ms6ms3rd
https://static.waterstones.com/11.19.0/js/bundle.js448ms175ms17ms3rd
Unattributable207ms9ms0ms3rd
https://cdn-cookieyes.com/client_data/7d1896a33bd53d40c20b3666/script.js124ms114ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N66L6Q85ms74ms10ms3rd
https://www.waterstones.com/cdn-cgi/challenge-platform/scripts/jsd/main.js71ms61ms1ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js53ms36ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-P4C39TQPV3&cx=c&gtm=4e64k050ms40ms10ms3rd
C
JS Bundles
Action
15 scripts, 276 KB unused
REVIEW
15 scripts, 276 KB unused
Warning::
https://static.waterstones.com/11.19.0/js/bundle.j...: 153 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-P4C3...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N66...: 60 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 276 KB
276 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.waterstones.com/11.19.0/js/bundle.js212 KB153 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-P4C39TQPV3&cx=c&gtm=4e64k0153 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N66L6Q142 KB60 KB (42%)✓3rd
https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js17 KB—✓3rd
https://static.waterstones.com/11.19.0/js/ecommerce.js2 KB—✓3rd
https://cdn-cookieyes.com/client_data/7d1896a33bd53d40c20b3666/banner.js33 KB—✓3rd
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://www.waterstones.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 KB—✓3rd
https://cdn-cookieyes.com/client_data/7d1896a33bd53d40c20b3666/script.js34 KB—✓3rd
https://www.dwin1.com/3787.js16 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
8 fonts (154 KB)
PASS
8 fonts (154 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

154 KB total

Render-blocking

0

of 8

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 2.0 s FCP 1.4 s LCP 2.0 shttps://static.waterstones.com/11.19.0/fonts/sourcesanspro-light-webfont.woff2sourcesanspro-light-web... https://static.waterstones.com/11.19.0/fonts/sourcesanspro-light-webfont.woff2 — 23.2 KiB — 93 ms — font-display: swaphttps://static.waterstones.com/11.19.0/fonts/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://static.waterstones.com/11.19.0/fonts/sourcesanspro-regular-webfont.woff2 — 23.3 KiB — 99 ms — font-display: swaphttps://static.waterstones.com/11.19.0/fonts/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://static.waterstones.com/11.19.0/fonts/sourcesanspro-bold-webfont.woff2 — 23.3 KiB — 88 ms — font-display: swaphttps://static.waterstones.com/11.19.0/fonts/sourcesanspro-semibold-webfont.woff2sourcesanspro-semibold-... https://static.waterstones.com/11.19.0/fonts/sourcesanspro-semibold-webfont.woff2 — 23.3 KiB — 58 ms — font-display: swaphttps://static.waterstones.com/11.19.0/fonts/sourcesanspro-italic-webfont.woff2sourcesanspro-italic-we... https://static.waterstones.com/11.19.0/fonts/sourcesanspro-italic-webfont.woff2 — 24.6 KiB — 32 ms — font-display: swaphttps://static.waterstones.com/11.19.0/fonts/icomoon.woff?-o5tg73icomoon.woff https://static.waterstones.com/11.19.0/fonts/icomoon.woff?-o5tg73 — 10.5 KiB — 35 ms — font-display: swaphttps://static.waterstones.com/11.19.0/fonts/slick.woffslick.woff https://static.waterstones.com/11.19.0/fonts/slick.woff — 1.4 KiB — 31 ms — font-display: swaphttps://static.waterstones.com/11.19.0/fonts/sourcesanspro-lightitalic-webfont.woff2sourcesanspro-lightital... https://static.waterstones.com/11.19.0/fonts/sourcesanspro-lightitalic-webfont.woff2 — 24.7 KiB — 30 ms — font-display: swap
sourcesanspro-light-web... woff2 swap
Size 23 KB
Load time 93 ms
Start 643 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-regular-w... woff2 swap
Size 23 KB
Load time 99 ms
Start 644 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 23 KB
Load time 88 ms
Start 644 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-semibold-... woff2 swap
Size 23 KB
Load time 58 ms
Start 708 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-italic-we... woff2 swap
Size 25 KB
Load time 32 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
icomoon.woff woff swap
Size 11 KB
Load time 35 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
slick.woff woff swap
Size 1 KB
Load time 31 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
sourcesanspro-lightital... woff2 swap
Size 25 KB
Load time 30 ms
Start 2.2 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)

