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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
92
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.
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.

796 ms

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

1.56 s

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

83 ms

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

0.051

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

1.17 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

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 4 REVIEW 3 FIX
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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
52 resources · 1.9 MB · 267 KB savings available
FIX
52 resources · 1.9 MB · 267 KB savings available
Warning::
Page weight 946 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~267 KB of savings available
Warning::
51 third-party resources (100% of weight)
52 resources · 1.9 MiB · 51 third-party 945.5 KiB over 1MB target
Image 53% · 1.0 MiB
JavaScript 35% · 682.6 KiB
Font 7% · 146.0 KiB
Document 3% · 51.5 KiB
CSS 2% · 42.0 KiB
Other 0% · 3.2 KiB

~266.7 KiB of savings available

Remove unused JavaScript: 266.7 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
Page Weight Budget
Action
1.9 MB transferred, 52 requests
REVIEW
1.9 MB transferred, 52 requests
Info::
Page weighs 4.1 MB (1.9 MB transferred)
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Warning::
JavaScript is 683 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 683 KB
Info::
52 HTTP requests
Info::
Estimated 0.40 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
52 requests
0.40 g CO2 per page load
Images 1.0 MiB 53%
JavaScript 682.6 KiB 35%
Fonts 146.0 KiB 7%
HTML 51.5 KiB 3%
CSS 42.0 KiB 2%
Other 2.0 KiB 0%
Other 1.9 KiB 0%
Other 553 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Info::
All images are well-optimized
22 images 1.0 MB
0 oversized -0 KB
21 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1079ms total JS execution
REVIEW
1079ms total JS execution
Info::
https://www.chathamhouse.org/: 228ms CPU time
Info::
https://www.chathamhouse.org/sites/default/files/j...: 207ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WJH...: 171ms CPU time
Info::
https://consent.cookiebot.com/796ddad9-17f7-4a51-b...: 139ms CPU time
Info::
Unattributable: 137ms CPU time
Warning::
Third-party scripts: 1079ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Style & Layout 16% Other 14% Parse HTML & CSS 8% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.chathamhouse.org/228ms37ms1ms3rd
https://www.chathamhouse.org/sites/default/files/js/js_j_Cgtn-K5gOYhKprdAd7R7N40VDhwhJWYR08vuN80lQ.js?scope=footer&delta=3&language=en&theme=numiko&include=eJyVjjEOwyAQBD-Ew5PQAhdzMnDogCT-fShSOoXbkUYzEQMZJ6n1lPBi0W6oTe-UEEndU1HoLXrYS_oIUgpqvCcl7kP03ND4lvcDdX3uGCzV0aetuqmz8CF2z-KRtx6U2-imEzQktyoOc8habZkG2T_8C9eeauI207ms98ms13ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WJHKX9N171ms142ms20ms3rd
https://consent.cookiebot.com/796ddad9-17f7-4a51-b083-b45cd0d63f0b/cc.js?renew=false&referer=www.chathamhouse.org&dnt=false&init=false139ms59ms12ms3rd
Unattributable137ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KXVPBXNKBQ&cx=c&gtm=4e64k0102ms84ms17ms3rd
https://www.chathamhouse.org/cdn-cgi/challenge-platform/scripts/jsd/main.js95ms87ms6ms3rd
C
JS Bundles
Action
13 scripts, 267 KB unused
REVIEW
13 scripts, 267 KB unused
Warning::
https://www.chathamhouse.org/sites/default/files/j...: 77 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KXVP...: 67 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WJH...: 55 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 36 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.chathamhouse.org/sites/default/files/j...: 32 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 267 KB
267 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.chathamhouse.org/sites/default/files/js/js_j_Cgtn-K5gOYhKprdAd7R7N40VDhwhJWYR08vuN80lQ.js?scope=footer&delta=3&language=en&theme=numiko&include=eJyVjjEOwyAQBD-Ew5PQAhdzMnDogCT-fShSOoXbkUYzEQMZJ6n1lPBi0W6oTe-UEEndU1HoLXrYS_oIUgpqvCcl7kP03ND4lvcDdX3uGCzV0aetuqmz8CF2z-KRtx6U2-imEzQktyoOc8habZkG2T_8C9eeauI110 KB77 KB (70%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-KXVPBXNKBQ&cx=c&gtm=4e64k0164 KB67 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WJHKX9N155 KB55 KB (36%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB36 KB (65%)✓3rd
https://www.chathamhouse.org/sites/default/files/js/js_-aXP4IA56tu3ib3n-PM1OtQL2kbdigDMdlbapGXuK_E.js?scope=footer&delta=0&language=en&theme=numiko&include=eJyVjjEOwyAQBD-Ew5PQAhdzMnDogCT-fShSOoXbkUYzEQMZJ6n1lPBi0W6oTe-UEEndU1HoLXrYS_oIUgpqvCcl7kP03ND4lvcDdX3uGCzV0aetuqmz8CF2z-KRtx6U2-imEzQktyoOc8habZkG2T_8C9eeauI54 KB32 KB (59%)✓3rd
https://cdn.jsdelivr.net/npm/jquery.scrollto@2.1.2/jquery.scrollTo.min.js2 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://unpkg.com/imagesloaded@4.1.4/imagesloaded.pkgd.min.js2 KB—✓3rd
https://consent.cookiebot.com/uc.js?cbid=796ddad9-17f7-4a51-b083-b45cd0d63f0b&implementation=gtm&consentmode-dataredaction=dynamic27 KB—✓3rd
https://static.hotjar.com/c/hotjar-512700.js?sv=77 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

