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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
53
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.
81
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.

1.38 s

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

4.53 s

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

134 ms

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

0.281

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

2.13 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.

4.53 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
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
5.7 MB transferred, 79 requests
FIX
5.7 MB transferred, 79 requests
Critical::
Page weighs 9.5 MB (5.7 MB transferred)
Warning::
Images are 4.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.5 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
79 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.7 MB / 2.4 MB budget
5.7 MB transferred
79 requests
1.2 g CO2 per page load
Images 4.5 MiB 78%
JavaScript 1.1 MiB 19%
Other 54.9 KiB 1%
HTML 46.9 KiB 1%
Other 44.4 KiB 1%
Fonts 30.5 KiB 1%
Other 15.6 KiB 0%
Other 735 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

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 (5.7 MiB of 5.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
13 scripts, 531 KB unused
FIX
13 scripts, 531 KB unused
Warning::
https://www.warnerbros.com/templates/__react_stati...: 119 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.warnerbros.com/templates/__react_stati...: 92 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.warnerbros.com/templates/vendors~__rea...: 86 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.warnerbros.com/templates/vendors~main....: 71 KB unused (24%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NVM...: 70 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 531 KB
531 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.warnerbros.com/templates/__react_static_root__/src/layout/title/TitleLayout.tsx.14e38684.js139 KB119 KB (86%)✓3rd
https://www.warnerbros.com/templates/__react_static_root__/src/layout/title-landing/TitleLandingLayout.tsx.17e9cb7c.js94 KB92 KB (98%)✓3rd
https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~11170e23.adb9d838.js166 KB86 KB (55%)✓3rd
https://www.warnerbros.com/templates/vendors~main.9d050e9f.js291 KB71 KB (24%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NVM2N7H130 KB70 KB (54%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js119 KB62 KB (52%)✓3rd
https://www.warnerbros.com/templates/__react_static_root__/src/layout/home/HomeTwoLayout.tsx.9e7a3ad7.js84 KB31 KB (37%)✓3rd
https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/home/HomeTwoLayout.tsx.a7c27a94.js15 KB—✓3rd
https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/brand/BrandLayout.tsx~__react_static_root__/src/layout/bran~97505022.0a0be361.js4 KB—✓3rd
https://www.warnerbros.com/main.4e873d21.js27 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

F
Page Weight Inventory
Action
79 resources · 5.7 MB · 531 KB savings available
FIX
79 resources · 5.7 MB · 531 KB savings available
Warning::
Page weight 4.7 MB over 1MB target
Got: 5.7 MB Expected: ≤ 1 MB
Info::
~531 KB of savings available
Warning::
78 third-party resources (100% of weight)
Info::
4 resources over 200KB
79 resources · 5.7 MiB · 78 third-party 4.7 MiB over 1MB target
Image 78% · 4.5 MiB
JavaScript 19% · 1.1 MiB
Other 2% · 94.6 KiB
Document 1% · 47.5 KiB
Font 1% · 30.5 KiB
CSS 0% · 4.5 KiB

~531.0 KiB of savings available

Remove unused JavaScript: 531.0 KiB
B
Image Optimization
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Warning::
https://www.warnerbros.com/assets/images/home/wb/l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33 images 4.5 MB
0 oversized -0 KB
32 legacy format
1 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

B
JS Execution Cost
923ms total JS execution
REVIEW
923ms total JS execution
Warning::
https://www.warnerbros.com/main.4e873d21.js: 373ms CPU time
Info::
https://www.warnerbros.com/templates/vendors~main....: 147ms CPU time
Info::
Unattributable: 143ms CPU time
Info::
https://www.warnerbros.com/: 118ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202505.2...: 78ms CPU time
Warning::
Third-party scripts: 923ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 18% Script Parsing & Compilation 11% Style & Layout 11%
ScriptTotalScriptingParse/CompileParty
https://www.warnerbros.com/main.4e873d21.js373ms322ms2ms3rd
https://www.warnerbros.com/templates/vendors~main.9d050e9f.js147ms50ms30ms3rd
Unattributable143ms23ms0ms3rd
https://www.warnerbros.com/118ms3ms6ms3rd
https://cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js78ms55ms12ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NVM2N7H64ms47ms15ms3rd
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
1 fonts (31 KB)
PASS
1 fonts (31 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

31 KB total

Render-blocking

0

of 1

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 FCP 1.4 s LCP 4.5 shttps://www.warnerbros.com/static/MontserratFont.d5de368a.woff2MontserratFont.d5de368a... https://www.warnerbros.com/static/MontserratFont.d5de368a.woff2 — 30.5 KiB — 55 ms — font-display: swap
MontserratFont.d5de368a... woff2 swap
Size 31 KB
Load time 55 ms
Start 662 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)
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
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=600

