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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
50
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
66
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.
77
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.

3.77 s

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

9.74 s

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

105 ms

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

0.273

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

4.61 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.

13.76 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
7 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.5 MB transferred, 52 requests
FIX
3.5 MB transferred, 52 requests
Warning::
Page weighs 4.8 MB (3.5 MB transferred)
Warning::
Images are 2.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.9 MB
Info::
52 HTTP requests
Info::
Estimated 0.73 g CO2 per page load
3.5 MB / 2.4 MB budget
3.5 MB transferred
52 requests
0.73 g CO2 per page load
Images 2.9 MiB 83%
JavaScript 393.6 KiB 11%
Fonts 101.2 KiB 3%
HTML 75.5 KiB 2%
CSS 17.0 KiB 0%
Other 14.8 KiB 0%
Other 1.2 KiB 0%
Other 545 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

D
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (3.4 MiB of 3.5 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
D
Page Weight Inventory
Action
52 resources · 3.5 MB · 149 KB savings available
FIX
52 resources · 3.5 MB · 149 KB savings available
Warning::
Page weight 2.5 MB over 1MB target
Got: 3.5 MB Expected: ≤ 1 MB
Info::
~149 KB of savings available
Warning::
50 third-party resources (98% of weight)
Info::
1 resources over 200KB
52 resources · 3.5 MiB · 50 third-party 2.5 MiB over 1MB target
Image 83% · 2.9 MiB
JavaScript 11% · 393.6 KiB
Font 3% · 101.2 KiB
Document 2% · 75.5 KiB
CSS 0% · 17.0 KiB
Other 0% · 1.7 KiB

~148.7 KiB of savings available

Remove unused JavaScript: 148.7 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
Image Optimization
Action
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://s3.castbox.fm/wp-content/uploads/2018/05/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s3.castbox.fm/webstatic/images/index_bg_ph... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s3.castbox.fm/8a/81/60/605a1c40698998c6ff2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s3.castbox.fm/fa/00/5a/19fd024f1fa0d92ce80... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 2.9 MB
0 oversized -0 KB
21 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1558ms total JS execution
REVIEW
1558ms total JS execution
Warning::
https://castbox.fm/: 737ms CPU time
Warning::
Unattributable: 333ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CESP...: 251ms CPU time
Info::
https://s3.castbox.fm/webstatic/js/page.vendor.623...: 237ms CPU time
Warning::
Third-party scripts: 821ms (53% of total)

Main Thread Breakdown

Other 46% Script Evaluation 29% Style & Layout 10% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://castbox.fm/737ms45ms36ms1st
Unattributable333ms8ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CESP3QW02J251ms204ms43ms3rd
https://s3.castbox.fm/webstatic/js/page.vendor.623842c7.js237ms205ms14ms3rd
B
JS Bundles
11 scripts, 149 KB unused
REVIEW
11 scripts, 149 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CESP...: 67 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s3.castbox.fm/webstatic/js/page.m.termsofs...: 40 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s3.castbox.fm/webstatic/js/page.vendors~m....: 21 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s3.castbox.fm/webstatic/js/page.app.623d31...: 21 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 149 KB
149 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CESP3QW02J164 KB67 KB (41%)✓3rd
https://s3.castbox.fm/webstatic/js/page.m.termsofservice.53ecfa4f.js40 KB40 KB (100%)✓3rd
https://s3.castbox.fm/webstatic/js/page.vendors~m.about~m.anchorClaim~m.app.index~m.app.main~m.audiobooks~m.audiobooks.genre~m.castbox.main~~13a5a53b.962ec40f.js29 KB21 KB (76%)✓3rd
https://s3.castbox.fm/webstatic/js/page.app.623d315c.js52 KB21 KB (40%)✓3rd
https://s3.castbox.fm/webstatic/js/manifest.0758fa54.js3 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.vendor.623842c7.js50 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.m.about~m.anchorClaim~m.app.index~m.app.main~m.audiobooks~m.audiobooks.genre~m.castbox.main~m.castbo~423f467e.214def8b.js6 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.m.app.main.754ce902.js2 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.vendors~m.about~m.anchorClaim~m.app.index~m.channellist~m.claim_failed~m.claim_ok~m.contactus~m.cook~bb098d8c.6d01b850.js8 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.vendors~m.about~m.app.index~m.contactus~m.cookie~m.download~m.global~m.help~m.ippolicy~m.join~m.live~e95b7141.b252ba80.js7 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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
2 fonts (101 KB)
PASS
2 fonts (101 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

