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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
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.

4.15 s

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

13.98 s

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

878 ms

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

0.056

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

6.05 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.

14.34 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
9 PASS 1 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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4719ms total JS execution
FIX
4719ms total JS execution
Warning::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 1631ms CPU time
Warning::
https://www.cfr.org/: 1033ms CPU time
Warning::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 535ms CPU time
Warning::
Unattributable: 534ms CPU time
Info::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 199ms CPU time
Warning::
Third-party scripts: 4719ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 18% Style & Layout 18% Script Parsing & Compilation 10% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0jhc2yqq0lu3-.js1631ms1175ms22ms3rd
https://www.cfr.org/1033ms46ms180ms3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0j.m_msnf_6zq.js535ms157ms9ms3rd
Unattributable534ms90ms0ms3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/turbopack-135a7y5hkbisa.js199ms197ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N55RCSQL182ms133ms45ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VS4QCJRPE1&cx=c&gtm=4e64h1173ms125ms46ms3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/010.lt2eljym9.js99ms62ms15ms3rd
https://cdn.parsely.com/keys/cfr.org/p.js?gtm_ver=3.295ms83ms8ms3rd
https://ak.sail-horizon.com/spm/spm.v1.min.js67ms52ms14ms3rd

Showing top 10 of 13 scripts

D
JS Bundles
Action
38 scripts, 399 KB unused
FIX
38 scripts, 399 KB unused
Warning::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 106 KB unused (97%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VS4Q...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N55...: 62 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 36 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 35 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 399 KB
399 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0kywh35p1ammu.js110 KB106 KB (97%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-VS4QCJRPE1&cx=c&gtm=4e64h1157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N55RCSQL121 KB62 KB (51%)✓3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0nwmznekjs1df.js88 KB36 KB (43%)✓3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0p_4bsm16tirh.js44 KB35 KB (79%)✓3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/17cdnhwn6ph-_.js37 KB34 KB (93%)✓3rd
https://ak.sail-horizon.com/spm/spm.v1.min.js48 KB32 KB (68%)✓3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0jhc2yqq0lu3-.js71 KB26 KB (37%)✓3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/09ir6kyzactq~.js12 KB—✓3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0012xtmnavi0n.js0 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
85 resources · 1.8 MB · 399 KB savings available
FIX
85 resources · 1.8 MB · 399 KB savings available
Warning::
Page weight 838 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~399 KB of savings available
Warning::
84 third-party resources (100% of weight)
85 resources · 1.8 MiB · 84 third-party 838.4 KiB over 1MB target
JavaScript 55% · 1018.9 KiB
Font 30% · 553.7 KiB
Document 8% · 153.1 KiB
Image 5% · 95.8 KiB
CSS 1% · 25.8 KiB
Other 1% · 15.1 KiB

~398.7 KiB of savings available

Remove unused JavaScript: 398.7 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
1.8 MB transferred, 85 requests
REVIEW
1.8 MB transferred, 85 requests
Info::
Page weighs 4.9 MB (1.8 MB transferred)
Warning::
JavaScript is 1019 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1019 KB
Info::
Fonts are 554 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 554 KB
Info::
85 HTTP requests
Info::
Estimated 0.38 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
85 requests
0.38 g CO2 per page load
JavaScript 1018.9 KiB 55%
Fonts 553.7 KiB 30%
HTML 153.1 KiB 8%
Images 93.3 KiB 5%
CSS 25.8 KiB 1%
Other 13.5 KiB 1%
Other 2.6 KiB 0%
Other 1.5 KiB 0%
Other 0 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

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

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
Image Optimization
6 images, 0 KB saveable
PASS
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 93 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
12 fonts (554 KB)
PASS
12 fonts (554 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