DirectiveValueMeaning
max-age600Cache for 10 minutes
Effective TTL: 600 seconds
Network Waterfall
79 requests over 1903ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 4.5 shttps://warnerbros.com// https://warnerbros.com/ — 301 — 150 B — 525 ms — h2http://www.warnerbros.com/www.warnerbros.com/ http://www.warnerbros.com/ — 307 — 0 B — 2 ms — http/1.1https://www.warnerbros.com/www.warnerbros.com/ https://www.warnerbros.com/ — 200 — 46.9 KiB — 75 ms — h2https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~80d76e5e.c688ba8d.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~80d76e5e.c688ba8d.js — 200 — 29.6 KiB — 27 ms — h2https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~11170e23.adb9d838.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~11170e23.adb9d838.js — 200 — 166.3 KiB — 54 ms — h2https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~dfbe08eb.e74f5e94.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~dfbe08eb.e74f5e94.js — 200 — 2.0 KiB — 63 ms — h2https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/home/HomeTwoLayout.tsx.a7c27a94.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/home/HomeTwoLayout.tsx.a7c27a94.js — 200 — 14.7 KiB — 56 ms — h2https://www.warnerbros.com/templates/__react_static_root__/src/layout/home/HomeTwoLayout.tsx.9e7a3ad7.jswww.warnerbros.com/templates/__reac... https://www.warnerbros.com/templates/__react_static_root__/src/layout/home/HomeTwoLayout.tsx.9e7a3ad7.js — 200 — 84.0 KiB — 65 ms — h2https://www.warnerbros.com/templates/vendors~main.9d050e9f.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~main.9d050e9f.js — 200 — 291.1 KiB — 77 ms — h2https://www.warnerbros.com/main.4e873d21.jswww.warnerbros.com/main.4e873d21.js https://www.warnerbros.com/main.4e873d21.js — 200 — 26.6 KiB — 86 ms — h2https://www.warnerbros.com/assets/images/home/wb/logo.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/wb/logo.png — 200 — 37.8 KiB — 85 ms — h2https://www.warnerbros.com/assets/images/home/comedy/logo.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/comedy/logo.png — 200 — 102.6 KiB — 84 ms — h2https://www.warnerbros.com/assets/images/home/horror/logo.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/horror/logo.png — 200 — 156.0 KiB — 88 ms — h2https://www.warnerbros.com/assets/images/home/epics/logo.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/epics/logo.png — 200 — 252.4 KiB — 90 ms — h2https://www.warnerbros.com/assets/images/home/comedy/clogo.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/comedy/clogo.png — 200 — 243.4 KiB — 91 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NVM2N7Hwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NVM2N7H — 200 — 130.0 KiB — 141 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAKQ2lDQ1BJQ0MgcHJvZmlsZQAAeNqdU…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAKQ2lDQ1BJQ0MgcHJvZmlsZQAAeNqdU… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAKQ2lDQ1BJQ0MgcHJvZmlsZQAAeNqdU…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAKQ2lDQ1BJQ0MgcHJvZmlsZQAAeNqdU… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAKQ2lDQ1BJQ0MgcHJvZmlsZQAAeNqdU…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAKQ2lDQ1BJQ0MgcHJvZmlsZQAAeNqdU… — 200 — 0 B — 0 ms — datahttps://www.warnerbros.com/assets/images/home/wb/bg_desktop.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/wb/bg_desktop.png — 200 — 3.2 MiB — 154 ms — h2https://www.warnerbros.com/static/MontserratFont.d5de368a.woff2www.warnerbros.com/static/Montserra... https://www.warnerbros.com/static/MontserratFont.d5de368a.woff2 — 200 — 30.5 KiB — 55 ms — h2https://www.warnerbros.com/assets/manifest.jsonwww.warnerbros.com/assets/manifest.... https://www.warnerbros.com/assets/manifest.json — 200 — 735 B — 57 ms — h2https://d2nmfu57zhrblt.cloudfront.net/d2nmfu57zhrblt.cloudfront.net/ https://d2nmfu57zhrblt.cloudfront.net/ — 200 — 506 B — 81 ms — h2https://www.warnerbros.com/movies/blue-beetle/routeInfo.jsonwww.warnerbros.com/movies/blue-beet... https://www.warnerbros.com/movies/blue-beetle/routeInfo.json — 200 — 3.9 KiB — 22 ms — h2https://www.warnerbros.com/movies/aquaman-and-lost-kingdom/routeInfo.jsonwww.warnerbros.com/movies/aquaman-a... https://www.warnerbros.com/movies/aquaman-and-lost-kingdom/routeInfo.json — 200 — 4.5 KiB — 25 ms — h2https://www.warnerbros.com/movies/f1/routeInfo.jsonwww.warnerbros.com/movies/f1/routeI... https://www.warnerbros.com/movies/f1/routeInfo.json — 200 — 3.4 KiB — 25 ms — h2https://www.warnerbros.com/movies/mortal-kombat-ii/routeInfo.jsonwww.warnerbros.com/movies/mortal-ko... https://www.warnerbros.com/movies/mortal-kombat-ii/routeInfo.json — 200 — 2.9 KiB — 25 ms — h2https://www.warnerbros.com/movies/lee-cronins-mummy/routeInfo.jsonwww.warnerbros.com/movies/lee-croni... https://www.warnerbros.com/movies/lee-cronins-mummy/routeInfo.json — 200 — 2.5 KiB — 25 ms — h2https://irs.www.warnerbros.com/keyart-jpeg/movies/media/browser/obaa_keyart_0.jpgirs.www.warnerbros.com/keyart-jpeg/... https://irs.www.warnerbros.com/keyart-jpeg/movies/media/browser/obaa_keyart_0.jpg — 200 — 24.1 KiB — 123 ms — h2https://irs.www.warnerbros.com/keyart-jpeg/movies/media/browser/wuthering_heights_keyart.jpgirs.www.warnerbros.com/keyart-jpeg/... https://irs.www.warnerbros.com/keyart-jpeg/movies/media/browser/wuthering_heights_keyart.jpg — 200 — 15.9 KiB — 129 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 4.5 shttps://warnerbros.com// https://warnerbros.com/ — 301 — 150 B — 525 ms — h2http://www.warnerbros.com/www.warnerbros.com/ http://www.warnerbros.com/ — 307 — 0 B — 2 ms — http/1.1https://www.warnerbros.com/www.warnerbros.com/ https://www.warnerbros.com/ — 200 — 46.9 KiB — 75 ms — h2https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~80d76e5e.c688ba8d.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~80d76e5e.c688ba8d.js — 200 — 29.6 KiB — 27 ms — h2https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~11170e23.adb9d838.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~11170e23.adb9d838.js — 200 — 166.3 KiB — 54 ms — h2https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~dfbe08eb.e74f5e94.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/404/404.tsx~__react_static_root__/src/layout/articles/Artic~dfbe08eb.e74f5e94.js — 200 — 2.0 KiB — 63 ms — h2https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/home/HomeTwoLayout.tsx.a7c27a94.jswww.warnerbros.com/templates/vendor... https://www.warnerbros.com/templates/vendors~__react_static_root__/src/layout/home/HomeTwoLayout.tsx.a7c27a94.js — 200 — 14.7 KiB — 56 ms — 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h2https://www.warnerbros.com/assets/images/home/horror/logo.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/horror/logo.png — 200 — 156.0 KiB — 88 ms — h2https://www.warnerbros.com/assets/images/home/epics/logo.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/epics/logo.png — 200 — 252.4 KiB — 90 ms — h2https://www.warnerbros.com/assets/images/home/comedy/clogo.pngwww.warnerbros.com/assets/images/ho... https://www.warnerbros.com/assets/images/home/comedy/clogo.png — 200 — 243.4 KiB — 91 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NVM2N7Hwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NVM2N7H — 200 — 130.0 KiB — 141 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAKQ2lDQ1BJQ0MgcHJvZmlsZQAAeNqdU…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAKQ2lDQ1BJQ0MgcHJvZmlsZQAAeNqdU… — 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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 923ms · 614KB · $16/mo
www.warnerbros.com
Other
Costly
Execution 373ms
Transfer 27 KB
Monthly Cost $6/mo
www.warnerbros.com
Other
Optional
Execution 147ms
Transfer 291 KB
Unused 24%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 143ms
Transfer 0 KB
Monthly Cost $2/mo
www.warnerbros.com
Other
Optional
Execution 118ms
Transfer 47 KB
Monthly Cost $2/mo
OneTrust
Consent
Essential
Execution 78ms
Transfer 119 KB
Unused 52%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 130 KB
Unused 54%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.warnerbros.com adds 373ms and costs ~$6/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.warnerbros.com takes 373ms 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 OneTrust'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

54% of Google Tag Manager'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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