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https://warwick.ac.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
1
REVIEW
6
PASS
6
INFO
2

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

Mobile Desktop
83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.61 s

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

2.01 s

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

36 ms

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.

1.61 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.

2.01 s

Page Load Progression

403 ms
806 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
15
6 PASS 6 REVIEW 1 FIX
F
Page Weight Budget
Action
12.4 MB transferred, 73 requests
FIX
12.4 MB transferred, 73 requests
Critical::
Page weighs 13.6 MB (12.4 MB transferred)
Info::
Fonts are 817 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 817 KB
Info::
73 HTTP requests
Info::
Estimated 2.6 g CO2 per page load
12.4 MB / 2.4 MB budget
12.4 MB transferred
73 requests
2.6 g CO2 per page load
Other 10.6 MiB 85%
Fonts 816.9 KiB 6%
Images 549.7 KiB 4%
JavaScript 381.9 KiB 3%
CSS 131.5 KiB 1%
HTML 22.6 KiB 0%
Other 16.2 KiB 0%
Other 4.7 KiB 0%
Other 997 B 0%
0 2.4 MB 4.9 MB
Over budget

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

C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://warwick.ac.uk/abstract_1.webp?maxWidth=480 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/abstract_2.webp?maxWidth=480 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/instagram.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/open_days.webp?maxWidth=480 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/abstract_3.webp?maxWidth=480 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/youtube.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/static_site/uk-map.webp.5655... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/destination_warwick.webp?max... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/facebook.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/tiktok.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/visit_campus.webp?maxWidth=4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/clearing-2025.webp?maxWidth=... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/set-the-pace-alumni.webp?max... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/linkedin.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 550 KB
0 oversized -0 KB
8 legacy format
14 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

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

B
JS Execution Cost
644ms total JS execution
REVIEW
644ms total JS execution
Info::
Unattributable: 232ms CPU time
Info::
https://warwick.ac.uk/: 204ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-55N...: 149ms CPU time
Info::
https://d36jn9qou1tztq.cloudfront.net/static_war/r...: 59ms CPU time
Warning::
Third-party scripts: 440ms (68% of total)

Main Thread Breakdown

Other 39% Script Evaluation 29% Style & Layout 24% Script Parsing & Compilation 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable232ms12ms0ms3rd
https://warwick.ac.uk/204ms3ms1ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-55N43RF149ms129ms18ms3rd
https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/js/id7-bundle-render.js.84026552496659ms43ms4ms3rd
B
JS Bundles
13 scripts, 131 KB unused
REVIEW
13 scripts, 131 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-55N...: 76 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d36jn9qou1tztq.cloudfront.net/static_war/r...: 54 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://warwick.ac.uk/hp-2025.js: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 131 KB
131 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-55N43RF184 KB76 KB (41%)✓3rd
https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/js/id7-bundle-render.js.84026552496692 KB54 KB (59%)✓3rd
https://d36jn9qou1tztq.cloudfront.net/static_war/render/scripts/global-permission.js.3276904427482 KB—✓3rd
https://d36jn9qou1tztq.cloudfront.net/static_site/site.js.2952151327931 KB—✓3rd
https://warwick.ac.uk/hp-2025.js13 KB—✗1st
https://d36jn9qou1tztq.cloudfront.net/static_war/render/statuspage-widget/main.js.18889354009414 KB—✓3rd
https://warwick.ac.uk/study/course-cleaner.js13 KB—✗1st
https://warwick.ac.uk/study/undergraduate/marketing-modules.js1 KB—✓1st
https://warwick.ac.uk/study/material_information.js10 KB—✗1st
https://d36jn9qou1tztq.cloudfront.net/static_war/sitebuilder.js.14510459801217 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
Page Weight Inventory
Action
73 resources · 12.4 MB · 131 KB savings available
REVIEW
73 resources · 12.4 MB · 131 KB savings available
Warning::
Page weight 11.4 MB over 1MB target
Got: 12.4 MB Expected: ≤ 1 MB
Info::
~131 KB of savings available
Info::
40 third-party resources (10% of weight)
Info::
1 resources over 200KB
73 resources · 12.4 MiB · 40 third-party 11.4 MiB over 1MB target
Media 85% · 10.6 MiB
Font 6% · 816.9 KiB
Image 4% · 563.1 KiB
JavaScript 3% · 381.9 KiB
CSS 1% · 131.5 KiB
Document 0% · 22.6 KiB
Other 0% · 8.5 KiB

~130.7 KiB of savings available

Remove unused JavaScript: 130.7 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache, private, must-revalidate
REVIEW
no-cache, private, must-revalidate
Info::
Cache-Control header is set
Got: no-cache, private, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

no-cache, private, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
10% third-party, 0 ms blocking
PASS
10% third-party, 0 ms blocking
Info::
Third-party code accounts for 10% of page weight (1.2 MiB of 12.4 MiB)
Info::
Third-party blocking time is low (0 ms)
90%
First-party Third-party
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
10 fonts (817 KB)
PASS
10 fonts (817 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