554 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.1 s LCP 14.0 shttps://static.cfr.org/cfr/e07c6fa/_next/static/media/36363bfb06833f56-s.p.0-pny06~-x26a.woff236363bfb06833f56-s.p.0-... https://static.cfr.org/cfr/e07c6fa/_next/static/media/36363bfb06833f56-s.p.0-pny06~-x26a.woff2 — 9.3 KiB — 207 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Bold-s.p.0yagphei6cukh.woff2SeasonSans_Bold-s.p.0ya... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Bold-s.p.0yagphei6cukh.woff2 — 49.6 KiB — 216 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_BoldItalic-s.p.0_xomq4cdx6r2.woff2SeasonSans_BoldItalic-s... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_BoldItalic-s.p.0_xomq4cdx6r2.woff2 — 52.7 KiB — 178 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Medium-s.p.139vek-bhq2dg.woff2SeasonSans_Medium-s.p.1... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Medium-s.p.139vek-bhq2dg.woff2 — 49.5 KiB — 216 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_MediumItalic-s.p.0tm0mv8bps_hw.woff2SeasonSans_MediumItalic... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_MediumItalic-s.p.0tm0mv8bps_hw.woff2 — 52.7 KiB — 223 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Regular-s.p.0y5c0_rblp62f.woff2SeasonSans_Regular-s.p.... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Regular-s.p.0y5c0_rblp62f.woff2 — 49.7 KiB — 229 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_RegularItalic-s.p.0~w9y6i1ya27l.woff2SeasonSans_RegularItali... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_RegularItalic-s.p.0~w9y6i1ya27l.woff2 — 52.0 KiB — 231 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_SemiBold-s.p.0eht1pj2bq0uk.woff2SeasonSans_SemiBold-s.p... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_SemiBold-s.p.0eht1pj2bq0uk.woff2 — 49.8 KiB — 229 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_SemiBoldItalic-s.p.17x7mkklvd60u.woff2SeasonSans_SemiBoldItal... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_SemiBoldItalic-s.p.17x7mkklvd60u.woff2 — 52.8 KiB — 231 ms — font-display: swaphttps://static.cfr.org/cfr/e07c6fa/_next/static/media/a73419dd2ba2d841-s.p.0x-0vqtj_fzf1.woff2a73419dd2ba2d841-s.p.0x... https://static.cfr.org/cfr/e07c6fa/_next/static/media/a73419dd2ba2d841-s.p.0x-0vqtj_fzf1.woff2 — 8.9 KiB — 229 ms — font-display: swaphttps://use.typekit.net/af/7aefe0/00000000000000007735d883/31/l?subset_id=2&fvd=i4&v=3l https://use.typekit.net/af/7aefe0/00000000000000007735d883/31/l?subset_id=2&fvd=i4&v=3 — 26.6 KiB — 13 ms — font-display: swaphttps://use.typekit.net/af/c9b150/00000000000000007735d880/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/c9b150/00000000000000007735d880/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 100.0 KiB — 17 ms — font-display: swap
36363bfb06833f56-s.p.0-... woff2 swap
Size 9 KB
Load time 207 ms
Start 685 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_Bold-s.p.0ya... woff2 swap
Size 50 KB
Load time 216 ms
Start 685 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_BoldItalic-s... woff2 swap
Size 53 KB
Load time 178 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_Medium-s.p.1... woff2 swap
Size 50 KB
Load time 216 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_MediumItalic... woff2 swap
Size 53 KB
Load time 223 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_Regular-s.p.... woff2 swap
Size 50 KB
Load time 229 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_RegularItali... woff2 swap
Size 52 KB
Load time 231 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_SemiBold-s.p... woff2 swap
Size 50 KB
Load time 229 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_SemiBoldItal... woff2 swap
Size 53 KB
Load time 231 ms
Start 687 ms
Risk FOUT — text flashes from fallback to web font
a73419dd2ba2d841-s.p.0x... woff2 swap
Size 9 KB
Load time 229 ms
Start 687 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 13 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 100 KB
Load time 17 ms
Start 1.1 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)
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
13 hints, 0 missing preconnects
PASS
13 hints, 0 missing preconnects
Info::
Page uses 13 resource hint(s)

