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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
4
PASS
10
INFO
2

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

Mobile Desktop
47
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

3.83 s

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

10.05 s

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

720 ms

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

0.001

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

4.42 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.

10.23 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
10 PASS 4 REVIEW 1 FIX
D
JS Execution Cost
Action
3374ms total JS execution
FIX
3374ms total JS execution
Warning::
https://cepr.org/: 717ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-78MF...: 559ms CPU time
Warning::
Unattributable: 519ms CPU time
Warning::
https://cepr.org/sites/default/files/js/js_zkhgQK5...: 471ms CPU time
Warning::
https://cepr.org/cdn-cgi/challenge-platform/script...: 440ms CPU time
Info::
Third-party scripts: 1401ms (42% of total)

Main Thread Breakdown

Script Evaluation 49% Other 20% Style & Layout 16% Script Parsing & Compilation 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://cepr.org/717ms71ms5ms1st
https://www.googletagmanager.com/gtag/js?id=G-78MFZJW65N&cx=c&gtm=4e64k1559ms479ms75ms3rd
Unattributable519ms12ms0ms3rd
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_ECAvcs1A471ms221ms14ms1st
https://cepr.org/cdn-cgi/challenge-platform/scripts/jsd/main.js440ms423ms5ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-PHC2J8R323ms250ms68ms3rd
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_ECAvcs1A253ms145ms87ms1st
https://cepr.org/sites/default/files/js/js_AT43IVqq0aMlBRt7nVoYaiGNYUML6oaXNN8a4QLny28.js?scope=footer&delta=4&language=en&theme=cepr&include=eJxtiUEOgCAMwD40syctYy64AI4M-L8aPXppk5YN2ShXT1whrXxo7PgZRHvg-7YhYX0OEG9NQ5SEY-IDStWlgC4S92L38dar8SmKf_ECAvcs1A91ms54ms30ms1st
B
Page Weight Budget
1.2 MB transferred, 60 requests
REVIEW
1.2 MB transferred, 60 requests
Info::
Page weighs 2.7 MB (1.2 MB transferred)
Info::
60 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
60 requests
0.24 g CO2 per page load
Images 581.0 KiB 49%
JavaScript 459.0 KiB 39%
Fonts 77.8 KiB 7%
CSS 35.1 KiB 3%
HTML 26.4 KiB 2%
Other 7.8 KiB 1%
Other 2.2 KiB 0%
Other 997 B 0%
Other 930 B 0%
0 2.4 MB 4.9 MB
Under budget
B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 581 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
12 scripts, 208 KB unused
REVIEW
12 scripts, 208 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PHC...: 70 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 (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cepr.org/sites/default/files/js/js_C_RsM-H...: 37 KB unused (74%)
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: 208 KB
208 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PHC2J8R138 KB70 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-78MFZJW65N&cx=c&gtm=4e64k1153 KB65 KB (42%)✓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 KB37 KB (74%)✓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?12 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

B
Page Weight Inventory
60 resources · 1.2 MB · 208 KB savings available
REVIEW
60 resources · 1.2 MB · 208 KB savings available
Warning::
Page weight 167 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~208 KB of savings available
Info::
21 third-party resources (34% of weight)
60 resources · 1.2 MiB · 21 third-party 167.1 KiB over 1MB target
Image 49% · 588.1 KiB
JavaScript 39% · 459.0 KiB
Font 7% · 77.8 KiB
CSS 3% · 35.1 KiB
Document 2% · 26.4 KiB
Other 0% · 4.8 KiB

~207.6 KiB of savings available

Remove unused JavaScript: 207.6 KiB
A
Third-Party Impact
34% third-party, 0 ms blocking
PASS
34% third-party, 0 ms blocking
Info::
Third-party code accounts for 34% of page weight (405.4 KiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
66%
34%
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.8 s LCP 10.1 shttps://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 — 22 ms — font-display: swaphttps://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 — 30 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 — 6 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 — 25 ms — font-display: swap
l woff2 swap
Size 19 KB
Load time 22 ms
Start 378 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 30 ms
Start 379 ms
Risk FOUT — text flashes from fallback to web font
neIQzD-0qpwxpaWvjeD0X88... woff2 swap
Size 20 KB
Load time 6 ms
Start 379 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 25 ms
Start 381 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

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 1263ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.8 s LCP 10.1 shttps://cepr.org// https://cepr.org/ — 200 — 20.9 KiB — 133 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 — 15 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 — 26.5 KiB — 27 ms — h3https://use.typekit.net/oub2dog.cssuse.typekit.net/oub2dog.css https://use.typekit.net/oub2dog.css — 200 — 2.1 KiB — 37 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 — 57 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 — 24 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 — 26 ms — h3https://cepr.org/sites/default/files/styles/16_9_small/public/2026-02/Untitled-2%20%281%29.webp?itok=968eVBNC/sites/default/files/styles/16_9_sm... https://cepr.org/sites/default/files/styles/16_9_small/public/2026-02/Untitled-2%20%281%29.webp?itok=968eVBNC — 200 — 29.3 KiB — 69 ms — h3https://cepr.org/sites/default/files/styles/16_9_small/public/2026-02/Untitled-6%20%281%29.webp?itok=Fi4XhppH/sites/default/files/styles/16_9_sm... https://cepr.org/sites/default/files/styles/16_9_small/public/2026-02/Untitled-6%20%281%29.webp?itok=Fi4XhppH — 200 — 25.7 KiB — 69 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... 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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
42% of JavaScript execution is third-party
First-party Third-party 1401ms · 291KB · €15/mo
Google Tag Manager
Tag Manager
Costly
Execution 559ms
Transfer 153 KB
Unused 42%
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 519ms
Transfer 0 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 323ms
Transfer 138 KB
Unused 51%
Monthly Cost €4/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 559ms and costs ~€6/month
  • Unattributable adds 519ms and costs ~€6/month
  • Google Tag Manager adds 323ms and costs ~€4/month

42% 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

Google Tag Manager takes 559ms 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 519ms 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 323ms 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

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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