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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
25
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

2.86 s

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

4.60 s

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

255 ms

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

1.544

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

3.59 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.

5.56 s

Page Load Progression

426 ms
851 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
15
5 PASS 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 132 requests
FIX
2.2 MB transferred, 132 requests
Info::
Page weighs 6.4 MB (2.2 MB transferred)
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
Warning::
132 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
132 requests
0.46 g CO2 per page load
JavaScript 1.1 MiB 49%
Images 574.9 KiB 26%
Other 364.8 KiB 16%
Fonts 57.3 KiB 3%
CSS 56.1 KiB 3%
HTML 38.6 KiB 2%
Other 37.3 KiB 2%
Other 2.2 KiB 0%
Other 346 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
30 scripts, 435 KB unused
FIX
30 scripts, 435 KB unused
Warning::
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketc...: 156 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 131 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QCNN...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TWT...: 55 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.pbs.org/_next/static/chunks/0s2nm2ovzd...: 24 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 435 KB
435 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js257 KB156 KB (61%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964188 KB131 KB (70%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-QCNNW9XL0J&l=GTMDataLayer&cx=c&gtm=4e64h1171 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayer153 KB55 KB (36%)✓3rd
https://www.pbs.org/_next/static/chunks/0s2nm2ovzd~eb.js71 KB24 KB (34%)✓3rd
https://www.pbs.org/_next/static/chunks/0xah7ljry8-vn.js4 KB—✓3rd
https://www.pbs.org/_next/static/chunks/0a90q7a4u.lxa.js6 KB—✓3rd
https://www.pbs.org/_next/static/chunks/0nprg_.s4luox.js2 KB—✓3rd
https://www.pbs.org/_next/static/chunks/0o2fkeykpb~_~.js13 KB—✓3rd
https://www.pbs.org/_next/static/chunks/071at27ynygse.js8 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

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
132 resources · 2.2 MB · 435 KB savings available
FIX
132 resources · 2.2 MB · 435 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~435 KB of savings available
Warning::
131 third-party resources (100% of weight)
Info::
1 resources over 200KB
132 resources · 2.2 MiB · 131 third-party 1.2 MiB over 1MB target
JavaScript 49% · 1.1 MiB
Image 26% · 589.1 KiB
Document 14% · 312.3 KiB
Other 5% · 116.7 KiB
Font 3% · 57.3 KiB
CSS 3% · 56.1 KiB

~434.7 KiB of savings available

Remove unused JavaScript: 434.7 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.

B
Image Optimization
39 images, 0 KB saveable
REVIEW
39 images, 0 KB saveable
Info::
All images are well-optimized
39 images 575 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1760ms total JS execution
REVIEW
1760ms total JS execution
Warning::
https://www.pbs.org/_next/static/chunks/0s2nm2ovzd...: 513ms CPU time
Warning::
Unattributable: 379ms CPU time
Info::
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketc...: 202ms CPU time
Info::
https://www.pbs.org/: 161ms CPU time
Info::
https://securepubads.g.doubleclick.net/pagead/mana...: 126ms CPU time
Warning::
Third-party scripts: 1760ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 20% Style & Layout 11% Script Parsing & Compilation 11%
ScriptTotalScriptingParse/CompileParty
https://www.pbs.org/_next/static/chunks/0s2nm2ovzd~eb.js513ms350ms13ms3rd
Unattributable379ms66ms0ms3rd
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js202ms123ms79ms3rd
https://www.pbs.org/161ms12ms10ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964126ms68ms33ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayer123ms96ms25ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QCNNW9XL0J&l=GTMDataLayer&cx=c&gtm=4e64h1116ms96ms20ms3rd
https://www.pbs.org/_next/static/chunks/01-omjevdmk4c.js88ms69ms5ms3rd
https://www.pbs.org/_next/static/chunks/turbopack-09c8g3scji2i~.js52ms52ms1ms3rd
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 (57 KB)
PASS
2 fonts (57 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