817 KB total

Render-blocking

0

of 10

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 1.6 s LCP 2.0 shttps://use.typekit.net/af/912d1e/00000000000000007735bb33/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/912d1e/00000000000000007735bb33/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 25.9 KiB — 27 ms — font-display: swaphttps://use.typekit.net/af/c002e2/00000000000000007735bb32/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/c002e2/00000000000000007735bb32/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 28.0 KiB — 34 ms — font-display: swaphttps://use.typekit.net/af/2288cb/00000000000000007735bb39/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/2288cb/00000000000000007735bb39/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 27.2 KiB — 16 ms — font-display: swaphttps://use.typekit.net/af/216c2e/00000000000000007735bb6a/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/216c2e/00000000000000007735bb6a/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 25.4 KiB — 26 ms — font-display: swaphttps://use.typekit.net/af/c7a282/00000000000000007735bb62/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/c7a282/00000000000000007735bb62/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 24.1 KiB — 30 ms — font-display: swaphttps://use.typekit.net/af/68dda9/00000000000000007735bb35/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/68dda9/00000000000000007735bb35/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 27.3 KiB — 32 ms — font-display: swaphttps://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-light-300.woff2.149420877782fa-light-300.woff2.1494... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-light-300.woff2.149420877782 — 180.6 KiB — 14 ms — font-display: swaphttps://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-solid-900.woff2.254471731011fa-solid-900.woff2.2544... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-solid-900.woff2.254471731011 — 134.5 KiB — 16 ms — font-display: swaphttps://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-regular-400.woff2.125978268307fa-regular-400.woff2.12... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-regular-400.woff2.125978268307 — 165.5 KiB — 21 ms — font-display: swaphttps://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-duotone-900.woff2.211389069736fa-duotone-900.woff2.21... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-duotone-900.woff2.211389069736 — 178.5 KiB — 23 ms — font-display: swap
l woff2 swap
Size 26 KB
Load time 27 ms
Start 478 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 28 KB
Load time 34 ms
Start 479 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 16 ms
Start 479 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 25 KB
Load time 26 ms
Start 480 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 24 KB
Load time 30 ms
Start 480 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 32 ms
Start 481 ms
Risk FOUT — text flashes from fallback to web font
fa-light-300.woff2.1494... woff2 swap
Size 181 KB
Load time 14 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-solid-900.woff2.2544... woff2 swap
Size 135 KB
Load time 16 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-regular-400.woff2.12... woff2 swap
Size 166 KB
Load time 21 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-duotone-900.woff2.21... woff2 swap
Size 178 KB
Load time 23 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~330 KB and ~660 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
73 requests over 1626ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.6 s LCP 2.0 shttps://warwick.ac.uk// https://warwick.ac.uk/ — 200 — 22.6 KiB — 242 ms — http/1.1https://use.typekit.net/iog2qgq.cssuse.typekit.net/iog2qgq.css https://use.typekit.net/iog2qgq.css — 200 — 1.4 KiB — 38 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/css/pack7-2025-home.css.238215222746d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/css/pack7-2025-home.css.238215222746 — 200 — 102.9 KiB — 39 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/statuspage-widget/main.css.246290990343d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/statuspage-widget/main.css.246290990343 — 200 — 1.4 KiB — 23 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_site/site.css.634450487448d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_site/site.css.634450487448 — 200 — 7.4 KiB — 24 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/js/id7-bundle-render.js.840265524966d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/js/id7-bundle-render.js.840265524966 — 200 — 92.3 KiB — 41 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/sitebuilder.js.145104598012d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/sitebuilder.js.145104598012 — 200 — 17.2 KiB — 19 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_site/site.js.295215132793d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_site/site.js.295215132793 — 200 — 993 B — 32 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/scripts/global-permission.js.327690442748d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/scripts/global-permission.js.327690442748 — 200 — 1.5 KiB — 30 ms — h2https://warwick.ac.uk/hp-2025.css?x=2/hp-2025.css?x=2 https://warwick.ac.uk/hp-2025.css?x=2 — 200 — 10.1 KiB — 38 ms — http/1.1https://warwick.ac.uk/static_war/newsbuilder/news.css/static_war/newsbuilder/news.css https://warwick.ac.uk/static_war/newsbuilder/news.css — 302 — 284 B — 52 ms — http/1.1https://warwick.ac.uk/static_war/newsbuilder/categories.css/static_war/newsbuilder/categories.... https://warwick.ac.uk/static_war/newsbuilder/categories.css — 302 — 290 B — 70 ms — http/1.1https://warwick.ac.uk/hp-2025.js/hp-2025.js https://warwick.ac.uk/hp-2025.js — 200 — 12.7 KiB — 72 ms — http/1.1https://warwick.ac.uk/services/marketing/teams/cds/web/toolkit/hero-content-scheduling/wu_stem_landingpage-2.webp/services/marketing/teams/cds/web/t... https://warwick.ac.uk/services/marketing/teams/cds/web/toolkit/hero-content-scheduling/wu_stem_landingpage-2.webp — 200 — 133.5 KiB — 128 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
68% of JavaScript execution is third-party
First-party Third-party 440ms · 277KB · £5/mo
Unattributable
Other
Costly
Execution 232ms
Transfer 0 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 149ms
Transfer 184 KB
Unused 41%
Monthly Cost £2/mo
d36jn9qou1tztq.cloudfront.net
Other
Optional
Execution 59ms
Transfer 92 KB
Unused 59%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 232ms and costs ~£2/month

68% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 232ms 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

59% of d36jn9qou1tztq.cloudfront.net'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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