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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
44
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.

2.48 s

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

7.26 s

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

1.52 s

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

0.085

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

3.80 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.

11.40 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
17
8 PASS 2 REVIEW 5 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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5000ms total JS execution
FIX
5000ms total JS execution
Warning::
https://www.chathamhouse.org/sites/default/files/j...: 1290ms CPU time
Warning::
https://www.chathamhouse.org/: 807ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WJH...: 637ms CPU time
Warning::
https://consent.cookiebot.com/796ddad9-17f7-4a51-b...: 587ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KXVP...: 446ms CPU time
Warning::
Third-party scripts: 5000ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Style & Layout 23% Other 10% Parse HTML & CSS 7% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
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_8C9eeauI1290ms516ms50ms3rd
https://www.chathamhouse.org/807ms83ms7ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WJHKX9N637ms548ms79ms3rd
https://consent.cookiebot.com/796ddad9-17f7-4a51-b083-b45cd0d63f0b/cc.js?renew=false&referer=www.chathamhouse.org&dnt=false&init=false587ms241ms76ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KXVPBXNKBQ&cx=c&gtm=4e64k0446ms372ms70ms3rd
https://www.chathamhouse.org/cdn-cgi/challenge-platform/scripts/jsd/main.js357ms345ms4ms3rd
Unattributable348ms9ms0ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js203ms163ms31ms3rd
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_8C9eeauI137ms111ms23ms3rd
https://consent.cookiebot.com/uc.js?cbid=796ddad9-17f7-4a51-b083-b45cd0d63f0b&implementation=gtm&consentmode-dataredaction=dynamic133ms109ms15ms3rd

Showing top 10 of 11 scripts

D
JS Bundles
Action
13 scripts, 312 KB unused
FIX
13 scripts, 312 KB unused
Warning::
https://www.chathamhouse.org/sites/default/files/j...: 76 KB unused (69%)
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...: 53 KB unused (34%)
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: 312 KB
312 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 KB76 KB (69%)✓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 KB53 KB (34%)✓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://consent.cookiebot.com/796ddad9-17f7-4a51-b083-b45cd0d63f0b/cc.js?renew=false&referer=www.chathamhouse.org&dnt=false&init=false105 KB25 KB (24%)✓3rd
https://consent.cookiebot.com/uc.js?cbid=796ddad9-17f7-4a51-b083-b45cd0d63f0b&implementation=gtm&consentmode-dataredaction=dynamic36 KB23 KB (64%)✓3rd
https://unpkg.com/imagesloaded@4.1.4/imagesloaded.pkgd.min.js2 KB—✓3rd
https://www.chathamhouse.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?11 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

D
Page Weight Inventory
Action
47 resources · 1.6 MB · 312 KB savings available
FIX
47 resources · 1.6 MB · 312 KB savings available
Warning::
Page weight 584 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~312 KB of savings available
Warning::
46 third-party resources (100% of weight)
47 resources · 1.6 MiB · 46 third-party 583.7 KiB over 1MB target
JavaScript 44% · 714.9 KiB
Image 40% · 650.1 KiB
Font 9% · 146.0 KiB
Document 3% · 51.5 KiB
CSS 3% · 42.0 KiB
Other 0% · 3.2 KiB

~312.3 KiB of savings available

Remove unused JavaScript: 312.3 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.