57 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 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.9 s LCP 4.6 shttps://www-tc.pbs.org/pbsfonts/v1.2/PBSSans.woff2PBSSans.woff2 https://www-tc.pbs.org/pbsfonts/v1.2/PBSSans.woff2 — 28.9 KiB — 528 ms — font-display: swaphttps://www-tc.pbs.org/pbsfonts/v1.2/PBSSans-Bold.woff2PBSSans-Bold.woff2 https://www-tc.pbs.org/pbsfonts/v1.2/PBSSans-Bold.woff2 — 28.4 KiB — 670 ms — font-display: swap
PBSSans.woff2 woff2 swap
Size 29 KB
Load time 528 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
PBSSans-Bold.woff2 woff2 swap
Size 28 KB
Load time 670 ms
Start 2.1 s
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
Network Waterfall
132 requests over 8948ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.9 s LCP 4.6 shttps://pbs.org// https://pbs.org/ — 301 — 133 B — 748 ms — h2https://www.pbs.org/www.pbs.org/ https://www.pbs.org/ — 200 — 38.3 KiB — 1.0 s — h2https://www.pbs.org/_next/static/chunks/0f3_~aw_l8mhy.csswww.pbs.org/_next/static/chunks/0f3... https://www.pbs.org/_next/static/chunks/0f3_~aw_l8mhy.css — 200 — 13.7 KiB — 333 ms — h2https://www.pbs.org/_next/static/chunks/0brysxoqq8n3i.csswww.pbs.org/_next/static/chunks/0br... https://www.pbs.org/_next/static/chunks/0brysxoqq8n3i.css — 200 — 12.8 KiB — 282 ms — h2https://www.pbs.org/_next/static/chunks/10~_kl_qyhro1.csswww.pbs.org/_next/static/chunks/10~... https://www.pbs.org/_next/static/chunks/10~_kl_qyhro1.css — 200 — 4.6 KiB — 229 ms — h2https://www.pbs.org/_next/static/chunks/0hl59ti7b81wd.csswww.pbs.org/_next/static/chunks/0hl... https://www.pbs.org/_next/static/chunks/0hl59ti7b81wd.css — 200 — 13.0 KiB — 300 ms — h2https://www.pbs.org/_next/static/chunks/03vgigw2wfui4.csswww.pbs.org/_next/static/chunks/03v... https://www.pbs.org/_next/static/chunks/03vgigw2wfui4.css — 200 — 2.5 KiB — 256 ms — h2https://www.pbs.org/_next/static/chunks/0~6pxsp_g~sil.csswww.pbs.org/_next/static/chunks/0~6... https://www.pbs.org/_next/static/chunks/0~6pxsp_g~sil.css — 200 — 8.3 KiB — 245 ms — h2https://www.pbs.org/_next/static/chunks/16eo0~s20oeqe.csswww.pbs.org/_next/static/chunks/16e... https://www.pbs.org/_next/static/chunks/16eo0~s20oeqe.css — 200 — 1.2 KiB — 303 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayerwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayer — 200 — 152.5 KiB — 39 ms — h2https://www.pbs.org/_next/static/chunks/0p9sz6y_ryf72.jswww.pbs.org/_next/static/chunks/0p9... https://www.pbs.org/_next/static/chunks/0p9sz6y_ryf72.js — 200 — 3.0 KiB — 327 ms — h2https://www.pbs.org/_next/static/chunks/0z.04k0llpgr3.jswww.pbs.org/_next/static/chunks/0z.... https://www.pbs.org/_next/static/chunks/0z.04k0llpgr3.js — 200 — 9.5 KiB — 390 ms — h2https://www.pbs.org/_next/static/chunks/0s2nm2ovzd~eb.jswww.pbs.org/_next/static/chunks/0s2... https://www.pbs.org/_next/static/chunks/0s2nm2ovzd~eb.js — 200 — 70.7 KiB — 586 ms — h2https://www.pbs.org/_next/static/chunks/01-omjevdmk4c.jswww.pbs.org/_next/static/chunks/01-... https://www.pbs.org/_next/static/chunks/01-omjevdmk4c.js — 200 — 37.6 KiB — 482 ms — h2https://www.pbs.org/_next/static/chunks/15s7cb.wuhbap.jswww.pbs.org/_next/static/chunks/15s... https://www.pbs.org/_next/static/chunks/15s7cb.wuhbap.js — 200 — 9.9 KiB — 594 ms — h2https://www.pbs.org/_next/static/chunks/turbopack-09c8g3scji2i~.jswww.pbs.org/_next/static/chunks/tur... https://www.pbs.org/_next/static/chunks/turbopack-09c8g3scji2i~.js — 200 — 4.8 KiB — 607 ms — h2https://www.pbs.org/_next/static/chunks/0nprg_.s4luox.jswww.pbs.org/_next/static/chunks/0np... https://www.pbs.org/_next/static/chunks/0nprg_.s4luox.js — 200 — 2.1 KiB — 609 ms — h2https://www.pbs.org/_next/static/chunks/0o2fkeykpb~_~.jswww.pbs.org/_next/static/chunks/0o2... https://www.pbs.org/_next/static/chunks/0o2fkeykpb~_~.js — 200 — 13.5 KiB — 673 ms — h2https://www.pbs.org/_next/static/chunks/071at27ynygse.jswww.pbs.org/_next/static/chunks/071... https://www.pbs.org/_next/static/chunks/071at27ynygse.js — 200 — 7.8 KiB — 598 ms — h2https://www.pbs.org/_next/static/chunks/0i~rvun7q~qqg.jswww.pbs.org/_next/static/chunks/0i~... https://www.pbs.org/_next/static/chunks/0i~rvun7q~qqg.js — 200 — 11.1 KiB — 685 ms — h2https://www.pbs.org/_next/static/chunks/14.~85y_5m6fm.jswww.pbs.org/_next/static/chunks/14.... https://www.pbs.org/_next/static/chunks/14.~85y_5m6fm.js — 200 — 8.3 KiB — 652 ms — h2https://www.pbs.org/_next/static/chunks/161x_6-equb._.jswww.pbs.org/_next/static/chunks/161... https://www.pbs.org/_next/static/chunks/161x_6-equb._.js — 200 — 24.1 KiB — 740 ms — h2https://www.pbs.org/_next/static/chunks/069r2h5o0.vc8.jswww.pbs.org/_next/static/chunks/069... https://www.pbs.org/_next/static/chunks/069r2h5o0.vc8.js — 200 — 14.1 KiB — 700 ms — h2https://www.pbs.org/_next/static/chunks/0xah7ljry8-vn.jswww.pbs.org/_next/static/chunks/0xa... https://www.pbs.org/_next/static/chunks/0xah7ljry8-vn.js — 200 — 4.0 KiB — 613 ms — h2https://www.pbs.org/_next/static/chunks/0t0t01ar-skst.jswww.pbs.org/_next/static/chunks/0t0... https://www.pbs.org/_next/static/chunks/0t0t01ar-skst.js — 200 — 20.4 KiB — 631 ms — h2https://www.pbs.org/_next/static/chunks/044p6v6o.ot5x.jswww.pbs.org/_next/static/chunks/044... https://www.pbs.org/_next/static/chunks/044p6v6o.ot5x.js — 200 — 8.9 KiB — 640 ms — h2https://www.pbs.org/_next/static/chunks/0qkammi4ak1ns.jswww.pbs.org/_next/static/chunks/0qk... https://www.pbs.org/_next/static/chunks/0qkammi4ak1ns.js — 200 — 10.9 KiB — 688 ms — h2https://www.pbs.org/_next/static/chunks/0a90q7a4u.lxa.jswww.pbs.org/_next/static/chunks/0a9... https://www.pbs.org/_next/static/chunks/0a90q7a4u.lxa.js — 200 — 6.2 KiB — 660 ms — h2https://www.pbs.org/_next/static/chunks/0en21d_uiy3kj.jswww.pbs.org/_next/static/chunks/0en... https://www.pbs.org/_next/static/chunks/0en21d_uiy3kj.js — 200 — 17.8 KiB — 723 ms — h2https://www.pbs.org/_next/static/chunks/15hd~r6kfl8~2.jswww.pbs.org/_next/static/chunks/15h... https://www.pbs.org/_next/static/chunks/15hd~r6kfl8~2.js — 200 — 16.5 KiB — 749 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.9 s LCP 4.6 shttps://pbs.org// https://pbs.org/ — 301 — 133 B — 748 ms — h2https://www.pbs.org/www.pbs.org/ https://www.pbs.org/ — 200 — 38.3 KiB — 1.0 s — h2https://www.pbs.org/_next/static/chunks/0f3_~aw_l8mhy.csswww.pbs.org/_next/static/chunks/0f3... https://www.pbs.org/_next/static/chunks/0f3_~aw_l8mhy.css — 200 — 13.7 KiB — 333 ms — h2https://www.pbs.org/_next/static/chunks/0brysxoqq8n3i.csswww.pbs.org/_next/static/chunks/0br... https://www.pbs.org/_next/static/chunks/0brysxoqq8n3i.css — 200 — 12.8 KiB — 282 ms — h2https://www.pbs.org/_next/static/chunks/10~_kl_qyhro1.csswww.pbs.org/_next/static/chunks/10~... https://www.pbs.org/_next/static/chunks/10~_kl_qyhro1.css — 200 — 4.6 KiB — 229 ms — h2https://www.pbs.org/_next/static/chunks/0hl59ti7b81wd.csswww.pbs.org/_next/static/chunks/0hl... https://www.pbs.org/_next/static/chunks/0hl59ti7b81wd.css — 200 — 13.0 KiB — 300 ms — h2https://www.pbs.org/_next/static/chunks/03vgigw2wfui4.csswww.pbs.org/_next/static/chunks/03v... https://www.pbs.org/_next/static/chunks/03vgigw2wfui4.css — 200 — 2.5 KiB — 256 ms — h2https://www.pbs.org/_next/static/chunks/0~6pxsp_g~sil.csswww.pbs.org/_next/static/chunks/0~6... https://www.pbs.org/_next/static/chunks/0~6pxsp_g~sil.css — 200 — 8.3 KiB — 245 ms — h2https://www.pbs.org/_next/static/chunks/16eo0~s20oeqe.csswww.pbs.org/_next/static/chunks/16e... https://www.pbs.org/_next/static/chunks/16eo0~s20oeqe.css — 200 — 1.2 KiB — 303 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayerwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayer — 200 — 152.5 KiB — 39 ms — h2https://www.pbs.org/_next/static/chunks/0p9sz6y_ryf72.jswww.pbs.org/_next/static/chunks/0p9... https://www.pbs.org/_next/static/chunks/0p9sz6y_ryf72.js — 200 — 3.0 KiB — 327 ms — 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https://www.google-analytics.com/g/collect?v=2&tid=G-QCNNW9XL0J&gtm=45je64h1v896547955z86416832za20gzb6416832zd6416832&_p=1776797015619&gcd=13l3l3l3l1l1&npa=0&dma=0&_prs=gs&are=1&cid=421890623.1776797016&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266400~117884344&sid=1776797016&sct=1&seg=0&dl=https%3A%2F%2Fwww.pbs.org%2F&dt=PBS%3A%20Public%20Broadcasting%20Service&en=page_view&_fv=1&_nsi=1&_ss=2&ep.hostname=www.pbs.org&ep.pbs_platform=GA%20Web%20GTM&ep.gtm_settings=GTM-TWTDGH%20%7C%20698&ep.gtm_tag_name=GA4%20-%20PBS%20-%20Configuration%20Tag&tfd=3340 — 204 — 547 B — 32 ms — h2https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.jscdn.ketchjs.com/ketchtag/stable/v2.... https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js — 200 — 257.5 KiB — 860 ms — h2https://www.pbs.org/show/frontline/?_rsc=1r34mwww.pbs.org/show/frontline/?_rsc=1r... https://www.pbs.org/show/frontline/?_rsc=1r34m — 200 — 1.9 KiB — 647 ms — h2https://www.pbs.org/show/finding-your-roots/?_rsc=1r34mwww.pbs.org/show/finding-your-roots... https://www.pbs.org/show/finding-your-roots/?_rsc=1r34m — 200 — 1.9 KiB — 666 ms — h2https://www.pbs.org/show/newshour/?_rsc=1r34mwww.pbs.org/show/newshour/?_rsc=1r3... https://www.pbs.org/show/newshour/?_rsc=1r34m — 200 — 1.9 KiB — 650 ms — h2https://www.pbs.org/newshour/world/hungarys-magyar-wants-to-take-over-as-prime-minister-as-early-as-may-5?