Fixing the unchecked items could save ~4 KB and ~8 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
Network Waterfall
123 requests over 3666ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.4 s LCP 2.0 shttps://waterstones.com// https://waterstones.com/ — 301 — 81 B — 77 ms — h2https://www.waterstones.com/www.waterstones.com/ https://www.waterstones.com/ — 200 — 77.9 KiB — 259 ms — h3https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 116 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-N66L6Qwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-N66L6Q — 200 — 142.2 KiB — 166 ms — h2https://cdn-cookieyes.com/client_data/7d1896a33bd53d40c20b3666/script.jscdn-cookieyes.com/client_data/7d189... https://cdn-cookieyes.com/client_data/7d1896a33bd53d40c20b3666/script.js — 200 — 34.3 KiB — 67 ms — h2https://static.waterstones.com/11.19.0/css/bundle.cssstatic.waterstones.com/11.19.0/css/... https://static.waterstones.com/11.19.0/css/bundle.css — 200 — 142.3 KiB — 123 ms — h2https://static.waterstones.com/11.19.0/js/bundle.jsstatic.waterstones.com/11.19.0/js/b... https://static.waterstones.com/11.19.0/js/bundle.js — 200 — 212.2 KiB — 126 ms — h2https://static.waterstones.com/11.19.0/js/ecommerce.jsstatic.waterstones.com/11.19.0/js/e... https://static.waterstones.com/11.19.0/js/ecommerce.js — 200 — 2.3 KiB — 122 ms — h2https://static.waterstones.com/11.19.0//img/plus/cards.pngstatic.waterstones.com/11.19.0//img... https://static.waterstones.com/11.19.0//img/plus/cards.png — 200 — 60.0 KiB — 124 ms — h2https://www.waterstones.com/images/cover404.pngwww.waterstones.com/images/cover404... https://www.waterstones.com/images/cover404.png — 200 — 4.1 KiB — 44 ms — h3https://cdn.waterstones.com/images/00509410-1366x379.jpegcdn.waterstones.com/images/00509410... https://cdn.waterstones.com/images/00509410-1366x379.jpeg — 200 — 46.9 KiB — 79 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 68 ms — h3https://cdn.waterstones.com/images/00509411-1000x667.jpegcdn.waterstones.com/images/00509411... https://cdn.waterstones.com/images/00509411-1000x667.jpeg — 200 — 60.1 KiB — 38 ms — h2https://cdn.waterstones.com/images/00507434-1366x379.jpegcdn.waterstones.com/images/00507434... https://cdn.waterstones.com/images/00507434-1366x379.jpeg — 200 — 70.4 KiB — 59 ms — h2https://challenges.cloudflare.com/turnstile/v0/api.jschallenges.cloudflare.com/turnstile... https://challenges.cloudflare.com/turnstile/v0/api.js — 302 — 265 B — 146 ms — h3https://cdn.waterstones.com/images/00507435-1000x667.jpegcdn.waterstones.com/images/00507435... https://cdn.waterstones.com/images/00507435-1000x667.jpeg — 200 — 80.5 KiB — 44 ms — h2https://cdn.waterstones.com/images/00508273-1366x379.jpegcdn.waterstones.com/images/00508273... https://cdn.waterstones.com/images/00508273-1366x379.jpeg — 200 — 94.7 KiB — 69 ms — h2https://cdn.waterstones.com/images/00508272-1000x667.jpegcdn.waterstones.com/images/00508272... https://cdn.waterstones.com/images/00508272-1000x667.jpeg — 200 — 105.7 KiB — 81 ms — h2https://cdn.waterstones.com/images/00319741-200x200.pngcdn.waterstones.com/images/00319741... https://cdn.waterstones.com/images/00319741-200x200.png — 200 — 3.1 KiB — 54 ms — h2https://cdn.waterstones.com/images/00444514-200x200.pngcdn.waterstones.com/images/00444514... https://cdn.waterstones.com/images/00444514-200x200.png — 200 — 5.1 KiB — 46 ms — h2https://cdn.waterstones.com/images/00444513-200x200.pngcdn.waterstones.com/images/00444513... https://cdn.waterstones.com/images/00444513-200x200.png — 200 — 3.8 KiB — 54 ms — h2https://cdn.waterstones.com/images/00444512-200x200.pngcdn.waterstones.com/images/00444512... https://cdn.waterstones.com/images/00444512-200x200.png — 200 — 3.8 KiB — 54 ms — h2https://cdn.waterstones.com/images/00300851-200x200.pngcdn.waterstones.com/images/00300851... https://cdn.waterstones.com/images/00300851-200x200.png — 200 — 4.1 KiB — 64 ms — h2https://cdn.waterstones.com/images/00300847-200x200.pngcdn.waterstones.com/images/00300847... https://cdn.waterstones.com/images/00300847-200x200.png — 200 — 4.0 KiB — 63 ms — h2https://cdn.waterstones.com/images/00300850-200x200.pngcdn.waterstones.com/images/00300850... https://cdn.waterstones.com/images/00300850-200x200.png — 200 — 3.6 KiB — 54 ms — h2https://cdn.waterstones.com/images/00300849-200x200.pngcdn.waterstones.com/images/00300849... https://cdn.waterstones.com/images/00300849-200x200.png — 200 — 4.8 KiB — 63 ms — h2https://cdn.waterstones.com/images/00300848-200x200.pngcdn.waterstones.com/images/00300848... https://cdn.waterstones.com/images/00300848-200x200.png — 200 — 3.7 KiB — 67 ms — h2https://cdn.waterstones.com/images/00510045-100x77.jpegcdn.waterstones.com/images/00510045... https://cdn.waterstones.com/images/00510045-100x77.jpeg — 200 — 2.9 KiB — 67 ms — h2https://cdn.waterstones.com/images/00508581-100x77.jpegcdn.waterstones.com/images/00508581... https://cdn.waterstones.com/images/00508581-100x77.jpeg — 200 — 2.9 KiB — 68 ms — h2https://cdn.waterstones.com/images/00508528-100x77.jpegcdn.waterstones.com/images/00508528... https://cdn.waterstones.com/images/00508528-100x77.jpeg — 200 — 4.5 KiB — 66 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 1.4 s LCP 2.0 shttps://waterstones.com// https://waterstones.com/ — 301 — 81 B — 77 ms — h2https://www.waterstones.com/www.waterstones.com/ https://www.waterstones.com/ — 200 — 77.9 KiB — 259 ms — h3https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 116 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-N66L6Qwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-N66L6Q — 200 — 142.2 KiB — 166 ms — h2https://cdn-cookieyes.com/client_data/7d1896a33bd53d40c20b3666/script.jscdn-cookieyes.com/client_data/7d189... https://cdn-cookieyes.com/client_data/7d1896a33bd53d40c20b3666/script.js — 200 — 34.3 KiB — 67 ms — h2https://static.waterstones.com/11.19.0/css/bundle.cssstatic.waterstones.com/11.19.0/css/... https://static.waterstones.com/11.19.0/css/bundle.css — 200 — 142.3 KiB — 123 ms — h2https://static.waterstones.com/11.19.0/js/bundle.jsstatic.waterstones.com/11.19.0/js/b... https://static.waterstones.com/11.19.0/js/bundle.js — 200 — 212.2 KiB — 126 ms — h2https://static.waterstones.com/11.19.0/js/ecommerce.jsstatic.waterstones.com/11.19.0/js/e... https://static.waterstones.com/11.19.0/js/ecommerce.js — 200 — 2.3 KiB — 122 ms — h2https://static.waterstones.com/11.19.0//img/plus/cards.pngstatic.waterstones.com/11.19.0//img... https://static.waterstones.com/11.19.0//img/plus/cards.png — 200 — 60.0 KiB — 124 ms — h2https://www.waterstones.com/images/cover404.pngwww.waterstones.com/images/cover404... https://www.waterstones.com/images/cover404.png — 200 — 4.1 KiB — 44 ms — h3https://cdn.waterstones.com/images/00509410-1366x379.jpegcdn.waterstones.com/images/00509410... https://cdn.waterstones.com/images/00509410-1366x379.jpeg — 200 — 46.9 KiB — 79 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 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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 1826ms · 650KB · £19/mo
www.waterstones.com
Other
Costly
Execution 787ms
Transfer 78 KB
Monthly Cost £8/mo
static.waterstones.com
Other
Costly
Execution 448ms
Transfer 212 KB
Unused 72%
Monthly Cost £5/mo
Unattributable
Other
Costly
Execution 207ms
Transfer 0 KB
Monthly Cost £2/mo
cdn-cookieyes.com
Other
Optional
Execution 124ms
Transfer 34 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 142 KB
Unused 42%
Monthly Cost £1/mo
www.waterstones.com
Other
Optional
Execution 71ms
Transfer 0 KB
Monthly Cost £1/mo
js-agent.newrelic.com
Other
Optional
Execution 53ms
Transfer 30 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 50ms
Transfer 153 KB
Unused 41%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.waterstones.com adds 787ms and costs ~£8/month
  • static.waterstones.com adds 448ms and costs ~£5/month
  • Unattributable adds 207ms 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.waterstones.com takes 787ms 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

static.waterstones.com takes 448ms 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

72% of static.waterstones.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

Unattributable takes 207ms 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

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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