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
5 fonts (146 KB)
PASS
5 fonts (146 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

146 KB total

Render-blocking

0

of 5

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 796 ms LCP 1.6 shttps://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Bold.woff2CalibreWeb-Bold.woff2 https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Bold.woff2 — 32.0 KiB — 40 ms — font-display: swaphttps://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Regular.woff2CalibreWeb-Regular.woff2 https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Regular.woff2 — 31.1 KiB — 40 ms — font-display: swaphttps://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Semibold.woff2CalibreWeb-Semibold.woff2 https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Semibold.woff2 — 31.3 KiB — 36 ms — font-display: swaphttps://www.chathamhouse.org/themes/custom/numiko/dist/font/CharterITCWeb-Regular.woff2CharterITCWeb-Regular.w... https://www.chathamhouse.org/themes/custom/numiko/dist/font/CharterITCWeb-Regular.woff2 — 21.3 KiB — 35 ms — font-display: swaphttps://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Medium.woff2CalibreWeb-Medium.woff2 https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Medium.woff2 — 30.4 KiB — 63 ms — font-display: swap
CalibreWeb-Bold.woff2 woff2 swap
Size 32 KB
Load time 40 ms
Start 65 ms
Risk FOUT — text flashes from fallback to web font
CalibreWeb-Regular.woff2 woff2 swap
Size 31 KB
Load time 40 ms
Start 65 ms
Risk FOUT — text flashes from fallback to web font
CalibreWeb-Semibold.woff2 woff2 swap
Size 31 KB
Load time 36 ms
Start 65 ms
Risk FOUT — text flashes from fallback to web font
CharterITCWeb-Regular.w... woff2 swap
Size 21 KB
Load time 35 ms
Start 66 ms
Risk FOUT — text flashes from fallback to web font
CalibreWeb-Medium.woff2 woff2 swap
Size 30 KB
Load time 63 ms
Start 255 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
52 requests over 2970ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 796 ms LCP 1.6 shttps://chathamhouse.org// https://chathamhouse.org/ — 301 — 213 B — 17 ms — h3https://www.chathamhouse.org/www.chathamhouse.org/ https://www.chathamhouse.org/ — 200 — 50.7 KiB — 33 ms — h3https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Bold.woff2www.chathamhouse.org/themes/custom/... https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Bold.woff2 — 200 — 32.0 KiB — 40 ms — h3https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Regular.woff2www.chathamhouse.org/themes/custom/... https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Regular.woff2 — 200 — 31.1 KiB — 40 ms — h3https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Semibold.woff2www.chathamhouse.org/themes/custom/... https://www.chathamhouse.org/themes/custom/numiko/dist/font/CalibreWeb-Semibold.woff2 — 200 — 31.3 KiB — 36 ms — h3https://www.chathamhouse.org/themes/custom/numiko/dist/font/CharterITCWeb-Regular.woff2www.chathamhouse.org/themes/custom/... https://www.chathamhouse.org/themes/custom/numiko/dist/font/CharterITCWeb-Regular.woff2 — 200 — 21.3 KiB — 35 ms — h3https://www.chathamhouse.org/sites/default/files/css/css_gxjbDnpEZNXP0yi22IntheWh6VWewHefpXiPZu7vSs4.css?delta=0&language=en&theme=numiko&include=eJx1yEEOAiEMheELoRyp6QwFm4G2KaDD7XVhXBjdvPzvI5sbOGEih-zY6KF-RPql1zcI3rngYBWg01BSKCyAqb0280k9fv0gs_GhsVTdsF76WJWlhE7o-w3QGHAO3bVZpUHxj4exTItzXvFTT2s3TF4www.chathamhouse.org/sites/default/... https://www.chathamhouse.org/sites/default/files/css/css_gxjbDnpEZNXP0yi22IntheWh6VWewHefpXiPZu7vSs4.css?delta=0&language=en&theme=numiko&include=eJx1yEEOAiEMheELoRyp6QwFm4G2KaDD7XVhXBjdvPzvI5sbOGEih-zY6KF-RPql1zcI3rngYBWg01BSKCyAqb0280k9fv0gs_GhsVTdsF76WJWlhE7o-w3QGHAO3bVZpUHxj4exTItzXvFTT2s3TF4 — 200 — 4.0 KiB — 11 ms — h3https://www.chathamhouse.org/sites/default/files/css/css_0lNzCehaWu41GwMHd_vn3ubH1mgfHSUTfGIYRzQir7E.css?delta=1&language=en&theme=numiko&include=eJx1yEEOAiEMheELoRyp6QwFm4G2KaDD7XVhXBjdvPzvI5sbOGEih-zY6KF-RPql1zcI3rngYBWg01BSKCyAqb0280k9fv0gs_GhsVTdsF76WJWlhE7o-w3QGHAO3bVZpUHxj4exTItzXvFTT2s3TF4www.chathamhouse.org/sites/default/... https://www.chathamhouse.org/sites/default/files/css/css_0lNzCehaWu41GwMHd_vn3ubH1mgfHSUTfGIYRzQir7E.css?delta=1&language=en&theme=numiko&include=eJx1yEEOAiEMheELoRyp6QwFm4G2KaDD7XVhXBjdvPzvI5sbOGEih-zY6KF-RPql1zcI3rngYBWg01BSKCyAqb0280k9fv0gs_GhsVTdsF76WJWlhE7o-w3QGHAO3bVZpUHxj4exTItzXvFTT2s3TF4 — 200 — 38.0 KiB — 35 ms — h3https://www.chathamhouse.org/sites/default/files/styles/12_6_media_huge/public/2026-04/2026-04-21-taiwan-crisis-hormuz-2188726519.jpg?h=01fa2516&itok=wGc89UJqwww.chathamhouse.org/sites/default/... https://www.chathamhouse.org/sites/default/files/styles/12_6_media_huge/public/2026-04/2026-04-21-taiwan-crisis-hormuz-2188726519.jpg?h=01fa2516&itok=wGc89UJq — 200 — 186.1 KiB — 57 ms — h3https://www.chathamhouse.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.chathamhouse.org/cdn-cgi/script... https://www.chathamhouse.