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https://cepr.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
73
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.
77
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.

862 ms

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

2.48 s

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

41 ms

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

0.226

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

1.42 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.

2.98 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
8 PASS 4 REVIEW 1 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 60 requests
FIX
3.9 MB transferred, 60 requests
Warning::
Page weighs 5.4 MB (3.9 MB transferred)
Warning::
Images are 3.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.3 MB
Info::
60 HTTP requests
Info::
Estimated 0.82 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
60 requests
0.82 g CO2 per page load
Images 3.3 MiB 85%
JavaScript 457.7 KiB 11%
Fonts 77.8 KiB 2%
CSS 35.2 KiB 1%
HTML 26.4 KiB 1%
Other 8.5 KiB 0%
Other 2.2 KiB 0%
Other 1.1 KiB 0%
Other 996 B 0%
0 2.4 MB 4.9 MB
Over budget

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

B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 3.3 MB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
867ms total JS execution
REVIEW
867ms total JS execution
Info::
https://cepr.org/: 206ms CPU time
Info::
Unattributable: 161ms CPU time
Info::
https://cepr.org/sites/default/files/js/js_zkhgQK5...: 139ms CPU time
Info::
https://cepr.org/cdn-cgi/challenge-platform/script...: 107ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-78MF...: 106ms CPU time
Info::
Third-party scripts: 351ms (40% of total)

Main Thread Breakdown

Script Evaluation 43% Other 24% Style & Layout 17% Script Parsing & Compilation 8% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://cepr.org/206ms17ms1ms1st
Unattributable161ms3ms0ms3rd
https://cepr.org/sites/default/files/js/js_zkhgQK5Xfm-3vNsqA2UfQ9VMFaiq3J9HVoCYwtMA-Wo.js?scope=header&delta=0&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A139ms57ms5ms1st
https://cepr.org/cdn-cgi/challenge-platform/scripts/jsd/main.js107ms103ms1ms1st
https://www.googletagmanager.com/gtag/js?id=G-78MFZJW65N&cx=c&gtm=4e64m0h2106ms85ms20ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PHC2J8R83ms65ms17ms3rd
https://cepr.org/sites/default/files/js/js_C_RsM-H52oO-nWGVjh4GzsLWeX2aTZQ4Wbm8q88gVkQ.js?scope=footer&delta=2&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A64ms39ms19ms1st
C
JS Bundles
Action
12 scripts, 209 KB unused
REVIEW
12 scripts, 209 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PHC...: 69 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-78MF...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cepr.org/sites/default/files/js/js_C_RsM-H...: 39 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cepr.org/sites/default/files/js/js_AT43IVq...: 36 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 209 KB
209 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PHC2J8R138 KB69 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-78MFZJW65N&cx=c&gtm=4e64m0h2152 KB65 KB (43%)✓3rd
https://cepr.org/sites/default/files/js/js_C_RsM-H52oO-nWGVjh4GzsLWeX2aTZQ4Wbm8q88gVkQ.js?scope=footer&delta=2&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A51 KB39 KB (76%)✓1st
https://cepr.org/sites/default/files/js/js_AT43IVqq0aMlBRt7nVoYaiGNYUML6oaXNN8a4QLny28.js?scope=footer&delta=4&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A50 KB36 KB (72%)✓1st
https://cepr.org/sites/default/files/js/js_zkhgQK5Xfm-3vNsqA2UfQ9VMFaiq3J9HVoCYwtMA-Wo.js?scope=header&delta=0&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A33 KB—✓1st
https://cepr.org/sites/default/files/js/js_7up_xlB2vMJV675PolB5FrnOUFkTtTZJhik982WDPpw.js?scope=footer&delta=0&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A2 KB—✓1st
https://cdnjs.cloudflare.com/ajax/libs/jquery-throttle-debounce/1.1/jquery.ba-throttle-debounce.min.js1 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/svg4everybody/2.1.9/svg4everybody.min.js1 KB—✓3rd
https://cepr.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?11 KB—✓1st
https://sidebar.bugherd.com/embed.js?apikey=n55oqaersfxg8q7cixtwkg8 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

C
Page Weight Inventory
Action
60 resources · 3.9 MB · 209 KB savings available
REVIEW
60 resources · 3.9 MB · 209 KB savings available
Warning::
Page weight 2.9 MB over 1MB target
Got: 3.9 MB Expected: ≤ 1 MB
Info::
~209 KB of savings available
Info::
21 third-party resources (10% of weight)
Info::
5 resources over 200KB
60 resources · 3.9 MiB · 21 third-party 2.9 MiB over 1MB target
Image 85% · 3.3 MiB
JavaScript 11% · 457.7 KiB
Font 2% · 77.8 KiB
CSS 1% · 35.2 KiB
Document 1% · 26.4 KiB
Other 0% · 4.9 KiB