101 KB total

Render-blocking

0

of 2

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 9.7 shttps://s3.castbox.fm/webstatic/fonts/lato_light.5b761f2d.ttflato_light.5b761f2d.ttf https://s3.castbox.fm/webstatic/fonts/lato_light.5b761f2d.ttf — 51.7 KiB — 74 ms — font-display: swaphttps://s3.castbox.fm/webstatic/fonts/lato_regular.7f690e50.ttflato_regular.7f690e50.ttf https://s3.castbox.fm/webstatic/fonts/lato_regular.7f690e50.ttf — 49.5 KiB — 89 ms — font-display: swap
lato_light.5b761f2d.ttf ttf swap
Size 52 KB
Load time 74 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
lato_regular.7f690e50.ttf ttf swap
Size 49 KB
Load time 89 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~30 KB and ~60 ms

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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
3
prefetch
—

3 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
Network Waterfall
52 requests over 1671ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.8 s LCP 9.7 shttps://castbox.fm// https://castbox.fm/ — 200 — 75.5 KiB — 1.2 s — h2https://s3.castbox.fm/webstatic/css/m.app.main.add32de5.chunk.csss3.castbox.fm/webstatic/css/m.app.m... https://s3.castbox.fm/webstatic/css/m.app.main.add32de5.chunk.css — 200 — 3.9 KiB — 121 ms — h2https://s3.castbox.fm/webstatic/css/m.termsofservice.cd916d0f.chunk.csss3.castbox.fm/webstatic/css/m.terms... https://s3.castbox.fm/webstatic/css/m.termsofservice.cd916d0f.chunk.css — 200 — 6.1 KiB — 121 ms — h2https://s3.castbox.fm/webstatic/css/m.app.index.9b883d70.chunk.csss3.castbox.fm/webstatic/css/m.app.i... https://s3.castbox.fm/webstatic/css/m.app.index.9b883d70.chunk.css — 200 — 7.0 KiB — 123 ms — h2https://s3.castbox.fm/wp-content/uploads/2018/05/castbox_logo-text.pngs3.castbox.fm/wp-content/uploads/20... https://s3.castbox.fm/wp-content/uploads/2018/05/castbox_logo-text.png — 200 — 11.4 KiB — 137 ms — h2https://s3.castbox.fm/webstatic/images/index_bg_phone.862bc5ea.pngs3.castbox.fm/webstatic/images/inde... https://s3.castbox.fm/webstatic/images/index_bg_phone.862bc5ea.png — 200 — 132.2 KiB — 159 ms — h2https://megaphone.imgix.net/podcasts/8e5bcebc-ca16-11ee-89f0-0fa0b9bdfc7c/image/11f568857987283428d892402e623b21.jpg?ixlib=rails-4.3.1&max-w=3000&max-h=3000&fit=crop&auto=format,compressmegaphone.imgix.net/podcasts/8e5bce... https://megaphone.imgix.net/podcasts/8e5bcebc-ca16-11ee-89f0-0fa0b9bdfc7c/image/11f568857987283428d892402e623b21.jpg?ixlib=rails-4.3.1&max-w=3000&max-h=3000&fit=crop&auto=format,compress — 200 — 160.4 KiB — 40 ms — h2https://is1-ssl.mzstatic.com/image/thumb/Podcasts221/v4/32/81/a3/3281a345-6fa5-1d0d-b0bc-f02b0850a0ae/mza_17562537467118278179.jpeg/600x600bb.jpgis1-ssl.mzstatic.com/image/thumb/Po... https://is1-ssl.mzstatic.com/image/thumb/Podcasts221/v4/32/81/a3/3281a345-6fa5-1d0d-b0bc-f02b0850a0ae/mza_17562537467118278179.jpeg/600x600bb.jpg — 200 — 53.5 KiB — 159 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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
53% of JavaScript execution is third-party
First-party Third-party 821ms · 214KB · $14/mo
Unattributable
Other
Costly
Execution 333ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 251ms
Transfer 164 KB
Unused 41%
Monthly Cost $4/mo
s3.castbox.fm
Other
Costly
Execution 237ms
Transfer 50 KB
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • Unattributable adds 333ms and costs ~$6/month
  • Google Tag Manager adds 251ms and costs ~$4/month
  • s3.castbox.fm adds 237ms and costs ~$4/month

53% 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

Unattributable takes 333ms 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 251ms 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

s3.castbox.fm takes 237ms 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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