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 739 B — 7 ms — h3https://www.chathamhouse.org/sites/default/files/js/js_-aXP4IA56tu3ib3n-PM1OtQL2kbdigDMdlbapGXuK_E.js?scope=footer&delta=0&language=en&theme=numiko&include=eJyVjjEOwyAQBD-Ew5PQAhdzMnDogCT-fShSOoXbkUYzEQMZJ6n1lPBi0W6oTe-UEEndU1HoLXrYS_oIUgpqvCcl7kP03ND4lvcDdX3uGCzV0aetuqmz8CF2z-KRtx6U2-imEzQktyoOc8habZkG2T_8C9eeauIwww.chathamhouse.org/sites/default/... https://www.chathamhouse.org/sites/default/files/js/js_-aXP4IA56tu3ib3n-PM1OtQL2kbdigDMdlbapGXuK_E.js?scope=footer&delta=0&language=en&theme=numiko&include=eJyVjjEOwyAQBD-Ew5PQAhdzMnDogCT-fShSOoXbkUYzEQMZJ6n1lPBi0W6oTe-UEEndU1HoLXrYS_oIUgpqvCcl7kP03ND4lvcDdX3uGCzV0aetuqmz8CF2z-KRtx6U2-imEzQktyoOc8habZkG2T_8C9eeauI — 200 — 54.3 KiB — 43 ms — h3https://unpkg.com/imagesloaded@4/imagesloaded.pkgd.min.jsunpkg.com/imagesloaded@4/imagesload... https://unpkg.com/imagesloaded@4/imagesloaded.pkgd.min.js — 302 — 309 B — 169 ms — h3https://cdn.jsdelivr.net/npm/jquery.scrollto@2.1.2/jquery.scrollTo.min.jscdn.jsdelivr.net/npm/jquery.scrollt... https://cdn.jsdelivr.net/npm/jquery.scrollto@2.1.2/jquery.scrollTo.min.js — 200 — 2.0 KiB — 51 ms — h2https://www.chathamhouse.org/sites/default/files/js/js_j_Cgtn-K5gOYhKprdAd7R7N40VDhwhJWYR08vuN80lQ.js?scope=footer&delta=3&language=en&theme=numiko&include=eJyVjjEOwyAQBD-Ew5PQAhdzMnDogCT-fShSOoXbkUYzEQMZJ6n1lPBi0W6oTe-UEEndU1HoLXrYS_oIUgpqvCcl7kP03ND4lvcDdX3uGCzV0aetuqmz8CF2z-KRtx6U2-imEzQktyoOc8habZkG2T_8C9eeauIwww.chathamhouse.org/sites/default/... https://www.chathamhouse.org/sites/default/files/js/js_j_Cgtn-K5gOYhKprdAd7R7N40VDhwhJWYR08vuN80lQ.js?scope=footer&delta=3&language=en&theme=numiko&include=eJyVjjEOwyAQBD-Ew5PQAhdzMnDogCT-fShSOoXbkUYzEQMZJ6n1lPBi0W6oTe-UEEndU1HoLXrYS_oIUgpqvCcl7kP03ND4lvcDdX3uGCzV0aetuqmz8CF2z-KRtx6U2-imEzQktyoOc8habZkG2T_8C9eeauI — 200 — 110.1 KiB — 44 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 53 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 1079ms · 561KB · $14/mo
www.chathamhouse.org
Other
Costly
Execution 228ms
Transfer 51 KB
Monthly Cost $3/mo
www.chathamhouse.org
Other
Costly
Execution 207ms
Transfer 110 KB
Unused 70%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 171ms
Transfer 155 KB
Unused 36%
Monthly Cost $2/mo
consent.cookiebot.com
Other
Optional
Execution 139ms
Transfer 80 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 137ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 164 KB
Unused 41%
Monthly Cost $1/mo
www.chathamhouse.org
Other
Optional
Execution 95ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.chathamhouse.org adds 228ms and costs ~$3/month
  • www.chathamhouse.org adds 207ms 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.chathamhouse.org takes 228ms 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.chathamhouse.org 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

70% of www.chathamhouse.org'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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