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https://castbox.fm

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
75
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.
69
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.

1.83 s

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

2.70 s

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

0 ms

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

0.057

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

1.95 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.

2.72 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
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
6.0 MB transferred, 52 requests
FIX
6.0 MB transferred, 52 requests
Critical::
Page weighs 7.3 MB (6.0 MB transferred)
Warning::
Images are 5.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.5 MB
Info::
52 HTTP requests
Info::
Estimated 1.3 g CO2 per page load
6.0 MB / 2.4 MB budget
6.0 MB transferred
52 requests
1.3 g CO2 per page load
Images 5.5 MiB 91%
JavaScript 365.4 KiB 6%
Fonts 101.2 KiB 2%
HTML 62.5 KiB 1%
Other 14.8 KiB 0%
CSS 10.9 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
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (6.0 MiB of 6.0 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
Page Weight Inventory
Action
52 resources · 6.0 MB · 135 KB savings available
FIX
52 resources · 6.0 MB · 135 KB savings available
Warning::
Page weight 5.0 MB over 1MB target
Got: 6.0 MB Expected: ≤ 1 MB
Info::
~135 KB of savings available
Warning::
50 third-party resources (99% of weight)
Info::
4 resources over 200KB
52 resources · 6.0 MiB · 50 third-party 5.0 MiB over 1MB target
Image 91% · 5.5 MiB
JavaScript 6% · 365.4 KiB
Font 2% · 101.2 KiB
Document 1% · 62.5 KiB
CSS 0% · 10.9 KiB
Other 0% · 1.7 KiB

~135.4 KiB of savings available

Remove unused JavaScript: 135.4 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/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/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/b1/fa/eb/b366f54de9b9511f8ff... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s3.castbox.fm/webstatic/images/logo.c20be2... 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 5.5 MB
0 oversized -0 KB
22 legacy format
5 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

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

B
JS Bundles
10 scripts, 135 KB unused
REVIEW
10 scripts, 135 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.app.6b57c5...: 26 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s3.castbox.fm/webstatic/js/page.m.app.inde...: 22 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s3.castbox.fm/webstatic/js/page.vendors~au...: 21 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 135 KB
135 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.app.6b57c572.js60 KB26 KB (43%)✓3rd
https://s3.castbox.fm/webstatic/js/page.m.app.index.83d7bb8a.js35 KB22 KB (63%)✓3rd
https://s3.castbox.fm/webstatic/js/page.vendors~audiobooks~audiobooks.genre~castbox.main~categories~ch~channellist~claim~claim.failed~claim.~b62a876c.b05dccc0.js28 KB21 KB (76%)✓3rd
https://s3.castbox.fm/webstatic/js/manifest.b09ba0be.js4 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.vendor.e44e040b.js50 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.categories~channellist~claim~claim.failed~claim.link_claimed~claim.link_lost~claim.ok~global~login~m~430f1dc9.c099faab.js5 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.m.app.main.74ac7064.js3 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.vendors~audiobooks~audiobooks.genre~categories~ch~channellist~claim~claim.failed~claim.link_claimed~~48565954.55d81d64.js9 KB—✓3rd
https://s3.castbox.fm/webstatic/js/page.vendors~audiobooks~ch~ep~global~home~login~m.about~m.app.index~m.contactus~m.cookie~m.download~m.hel~dc9febc7.d910713d.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+
JS Execution Cost
380ms total JS execution
PASS
380ms total JS execution
Info::
https://castbox.fm/: 154ms CPU time
Info::
Unattributable: 93ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CESP...: 71ms CPU time
Info::
https://s3.castbox.fm/webstatic/js/page.vendor.e44...: 62ms CPU time
Warning::
Third-party scripts: 226ms (59% of total)

Main Thread Breakdown

Other 40% Script Evaluation 34% Style & Layout 12% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://castbox.fm/154ms11ms13ms1st
Unattributable93ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CESP3QW02J71ms58ms12ms3rd
https://s3.castbox.fm/webstatic/js/page.vendor.e44e040b.js62ms56ms4ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.8 s LCP 2.7 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 — 88 ms — font-display: swap
lato_light.5b761f2d.ttf ttf swap
Size 52 KB
Load time 74 ms
Start 1.0 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 88 ms
Start 1.0 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
52 requests over 1659ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.8 s LCP 2.7 shttps://castbox.fm// https://castbox.fm/ — 200 — 62.5 KiB — 1.1 s — h2https://s3.castbox.fm/webstatic/css/m.app.main.f6fe6822.chunk.csss3.castbox.fm/webstatic/css/m.app.m... https://s3.castbox.fm/webstatic/css/m.app.main.f6fe6822.chunk.css — 200 — 3.9 KiB — 65 ms — h2https://s3.castbox.fm/webstatic/css/m.app.index.930bee52.chunk.csss3.castbox.fm/webstatic/css/m.app.i... https://s3.castbox.fm/webstatic/css/m.app.index.930bee52.chunk.css — 200 — 7.0 KiB — 66 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 — 68 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 — 101 ms — h2https://content.production.cdn.art19.com/images/af/18/5c/b3/af185cb3-802a-4ec4-a824-99b360a223cf/94167585895da9dc17dc03f0cd14de5c6d7782c097b0e23c1d105768d149d285d7232bbb322855195eab38ac32ee7e5df7e62dc8338e363cd0ca3de5619e3343.jpegcontent.production.cdn.art19.com/im... https://content.production.cdn.art19.com/images/af/18/5c/b3/af185cb3-802a-4ec4-a824-99b360a223cf/94167585895da9dc17dc03f0cd14de5c6d7782c097b0e23c1d105768d149d285d7232bbb322855195eab38ac32ee7e5df7e62dc8338e363cd0ca3de5619e3343.jpeg — 200 — 372.9 KiB — 114 ms — h2https://is1-ssl.mzstatic.com/image/thumb/Podcasts221/v4/ab/43/05/ab4305cd-5a37-a91a-5d77-6ddc34e404c5/mza_12314098621722452322.jpg/600x600bb.jpgis1-ssl.mzstatic.com/image/thumb/Po... https://is1-ssl.mzstatic.com/image/thumb/Podcasts221/v4/ab/43/05/ab4305cd-5a37-a91a-5d77-6ddc34e404c5/mza_12314098621722452322.jpg/600x600bb.jpg — 200 — 141.5 KiB — 77 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
59% of JavaScript execution is third-party
First-party Third-party 226ms · 214KB · $4/mo
Unattributable
Other
Optional
Execution 93ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 164 KB
Unused 41%
Monthly Cost $1/mo
s3.castbox.fm
Other
Optional
Execution 62ms
Transfer 50 KB
Monthly Cost $1/mo

59% 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

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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