~208.9 KiB of savings available

Remove unused JavaScript: 208.9 KiB
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 (404.6 KiB of 3.9 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
4 fonts (78 KB)
PASS
4 fonts (78 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

78 KB total

Render-blocking

0

of 4

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 2.5 s FCP 862 ms LCP 2.5 shttps://use.typekit.net/af/630ec8/00000000000000003b9ae7f8/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/630ec8/00000000000000003b9ae7f8/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 19.5 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/sourceserifpro/v18/neIQzD-0qpwxpaWvjeD0X88SAOeauXQ-oAGIyY0.woff2neIQzD-0qpwxpaWvjeD0X88... https://fonts.gstatic.com/s/sourceserifpro/v18/neIQzD-0qpwxpaWvjeD0X88SAOeauXQ-oAGIyY0.woff2 — 20.0 KiB — 8 ms — font-display: swaphttps://use.typekit.net/af/20ad3a/00000000000000003b9ae7f7/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/20ad3a/00000000000000003b9ae7f7/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 19.2 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/e5199f/00000000000000003b9ae7f4/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/e5199f/00000000000000003b9ae7f4/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 19.0 KiB — 5 ms — font-display: swap
l woff2 swap
Size 20 KB
Load time 16 ms
Start 584 ms
Risk FOUT — text flashes from fallback to web font
neIQzD-0qpwxpaWvjeD0X88... woff2 swap
Size 20 KB
Load time 8 ms
Start 585 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 17 ms
Start 585 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 5 ms
Start 712 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

A+
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600, public
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
Last-Modified header present
Cache-Control