_rsc=1r34mwww.pbs.org/newshour/world/hungarys... https://www.pbs.org/newshour/world/hungarys-magyar-wants-to-take-over-as-prime-minister-as-early-as-may-5?_rsc=1r34m — 200 — 89.8 KiB — 674 ms — h2https://www.pbs.org/newshour/show/mideast-experts-discuss-how-the-u-s-blockade-could-pressure-the-iranian-regime?_rsc=1r34mwww.pbs.org/newshour/show/mideast-e... https://www.pbs.org/newshour/show/mideast-experts-discuss-how-the-u-s-blockade-could-pressure-the-iranian-regime?_rsc=1r34m — 200 — 95.9 KiB — 768 ms — h2https://www.pbs.org/newshour/economy/filling-out-your-state-tax-return-what-to-know-about-trumps-tax-breaks-for-tips-and-overtime?_rsc=1r34mwww.pbs.org/newshour/economy/fillin... https://www.pbs.org/newshour/economy/filling-out-your-state-tax-return-what-to-know-about-trumps-tax-breaks-for-tips-and-overtime?_rsc=1r34m — 200 — 87.9 KiB — 712 ms — h2https://www.pbs.org/explore/henry-louis-gates-jr/?_rsc=1r34mwww.pbs.org/explore/henry-louis-gat... https://www.pbs.org/explore/henry-louis-gates-jr/?_rsc=1r34m — 200 — 1.9 KiB — 399 ms — h2https://www.pbs.org/explore/home-and-how-to/?_rsc=1r34mwww.pbs.org/explore/home-and-how-to... https://www.pbs.org/explore/home-and-how-to/?_rsc=1r34m — 200 — 1.9 KiB — 401 ms — h2https://global.ketchcdn.com/web/v3/ipglobal.ketchcdn.com/web/v3/ip https://global.ketchcdn.com/web/v3/ip — 200 — 423 B — 326 ms — h3https://www.pbs.org/favicons/favicon.svgwww.pbs.org/favicons/favicon.svg https://www.pbs.org/favicons/favicon.svg — 200 — 2.4 KiB — 448 ms — h2https://www.pbs.org/favicons/favicon-192x192.pngwww.pbs.org/favicons/favicon-192x19... https://www.pbs.org/favicons/favicon-192x192.png — 200 — 11.8 KiB — 451 ms — h2https://www.pbs.org/explore/culture/?_rsc=1r34mwww.pbs.org/explore/culture/?_rsc=1... https://www.pbs.org/explore/culture/?_rsc=1r34m — 200 — 1.9 KiB — 573 ms — h2https://www.pbs.org/explore/food/?_rsc=1r34mwww.pbs.org/explore/food/?_rsc=1r34... https://www.pbs.org/explore/food/?_rsc=1r34m — 200 — 1.9 KiB — 577 ms — h2https://www.pbs.org/explore/arts/?_rsc=1r34mwww.pbs.org/explore/arts/?_rsc=1r34... https://www.pbs.org/explore/arts/?_rsc=1r34m — 200 — 1.9 KiB — 538 ms — h2https://www.pbs.org/explore/science-and-nature/?_rsc=1r34mwww.pbs.org/explore/science-and-nat... https://www.pbs.org/explore/science-and-nature/?_rsc=1r34m — 200 — 1.9 KiB — 516 ms — h2https://global.ketchcdn.com/web/v3/config/pbs/website_smart_tag/production/default/en/config.json?hash=6248610849891238073global.ketchcdn.com/web/v3/config/p... https://global.ketchcdn.com/web/v3/config/pbs/website_smart_tag/production/default/en/config.json?hash=6248610849891238073 — 200 — 13.3 KiB — 168 ms — h3https://global.ketchcdn.com/web/v2/log?hasConsent=false&url=https%3A%2F%2Fwww.pbs.org%2F&property=website_smart_tag&environment=production&jurisdiction=default&tenant=pbs&dver=1761066702&event_type=once_identities&ids=eyJzd2Jfd2Vic2l0ZV9zbWFydF90YWciOiJlZTgzZjZhNy1hZjI4LTRhZDItODIxOS0xZGY4MmNlZDU0NWQifQ%3D%3D&region=SGglobal.ketchcdn.com/web/v2/log?hasC... https://global.ketchcdn.com/web/v2/log?hasConsent=false&url=https%3A%2F%2Fwww.pbs.org%2F&property=website_smart_tag&environment=production&jurisdiction=default&tenant=pbs&dver=1761066702&event_type=once_identities&ids=eyJzd2Jfd2Vic2l0ZV9zbWFydF90YWciOiJlZTgzZjZhNy1hZjI4LTRhZDItODIxOS0xZGY4MmNlZDU0NWQifQ%3D%3D&region=SG — 204 — 346 B — 318 ms — h3https://global.ketchcdn.com/web/v3/consent/pbs/getglobal.ketchcdn.com/web/v3/consent/... https://global.ketchcdn.com/web/v3/consent/pbs/get — 200 — 0 B — 177 ms — h3https://www.pbs.org/explore/news-and-public-affairs/?_rsc=1r34mwww.pbs.org/explore/news-and-public... https://www.pbs.org/explore/news-and-public-affairs/?_rsc=1r34m — 200 — 1.9 KiB — 385 ms — h2https://www.pbs.org/explore/history/?_rsc=1r34mwww.pbs.org/explore/history/?_rsc=1... https://www.pbs.org/explore/history/?_rsc=1r34m — 200 — 1.9 KiB — 392 ms — h2https://www.pbs.org/explore/documentaries-and-indie-films/?_rsc=1r34mwww.pbs.org/explore/documentaries-a... https://www.pbs.org/explore/documentaries-and-indie-films/?_rsc=1r34m — 200 — 1.9 KiB — 403 ms — h2https://global.ketchcdn.com/web/v3/consent/pbs/getglobal.ketchcdn.com/web/v3/consent/... https://global.ketchcdn.com/web/v3/consent/pbs/get — 200 — 568 B — 250 ms — h3https://www.pbs.org/explore/drama/?_rsc=1r34mwww.pbs.org/explore/drama/?_rsc=1r3... https://www.pbs.org/explore/drama/?_rsc=1r34m — 200 — 1.9 KiB — 405 ms — h2https://global.ketchcdn.com/web/v3/consent/pbs/updateglobal.ketchcdn.com/web/v3/consent/... https://global.ketchcdn.com/web/v3/consent/pbs/update — 200 — 0 B — 181 ms — h3https://www.pbs.org/show/independent-lens/?_rsc=p37crwww.pbs.org/show/independent-lens/?... https://www.pbs.org/show/independent-lens/?_rsc=p37cr — 200 — 2.2 KiB — 647 ms — h2https://www.pbs.org/show/austin-city-limits/?_rsc=p37crwww.pbs.org/show/austin-city-limits... https://www.pbs.org/show/austin-city-limits/?_rsc=p37cr — 200 — 2.2 KiB — 637 ms — h2https://www.pbs.org/show/nova/?_rsc=p37crwww.pbs.org/show/nova/?_rsc=p37cr https://www.pbs.org/show/nova/?_rsc=p37cr — 200 — 2.2 KiB — 689 ms — h2https://www.pbs.org/show/nature/?_rsc=p37crwww.pbs.org/show/nature/?_rsc=p37cr https://www.pbs.org/show/nature/?_rsc=p37cr — 200 — 2.6 KiB — 623 ms — h2https://global.ketchcdn.com/web/v3/consent/pbs/updateglobal.ketchcdn.com/web/v3/consent/... https://global.ketchcdn.com/web/v3/consent/pbs/update — 200 — 1018 B — 321 ms — h3https://www.pbs.org/show/frontline/?_rsc=p37crwww.pbs.org/show/frontline/?_rsc=p3... https://www.pbs.org/show/frontline/?_rsc=p37cr — 200 — 2.2 KiB — 650 ms — h2https://www.pbs.org/show/finding-your-roots/?_rsc=p37crwww.pbs.org/show/finding-your-roots... https://www.pbs.org/show/finding-your-roots/?_rsc=p37cr — 200 — 2.6 KiB — 626 ms — h2https://www.pbs.org/show/newshour/?_rsc=p37crwww.pbs.org/show/newshour/?_rsc=p37... https://www.pbs.org/show/newshour/?_rsc=p37cr — 200 — 2.6 KiB — 642 ms — h2https://www.pbs.org/explore/henry-louis-gates-jr/?_rsc=p37crwww.pbs.org/explore/henry-louis-gat... https://www.pbs.org/explore/henry-louis-gates-jr/?_rsc=p37cr — 200 — 2.2 KiB — 1.8 s — h2https://www.pbs.org/explore/home-and-how-to/?