C
Page Weight Budget
Action
1.6 MB transferred, 47 requests
REVIEW
1.6 MB transferred, 47 requests
Info::
Page weighs 3.7 MB (1.6 MB transferred)
Warning::
JavaScript is 715 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 715 KB
Info::
47 HTTP requests
Info::
Estimated 0.33 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
47 requests
0.33 g CO2 per page load
JavaScript 714.9 KiB 44%
Images 648.9 KiB 40%
Fonts 146.0 KiB 9%
HTML 51.5 KiB 3%
CSS 42.0 KiB 3%
Other 2.0 KiB 0%
Other 2.0 KiB 0%
Other 553 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Info::
All images are well-optimized
16 images 649 KB
0 oversized -0 KB
15 legacy format
0 missing dimensions CLS risk
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.5 s LCP 7.3 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 — 50 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 — 50 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 — 54 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 — 49 ms — font-display: swap
CalibreWeb-Bold.woff2 woff2 swap
Size 32 KB
Load time 40 ms
Start 90 ms
Risk FOUT — text flashes from fallback to web font
CalibreWeb-Regular.woff2 woff2 swap
Size 31 KB
Load time 50 ms
Start 90 ms
Risk FOUT — text flashes from fallback to web font
CalibreWeb-Semibold.woff2 woff2 swap
Size 31 KB
Load time 50 ms
Start 90 ms
Risk FOUT — text flashes from fallback to web font
CharterITCWeb-Regular.w... woff2 swap
Size 21 KB
Load time 54 ms
Start 91 ms
Risk FOUT — text flashes from fallback to web font
CalibreWeb-Medium.woff2 woff2 swap
Size 30 KB
Load time 49 ms
Start 253 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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
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
47 requests over 3072ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.5 s LCP 7.3 shttps://chathamhouse.org// https://chathamhouse.org/ — 301 — 213 B — 24 ms — h3https://www.chathamhouse.org/www.chathamhouse.org/ https://www.chathamhouse.org/ — 200 — 50.7 KiB — 49 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 — 50 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 — 50 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 — 54 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 — 26 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 — 48 ms — h3https://www.chathamhouse.org/sites/default/files/styles/12_6_media_small/public/2026-04/2026-04-21-taiwan-crisis-hormuz-2188726519.jpg?h=01fa2516&itok=4AP3daaywww.chathamhouse.org/sites/default/... https://www.chathamhouse.org/sites/default/files/styles/12_6_media_small/public/2026-04/2026-04-21-taiwan-crisis-hormuz-2188726519.jpg?h=01fa2516&itok=4AP3daay — 200 — 47.9 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 — 15 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 — 54 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 — 58 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 — 1.7 KiB — 54 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 5000ms · 743KB · $66/mo
www.chathamhouse.org
Other
Costly
Execution 1290ms
Transfer 110 KB
Unused 69%
Monthly Cost $17/mo
www.chathamhouse.org
Other
Costly
Execution 807ms
Transfer 51 KB
Monthly Cost $11/mo
Google Tag Manager
Tag Manager
Costly
Execution 637ms
Transfer 155 KB
Unused 34%
Monthly Cost $8/mo
consent.cookiebot.com
Other
Costly
Execution 587ms
Transfer 105 KB
Unused 24%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 446ms
Transfer 164 KB
Unused 41%
Monthly Cost $6/mo
www.chathamhouse.org
Other
Costly
Execution 357ms
Transfer 0 KB
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 348ms
Transfer 0 KB
Monthly Cost $5/mo
Hotjar
Session Replay
Costly
Execution 203ms
Transfer 57 KB
Unused 65%
Monthly Cost $3/mo
www.chathamhouse.org
Other
Optional
Execution 137ms
Transfer 54 KB
Unused 59%
Monthly Cost $2/mo
consent.cookiebot.com
Other
Optional
Execution 133ms
Transfer 36 KB
Unused 64%
Monthly Cost $2/mo
static.cloudflareinsights.com
Other
Optional
Execution 54ms
Transfer 11 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.chathamhouse.org adds 1290ms and costs ~$17/month
  • www.chathamhouse.org adds 807ms and costs ~$11/month
  • Google Tag Manager adds 637ms and costs ~$8/month
  • consent.cookiebot.com adds 587ms and costs ~$8/month
  • Google Tag Manager adds 446ms and costs ~$6/month
  • www.chathamhouse.org adds 357ms and costs ~$5/month
  • Unattributable adds 348ms and costs ~$5/month
  • Hotjar adds 203ms 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 1290ms 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

69% 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

www.chathamhouse.org takes 807ms 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

Google Tag Manager takes 637ms 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

consent.cookiebot.com takes 587ms 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

Google Tag Manager takes 446ms 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 357ms 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

Unattributable takes 348ms 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

Hotjar takes 203ms 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

65% of Hotjar'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

59% 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

64% of consent.cookiebot.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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