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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
85
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.

11.79 s

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

18.05 s

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

605 ms

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

0.000

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

11.79 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.

18.30 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 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.3 MB transferred, 64 requests
FIX
4.3 MB transferred, 64 requests
Critical::
Page weighs 9.1 MB (4.3 MB transferred)
Warning::
Images are 2.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.1 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 782 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 782 KB
Info::
CSS is 235 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 235 KB
Info::
64 HTTP requests
Info::
Estimated 0.89 g CO2 per page load
4.3 MB / 2.4 MB budget
4.3 MB transferred
64 requests
0.89 g CO2 per page load
Images 2.1 MiB 51%
JavaScript 1.1 MiB 25%
Fonts 781.7 KiB 18%
CSS 234.8 KiB 5%
HTML 36.9 KiB 1%
Other 3.8 KiB 0%
Other 2.9 KiB 0%
Other 1.9 KiB 0%
Other 0 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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (4.3 MiB of 4.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3246ms total JS execution
FIX
3246ms total JS execution
Warning::
https://assetsnffrgf-a.akamaihd.net/assets/ct/8495...: 1252ms CPU time
Warning::
https://b.jw-cdn.org/code/media-player/v3.3.0/js/m...: 650ms CPU time
Warning::
Unattributable: 514ms CPU time
Info::
https://assetsnffrgf-a.akamaihd.net/assets/ct/8495...: 239ms CPU time
Info::
https://assetsnffrgf-a.akamaihd.net/assets/ct/8495...: 213ms CPU time
Warning::
Third-party scripts: 3246ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Style & Layout 22% Other 20% Script Parsing & Compilation 13% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/thirdparty.js1252ms421ms203ms3rd
https://b.jw-cdn.org/code/media-player/v3.3.0/js/media-player.min.js650ms498ms110ms3rd
Unattributable514ms7ms0ms3rd
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/all-videos.js239ms173ms61ms3rd
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/collector.css213ms0ms0ms3rd
https://www.jw.org/en/200ms11ms2ms3rd
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/cms.js111ms50ms27ms3rd
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/legal-notices-client.umd.js67ms58ms7ms3rd
F
JS Bundles
Action
9 scripts, 624 KB unused
FIX
9 scripts, 624 KB unused
Warning::
https://assetsnffrgf-a.akamaihd.net/assets/ct/8495...: 235 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://b.jw-cdn.org/code/media-player/v3.3.0/js/m...: 207 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assetsnffrgf-a.akamaihd.net/assets/ct/8495...: 121 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assetsnffrgf-a.akamaihd.net/assets/ct/8495...: 61 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 624 KB
624 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/thirdparty.js491 KB235 KB (48%)✓3rd
https://b.jw-cdn.org/code/media-player/v3.3.0/js/media-player.min.js280 KB207 KB (74%)✓3rd
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/all-videos.js188 KB121 KB (64%)✓3rd
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/cms.js81 KB61 KB (76%)✓3rd
https://www.jw.org/en/i18n.js?v=25528284003 KB—✓3rd
https://www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=12 KB—✓3rd
https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/legal-notices-client.umd.js21 KB—✓3rd
https://www.gstatic.com/cast/sdk/libs/sender/1.0/cast_framework.js12 KB—✓3rd
https://www.gstatic.com/eureka/clank/146/cast_sender.js13 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

F
Page Weight Inventory
Action
64 resources · 4.3 MB · 624 KB savings available
FIX
64 resources · 4.3 MB · 624 KB savings available
Warning::
Page weight 3.3 MB over 1MB target
Got: 4.3 MB Expected: ≤ 1 MB
Info::
~624 KB of savings available
Warning::
63 third-party resources (100% of weight)
Info::
6 resources over 200KB
64 resources · 4.3 MiB · 63 third-party 3.3 MiB over 1MB target
Image 51% · 2.2 MiB
JavaScript 25% · 1.1 MiB
Font 18% · 781.7 KiB
CSS 5% · 234.8 KiB
Document 1% · 37.5 KiB
Other 0% · 5.3 KiB