_rsc=p37crwww.pbs.org/explore/home-and-how-to... https://www.pbs.org/explore/home-and-how-to/?_rsc=p37cr — 200 — 2.2 KiB — 437 ms — h2https://www.pbs.org/explore/culture/?_rsc=p37crwww.pbs.org/explore/culture/?_rsc=p... https://www.pbs.org/explore/culture/?_rsc=p37cr — 200 — 2.2 KiB — 443 ms — h2https://www.pbs.org/explore/food/?_rsc=p37crwww.pbs.org/explore/food/?_rsc=p37c... https://www.pbs.org/explore/food/?_rsc=p37cr — 200 — 2.6 KiB — 384 ms — h2https://www.pbs.org/explore/arts/?_rsc=p37crwww.pbs.org/explore/arts/?_rsc=p37c... https://www.pbs.org/explore/arts/?_rsc=p37cr — 200 — 2.2 KiB — 409 ms — h2https://www.pbs.org/explore/science-and-nature/?_rsc=p37crwww.pbs.org/explore/science-and-nat... https://www.pbs.org/explore/science-and-nature/?_rsc=p37cr — 200 — 2.2 KiB — 402 ms — h2https://www.pbs.org/explore/news-and-public-affairs/?_rsc=p37crwww.pbs.org/explore/news-and-public... https://www.pbs.org/explore/news-and-public-affairs/?_rsc=p37cr — 200 — 2.2 KiB — 422 ms — h2https://www.pbs.org/explore/history/?_rsc=p37crwww.pbs.org/explore/history/?_rsc=p... https://www.pbs.org/explore/history/?_rsc=p37cr — 200 — 2.2 KiB — 415 ms — h2https://www.pbs.org/explore/documentaries-and-indie-films/?_rsc=p37crwww.pbs.org/explore/documentaries-a... https://www.pbs.org/explore/documentaries-and-indie-films/?_rsc=p37cr — 200 — 2.2 KiB — 1.1 s — h2https://www.pbs.org/explore/drama/?_rsc=p37crwww.pbs.org/explore/drama/?_rsc=p37... https://www.pbs.org/explore/drama/?_rsc=p37cr — 200 — 2.6 KiB — 390 ms — h2https://www.pbs.org/?_rsc=p37crwww.pbs.org/?_rsc=p37cr https://www.pbs.org/?_rsc=p37cr — 200 — 2.6 KiB — 402 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 1760ms · 920KB · €28/mo
www.pbs.org
Other
Costly
Execution 513ms
Transfer 71 KB
Unused 34%
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 379ms
Transfer 0 KB
Monthly Cost €6/mo
cdn.ketchjs.com
Other
Costly
Execution 202ms
Transfer 257 KB
Unused 61%
Monthly Cost €3/mo
www.pbs.org
Other
Optional
Execution 161ms
Transfer 38 KB
Monthly Cost €3/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 126ms
Transfer 188 KB
Unused 70%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 123ms
Transfer 153 KB
Unused 36%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 116ms
Transfer 171 KB
Unused 40%
Monthly Cost €2/mo
www.pbs.org
Other
Optional
Execution 88ms
Transfer 38 KB
Monthly Cost €1/mo
www.pbs.org
Other
Optional
Execution 52ms
Transfer 5 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.pbs.org adds 513ms and costs ~€8/month
  • Unattributable adds 379ms and costs ~€6/month
  • cdn.ketchjs.com adds 202ms 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

www.pbs.org takes 513ms 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 379ms 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

cdn.ketchjs.com takes 202ms 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

61% of cdn.ketchjs.com'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

70% of securepubads.g.doubleclick.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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