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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
77
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.

1.17 s

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

2.93 s

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

66 ms

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

0.084

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

1.59 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.

2.94 s

Page Load Progression

606 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
15
7 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
3.2 MB transferred, 106 requests
FIX
3.2 MB transferred, 106 requests
Warning::
Page weighs 6.3 MB (3.2 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
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.67 g CO2 per page load
3.2 MB / 2.4 MB budget
3.2 MB transferred
106 requests
0.67 g CO2 per page load
Other 1.3 MiB 41%
JavaScript 1018.9 KiB 31%
Fonts 553.7 KiB 17%
HTML 153.4 KiB 5%
Images 133.8 KiB 4%
Other 28.4 KiB 1%
CSS 25.9 KiB 1%
Other 2.7 KiB 0%
Other 1.4 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (3.2 MiB of 3.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
38 scripts, 398 KB unused
FIX
38 scripts, 398 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: 398 KB
398 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=4e64h1h1157 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 KB25 KB (35%)✓3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/09ir6kyzactq~.js12 KB—✓3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0012xtmnavi0n.js1 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
106 resources · 3.2 MB · 398 KB savings available
FIX
106 resources · 3.2 MB · 398 KB savings available
Warning::
Page weight 2.2 MB over 1MB target
Got: 3.2 MB Expected: ≤ 1 MB
Info::
~398 KB of savings available
Warning::
105 third-party resources (100% of weight)
Info::
1 resources over 200KB
106 resources · 3.2 MiB · 105 third-party 2.2 MiB over 1MB target
Media 41% · 1.3 MiB
JavaScript 31% · 1018.9 KiB
Font 17% · 553.7 KiB
Document 5% · 153.4 KiB
Image 4% · 136.3 KiB
Other 1% · 30.0 KiB
CSS 1% · 25.9 KiB

~397.6 KiB of savings available

Remove unused JavaScript: 397.6 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
JS Execution Cost
Action
1240ms total JS execution
REVIEW
1240ms total JS execution
Warning::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 503ms CPU time
Warning::
https://www.cfr.org/: 262ms CPU time
Info::
Unattributable: 221ms CPU time
Info::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 196ms CPU time
Info::
https://static.cfr.org/cfr/e07c6fa/_next/static/ch...: 57ms CPU time
Warning::
Third-party scripts: 1240ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 23% Style & Layout 19% Script Parsing & Compilation 8% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0jhc2yqq0lu3-.js503ms355ms5ms3rd
https://www.cfr.org/262ms6ms39ms3rd
Unattributable221ms30ms0ms3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/0j.m_msnf_6zq.js196ms64ms4ms3rd
https://static.cfr.org/cfr/e07c6fa/_next/static/chunks/010.lt2eljym9.js57ms39ms3ms3rd
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
10 images, 0 KB saveable
PASS
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 134 KB
0 oversized -0 KB
3 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 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 2.9 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 — 103 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 — 50.0 KiB — 164 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 — 52.2 KiB — 150 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 — 155 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 — 155 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 — 162 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 — 162 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 — 139 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 — 114 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 — 137 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 — 18 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 — 16 ms — font-display: swap
36363bfb06833f56-s.p.0-... woff2 swap
Size 9 KB
Load time 103 ms
Start 366 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_Bold-s.p.0ya... woff2 swap
Size 50 KB
Load time 164 ms
Start 366 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_BoldItalic-s... woff2 swap
Size 52 KB
Load time 150 ms
Start 366 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_Medium-s.p.1... woff2 swap
Size 50 KB
Load time 155 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_MediumItalic... woff2 swap
Size 53 KB
Load time 155 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_Regular-s.p.... woff2 swap
Size 50 KB
Load time 162 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_RegularItali... woff2 swap
Size 52 KB
Load time 162 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_SemiBold-s.p... woff2 swap
Size 50 KB
Load time 139 ms
Start 367 ms
Risk FOUT — text flashes from fallback to web font
SeasonSans_SemiBoldItal... woff2 swap
Size 53 KB
Load time 114 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
a73419dd2ba2d841-s.p.0x... woff2 swap
Size 9 KB
Load time 137 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 18 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 100 KB
Load time 16 ms
Start 658 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
106 requests over 2638ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 2.9 shttps://cfr.org// https://cfr.org/ — 301 — 150 B — 58 ms — h2https://www.cfr.org/www.cfr.org/ https://www.cfr.org/ — 200 — 153.4 KiB — 374 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 — 103 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 — 50.0 KiB — 164 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 — 52.2 KiB — 150 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 — 155 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 — 155 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 — 162 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 — 162 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 — 139 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 — 114 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 — 137 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 1240ms · 296KB · €13/mo
static.cfr.org
Other
Costly
Execution 503ms
Transfer 71 KB
Unused 35%
Monthly Cost €5/mo
www.cfr.org
Other
Costly
Execution 262ms
Transfer 153 KB
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 221ms
Transfer 0 KB
Monthly Cost €2/mo
static.cfr.org
Other
Optional
Execution 196ms
Transfer 33 KB
Monthly Cost €2/mo
static.cfr.org
Other
Optional
Execution 57ms
Transfer 38 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • static.cfr.org adds 503ms and costs ~€5/month
  • www.cfr.org adds 262ms and costs ~€3/month
  • Unattributable adds 221ms and costs ~€2/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.

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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 503ms 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 262ms 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 221ms 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

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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