~623.5 KiB of savings available

Remove unused JavaScript: 623.5 KiB
C
Image Optimization
Action
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
Warning::
https://cms-imgp.jw-cdn.org/img/p/1102017423/univ/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assetsnffrgf-a.akamaihd.net/assets/ct/8495... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/502014311/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/500700101/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/502015134/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/1011722/univ/art... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/500900024/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/502014315/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/502000403/univ/w... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/1011229/univ/art... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/501100049/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/1001070103/univ/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/502012232/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/502019545/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cms-imgp.jw-cdn.org/img/p/502200120/univ/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 2.1 MB
0 oversized -0 KB
36 legacy format
15 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

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

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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 (782 KB)
PASS
4 fonts (782 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

782 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 12.0 s 14.0 s 16.0 s 18.0 s FCP 11.8 s LCP 18.1 shttps://b.jw-cdn.org/fonts/noto-sans/2.015/hinted/NotoSans-Regular.woff2NotoSans-Regular.woff2 https://b.jw-cdn.org/fonts/noto-sans/2.015/hinted/NotoSans-Regular.woff2 — 209.2 KiB — 35 ms — font-display: swaphttps://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/fonts/jw-icons-all-81d446b.woffjw-icons-all-81d446b.woff https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/fonts/jw-icons-all-81d446b.woff — 145.5 KiB — 31 ms — font-display: swaphttps://b.jw-cdn.org/fonts/noto-sans/2.015/hinted/NotoSans-Bold.woff2NotoSans-Bold.woff2 https://b.jw-cdn.org/fonts/noto-sans/2.015/hinted/NotoSans-Bold.woff2 — 213.7 KiB — 46 ms — font-display: swaphttps://b.jw-cdn.org/fonts/noto-sans/2.015/hinted/NotoSans-Italic.woff2NotoSans-Italic.woff2 https://b.jw-cdn.org/fonts/noto-sans/2.015/hinted/NotoSans-Italic.woff2 — 213.4 KiB — 52 ms — font-display: swap
NotoSans-Regular.woff2 woff2 swap
Size 209 KB
Load time 35 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
jw-icons-all-81d446b.woff woff swap
Size 145 KB
Load time 31 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
NotoSans-Bold.woff2 woff2 swap
Size 214 KB
Load time 46 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
NotoSans-Italic.woff2 woff2 swap
Size 213 KB
Load time 52 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~435 KB and ~870 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
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
64 requests over 1507ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s FCP 11.8 s LCP 18.1 shttps://jw.org// https://jw.org/ — 301 — 439 B — 18 ms — http/1.1https://www.jw.org/www.jw.org/ https://www.jw.org/ — 301 — 534 B — 36 ms — h2https://www.jw.org/en/www.jw.org/en/ https://www.jw.org/en/ — 200 — 36.9 KiB — 13 ms — h2https://www.jw.org/en/i18n.js?v=2552828400www.jw.org/en/i18n.js?v=2552828400 https://www.jw.org/en/i18n.js?v=2552828400 — 200 — 2.8 KiB — 11 ms — h2https://b.jw-cdn.org/code/media-player/v3.3.0/css/media-player.cssb.jw-cdn.org/code/media-player/v3.3... https://b.jw-cdn.org/code/media-player/v3.3.0/css/media-player.css — 200 — 10.2 KiB — 32 ms — h2https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/collector.cssassetsnffrgf-a.akamaihd.net/assets/... https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/collector.css — 200 — 224.6 KiB — 580 ms — http/1.1https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/images/siteLogo-jworg-print.pngassetsnffrgf-a.akamaihd.net/assets/... https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/images/siteLogo-jworg-print.png — 200 — 2.9 KiB — 53 ms — http/1.1https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/images/siteLogo-jworg-print-rtl.pngassetsnffrgf-a.akamaihd.net/assets/... https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/images/siteLogo-jworg-print-rtl.png — 200 — 4.8 KiB — 51 ms — http/1.1https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/images/home-bottom.jpgassetsnffrgf-a.akamaihd.net/assets/... https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/images/home-bottom.jpg — 200 — 192.7 KiB — 60 ms — http/1.1https://b.jw-cdn.org/code/media-player/v3.3.0/js/media-player.min.jsb.jw-cdn.org/code/media-player/v3.3... https://b.jw-cdn.org/code/media-player/v3.3.0/js/media-player.min.js — 200 — 280.4 KiB — 37 ms — h2https://www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=1www.gstatic.com/cv/js/sender/v1/cas... https://www.gstatic.com/cv/js/sender/v1/cast_sender.js?loadCastFramework=1 — 200 — 2.5 KiB — 59 ms — h2https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/thirdparty.jsassetsnffrgf-a.akamaihd.net/assets/... https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/thirdparty.js — 200 — 491.0 KiB — 425 ms — http/1.1https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/legal-notices-client.umd.jsassetsnffrgf-a.akamaihd.net/assets/... https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/legal-notices-client.umd.js — 200 — 21.1 KiB — 195 ms — http/1.1https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/cms.jsassetsnffrgf-a.akamaihd.net/assets/... https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/cms.js — 200 — 80.7 KiB — 75 ms — http/1.1https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/all-videos.jsassetsnffrgf-a.akamaihd.net/assets/... 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https://b.jw-cdn.org/apis/insight/events — 200 — 0 B — 103 ms — h2https://b.jw-cdn.org/apis/insight/eventsb.jw-cdn.org/apis/insight/events https://b.jw-cdn.org/apis/insight/events — 200 — 0 B — 104 ms — h2https://b.jw-cdn.org/apis/alerts/list?type=news&lang=E&limit=1&context=homePageb.jw-cdn.org/apis/alerts/list?type=... https://b.jw-cdn.org/apis/alerts/list?type=news&lang=E&limit=1&context=homePage — 200 — 0 B — 7 ms — h2https://b.jw-cdn.org/apis/alerts/list?type=news&lang=E&limit=1&context=homePageb.jw-cdn.org/apis/alerts/list?type=... https://b.jw-cdn.org/apis/alerts/list?type=news&lang=E&limit=1&context=homePage — 200 — 580 B — 9 ms — h2https://b.jw-cdn.org/apis/insight/eventsb.jw-cdn.org/apis/insight/events https://b.jw-cdn.org/apis/insight/events — 200 — 544 B — 83 ms — h2https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/images/icon_favicon.gifassetsnffrgf-a.akamaihd.net/assets/... https://assetsnffrgf-a.akamaihd.net/assets/ct/84959f7e17/images/icon_favicon.gif — 200 — 1.6 KiB — 25 ms — http/1.1https://b.jw-cdn.org/apis/insight/eventsb.jw-cdn.org/apis/insight/events https://b.jw-cdn.org/apis/insight/events — 200 — 543 B — 81 ms — h2https://www.jw.org/favicon.icowww.jw.org/favicon.ico https://www.jw.org/favicon.ico — 200 — 1.3 KiB — 11 ms — h2
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 3246ms · 1323KB · $43/mo
assetsnffrgf-a.akamaihd.net
Other
Costly
Execution 1252ms
Transfer 491 KB
Unused 48%
Monthly Cost $17/mo
b.jw-cdn.org
Other
Costly
Execution 650ms
Transfer 280 KB
Unused 74%
Monthly Cost $9/mo
Unattributable
Other
Costly
Execution 514ms
Transfer 0 KB
Monthly Cost $7/mo
assetsnffrgf-a.akamaihd.net
Other
Costly
Execution 239ms
Transfer 188 KB
Unused 64%
Monthly Cost $3/mo
assetsnffrgf-a.akamaihd.net
Other
Costly
Execution 213ms
Transfer 225 KB
Monthly Cost $3/mo
www.jw.org
Other
Optional
Execution 200ms
Transfer 37 KB
Monthly Cost $3/mo
assetsnffrgf-a.akamaihd.net
Other
Optional
Execution 111ms
Transfer 81 KB
Unused 76%
Monthly Cost $1/mo
assetsnffrgf-a.akamaihd.net
Other
Optional
Execution 67ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • assetsnffrgf-a.akamaihd.net adds 1252ms and costs ~$17/month
  • b.jw-cdn.org adds 650ms and costs ~$9/month
  • Unattributable adds 514ms and costs ~$7/month
  • assetsnffrgf-a.akamaihd.net adds 239ms and costs ~$3/month
  • assetsnffrgf-a.akamaihd.net adds 213ms and costs ~$3/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.

Learn more ▾

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

assetsnffrgf-a.akamaihd.net takes 1252ms 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

b.jw-cdn.org takes 650ms 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

74% of b.jw-cdn.org'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

Unattributable takes 514ms 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

assetsnffrgf-a.akamaihd.net takes 239ms 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

64% of assetsnffrgf-a.akamaihd.net'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

assetsnffrgf-a.akamaihd.net takes 213ms 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

76% of assetsnffrgf-a.akamaihd.net'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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