max-age=3600, public

DirectiveValueMeaning
max-age3600Cache for 1 hour
public—Any cache may store this response
Effective TTL: 3600 seconds
Network Waterfall
60 requests over 1269ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 862 ms LCP 2.5 shttps://cepr.org// https://cepr.org/ — 200 — 20.9 KiB — 125 ms — h3https://cepr.org/sites/default/files/css/css_bNL711l4WmatscF3-W4gpYkf4CcCFONLjzxGIKUSqpw.css?delta=0&language=en&theme=cepr&include=eJxtjkEOwjAMBD8U6idFjmu1Vp04shtQeT2FCnHhshrN7mFRACUvagU1EXeHi2-xHyptSaQYcUDB4C9XjsCFI5HVyk6cCX2Hd-SiRttZOEMzr6jy5MQjk9km59BqV8FGDP9kLuicOjoujn0NmH101OlnptH6KCqx8pziiJ3r9e0u_Aj45FRtHsovfvhViA/sites/default/files/css/css_bNL711... https://cepr.org/sites/default/files/css/css_bNL711l4WmatscF3-W4gpYkf4CcCFONLjzxGIKUSqpw.css?delta=0&language=en&theme=cepr&include=eJxtjkEOwjAMBD8U6idFjmu1Vp04shtQeT2FCnHhshrN7mFRACUvagU1EXeHi2-xHyptSaQYcUDB4C9XjsCFI5HVyk6cCX2Hd-SiRttZOEMzr6jy5MQjk9km59BqV8FGDP9kLuicOjoujn0NmH101OlnptH6KCqx8pziiJ3r9e0u_Aj45FRtHsovfvhViA — 200 — 3.1 KiB — 14 ms — h3https://cepr.org/sites/default/files/css/css_2sV4yAJoWIMWVsyGwv-LMTiNevaQ-zz8yDG_f9fmOZk.css?delta=1&language=en&theme=cepr&include=eJxtjkEOwjAMBD8U6idFjmu1Vp04shtQeT2FCnHhshrN7mFRACUvagU1EXeHi2-xHyptSaQYcUDB4C9XjsCFI5HVyk6cCX2Hd-SiRttZOEMzr6jy5MQjk9km59BqV8FGDP9kLuicOjoujn0NmH101OlnptH6KCqx8pziiJ3r9e0u_Aj45FRtHsovfvhViA/sites/default/files/css/css_2sV4yA... https://cepr.org/sites/default/files/css/css_2sV4yAJoWIMWVsyGwv-LMTiNevaQ-zz8yDG_f9fmOZk.css?delta=1&language=en&theme=cepr&include=eJxtjkEOwjAMBD8U6idFjmu1Vp04shtQeT2FCnHhshrN7mFRACUvagU1EXeHi2-xHyptSaQYcUDB4C9XjsCFI5HVyk6cCX2Hd-SiRttZOEMzr6jy5MQjk9km59BqV8FGDP9kLuicOjoujn0NmH101OlnptH6KCqx8pziiJ3r9e0u_Aj45FRtHsovfvhViA — 200 — 26.6 KiB — 33 ms — h3https://use.typekit.net/oub2dog.cssuse.typekit.net/oub2dog.css https://use.typekit.net/oub2dog.css — 200 — 2.1 KiB — 38 ms — h2https://fonts.googleapis.com/css2?family=Source+Serif+Pro:ital,wght@0,400;0,700;1,400;1,700&display=swapfonts.googleapis.com/css2?family=So... https://fonts.googleapis.com/css2?family=Source+Serif+Pro:ital,wght@0,400;0,700;1,400;1,700&display=swap — 200 — 1.3 KiB — 44 ms — h2https://cdnjs.cloudflare.com/ajax/libs/magnific-popup.js/1.1.0/magnific-popup.min.csscdnjs.cloudflare.com/ajax/libs/magn... https://cdnjs.cloudflare.com/ajax/libs/magnific-popup.js/1.1.0/magnific-popup.min.css — 200 — 1.9 KiB — 29 ms — h3https://cepr.org/sites/default/files/js/js_zkhgQK5Xfm-3vNsqA2UfQ9VMFaiq3J9HVoCYwtMA-Wo.js?scope=header&delta=0&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A/sites/default/files/js/js_zkhgQK5X... https://cepr.org/sites/default/files/js/js_zkhgQK5Xfm-3vNsqA2UfQ9VMFaiq3J9HVoCYwtMA-Wo.js?scope=header&delta=0&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A — 200 — 33.1 KiB — 37 ms — h3https://cepr.org/sites/default/files/styles/16_9_large/public/2026-02/Untitled-2%20%281%29.webp?itok=7bGFBal9/sites/default/files/styles/16_9_la... https://cepr.org/sites/default/files/styles/16_9_large/public/2026-02/Untitled-2%20%281%29.webp?itok=7bGFBal9 — 200 — 213.8 KiB — 56 ms — h3https://cepr.org/sites/default/files/styles/16_9_large/public/2026-02/Untitled-6%20%281%29.webp?itok=oU0L0Fda/sites/default/files/styles/16_9_la... https://cepr.org/sites/default/files/styles/16_9_large/public/2026-02/Untitled-6%20%281%29.webp?itok=oU0L0Fda — 200 — 163.7 KiB — 53 ms — h3https://p.typekit.net/p.css?s=1&k=oub2dog&ht=tk&f=31135.31136.31137.31138.31139.31140.31141.31142.31143.31144.31145.31146.31147.31148.31149.31150.31154.31155.31156.31157.31158.31159.31160.31161.31162.31163.31164.31165.31166.31167.31168.31169.31170&a=38573310&app=typekit&e=cssp.typekit.net/p.css?s=1&k=oub2dog&h... https://p.typekit.net/p.css?s=1&k=oub2dog&ht=tk&f=31135.31136.31137.31138.31139.31140.31141.31142.31143.31144.31145.31146.31147.31148.31149.31150.31154.31155.31156.31157.31158.31159.31160.31161.31162.31163.31164.31165.31166.31167.31168.31169.31170&a=38573310&app=typekit&e=css — 200 — 172 B — 284 ms — h2https://cepr.org/sites/default/files/styles/16_9_large/public/2026-02/Untitled-4%20%282%29.webp?itok=Bph2d5S-/sites/default/files/styles/16_9_la... https://cepr.org/sites/default/files/styles/16_9_large/public/2026-02/Untitled-4%20%282%29.webp?itok=Bph2d5S- — 200 — 237.0 KiB — 23 ms — h3https://cepr.org/sites/default/files/styles/portrait_standard/public/2026-04/CleanShot%202026-04-11%20at%2012.37.30.webp?itok=jqCsVWdD/sites/default/files/styles/portrai... https://cepr.org/sites/default/files/styles/portrait_standard/public/2026-04/CleanShot%202026-04-11%20at%2012.37.30.webp?itok=jqCsVWdD — 200 — 17.5 KiB — 14 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
40% of JavaScript execution is third-party
First-party Third-party 351ms · 290KB · €4/mo
Unattributable
Other
Optional
Execution 161ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 106ms
Transfer 152 KB
Unused 43%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 138 KB
Unused 51%
Monthly Cost €1/mo

40% 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

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

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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