Current Resource Hints

preconnect
—
preload
+3
13
dns-prefetch
—
prefetch
—

13 resource hints configured

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
85 requests over 2695ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.1 s LCP 14.0 shttps://cfr.org// https://cfr.org/ — 301 — 150 B — 65 ms — h2https://www.cfr.org/www.cfr.org/ https://www.cfr.org/ — 200 — 153.1 KiB — 845 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/36363bfb06833f56-s.p.0-pny06~-x26a.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/36363bfb06833f56-s.p.0-pny06~-x26a.woff2 — 200 — 9.3 KiB — 207 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Bold-s.p.0yagphei6cukh.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Bold-s.p.0yagphei6cukh.woff2 — 200 — 49.6 KiB — 216 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_BoldItalic-s.p.0_xomq4cdx6r2.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_BoldItalic-s.p.0_xomq4cdx6r2.woff2 — 200 — 52.7 KiB — 178 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Medium-s.p.139vek-bhq2dg.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Medium-s.p.139vek-bhq2dg.woff2 — 200 — 49.5 KiB — 216 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_MediumItalic-s.p.0tm0mv8bps_hw.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_MediumItalic-s.p.0tm0mv8bps_hw.woff2 — 200 — 52.7 KiB — 223 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Regular-s.p.0y5c0_rblp62f.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_Regular-s.p.0y5c0_rblp62f.woff2 — 200 — 49.7 KiB — 229 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_RegularItalic-s.p.0~w9y6i1ya27l.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_RegularItalic-s.p.0~w9y6i1ya27l.woff2 — 200 — 52.0 KiB — 231 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_SemiBold-s.p.0eht1pj2bq0uk.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_SemiBold-s.p.0eht1pj2bq0uk.woff2 — 200 — 49.8 KiB — 229 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_SemiBoldItalic-s.p.17x7mkklvd60u.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/SeasonSans_SemiBoldItalic-s.p.17x7mkklvd60u.woff2 — 200 — 52.8 KiB — 231 ms — h2https://static.cfr.org/cfr/e07c6fa/_next/static/media/a73419dd2ba2d841-s.p.0x-0vqtj_fzf1.woff2static.cfr.org/cfr/e07c6fa/_next/st... https://static.cfr.org/cfr/e07c6fa/_next/static/media/a73419dd2ba2d841-s.p.0x-0vqtj_fzf1.woff2 — 200 — 8.9 KiB — 229 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 4719ms · 677KB · €51/mo
static.cfr.org
Other
Costly
Execution 1631ms
Transfer 71 KB
Unused 37%
Monthly Cost €18/mo
www.cfr.org
Other
Costly
Execution 1033ms
Transfer 153 KB
Monthly Cost €11/mo
static.cfr.org
Other
Costly
Execution 535ms
Transfer 33 KB
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 534ms
Transfer 0 KB
Monthly Cost €6/mo
static.cfr.org
Other
Optional
Execution 199ms
Transfer 4 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 182ms
Transfer 121 KB
Unused 51%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 173ms
Transfer 157 KB
Unused 42%
Monthly Cost €2/mo
static.cfr.org
Other
Optional
Execution 99ms
Transfer 38 KB
Monthly Cost €1/mo
cdn.parsely.com
Other
Optional
Execution 95ms
Transfer 24 KB
Monthly Cost €1/mo
ak.sail-horizon.com
Other
Optional
Execution 67ms
Transfer 48 KB
Unused 68%
Monthly Cost €1/mo
static.cloudflareinsights.com
Other
Optional
Execution 64ms
Transfer 11 KB
Monthly Cost €1/mo
static.cfr.org
Other
Optional
Execution 57ms
Transfer 4 KB
Monthly Cost €1/mo
cdn.browsee.io
Other
Optional
Execution 52ms
Transfer 13 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • static.cfr.org adds 1631ms and costs ~€18/month
  • www.cfr.org adds 1033ms and costs ~€11/month
  • static.cfr.org adds 535ms and costs ~€6/month
  • Unattributable adds 534ms 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

static.cfr.org takes 1631ms 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.cfr.org takes 1033ms 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.cfr.org takes 535ms 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 534ms 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

51% 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

68% of ak.sail-horizon.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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