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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

5
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.
73
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.

5.87 s

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

13.01 s

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

2.11 s

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

1.023

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

8.10 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.

16.53 s

Page Load Progression

436 ms
872 ms
1.3 s
1.7 s
2.2 s
2.6 s
3.0 s
3.5 s
Checks
17
7 PASS 2 REVIEW 6 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 131 requests
FIX
2.4 MB transferred, 131 requests
Info::
Page weighs 7.3 MB (2.4 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Warning::
131 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.50 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
131 requests
0.50 g CO2 per page load
JavaScript 1.2 MiB 49%
Images 557.9 KiB 23%
Other 480.7 KiB 20%
Fonts 57.4 KiB 2%
CSS 56.1 KiB 2%
HTML 47.9 KiB 2%
Other 37.3 KiB 2%
Other 13.2 KiB 1%
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 (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7236ms total JS execution
FIX
7236ms total JS execution
Warning::
https://www.pbs.org/_next/static/chunks/0s2nm2ovzd...: 2125ms CPU time
Warning::
Unattributable: 1101ms CPU time
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 800ms CPU time
Warning::
https://www.pbs.org/: 733ms CPU time
Warning::
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketc...: 653ms CPU time
Warning::
Third-party scripts: 7236ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 16% Style & Layout 16% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://www.pbs.org/_next/static/chunks/0s2nm2ovzd~eb.js2125ms1414ms33ms3rd
Unattributable1101ms124ms0ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604090101/pubads_impl.js?cb=31097905800ms517ms108ms3rd
https://www.pbs.org/733ms37ms29ms3rd
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js653ms437ms213ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayer426ms316ms78ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QCNNW9XL0J&l=GTMDataLayer&cx=c&gtm=4e64h1384ms309ms69ms3rd
https://www.pbs.org/_next/static/chunks/01-omjevdmk4c.js352ms303ms20ms3rd
https://pagead2.googlesyndication.com/pagead/managed/js/activeview/current/ufs_web_display.js339ms298ms32ms3rd
https://www.pbs.org/_next/static/chunks/161x_6-equb._.js141ms19ms11ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
34 scripts, 429 KB unused
FIX
34 scripts, 429 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...: 96 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QCNN...: 67 KB unused (39%)
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://pagead2.googlesyndication.com/pagead/manag...: 30 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 429 KB
429 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/m202604090101/pubads_impl.js?cb=31097905186 KB96 KB (52%)3rd
https://www.googletagmanager.com/gtag/js?id=G-QCNNW9XL0J&l=GTMDataLayer&cx=c&gtm=4e64h1171 KB67 KB (39%)3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayer153 KB55 KB (36%)3rd
https://pagead2.googlesyndication.com/pagead/managed/js/activeview/current/ufs_web_display.js73 KB30 KB (42%)3rd
https://www.pbs.org/_next/static/chunks/0s2nm2ovzd~eb.js71 KB24 KB (35%)3rd
https://www.pbs.org/_next/static/chunks/044p6v6o.ot5x.js9 KB3rd
https://www.pbs.org/_next/static/chunks/0en21d_uiy3kj.js18 KB3rd
https://www.pbs.org/_next/static/chunks/0o2fkeykpb~_~.js13 KB3rd
https://www.pbs.org/_next/static/chunks/071at27ynygse.js8 KB3rd

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
131 resources · 2.4 MB · 429 KB savings available
FIX
131 resources · 2.4 MB · 429 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~429 KB of savings available
Warning::
130 third-party resources (100% of weight)
Info::
1 resources over 200KB
131 resources · 2.4 MiB · 130 third-party 1.4 MiB over 1MB target
JavaScript 49% · 1.2 MiB
Image 23% · 572.2 KiB
Document 19% · 475.6 KiB
Other 4% · 91.7 KiB
Font 2% · 57.4 KiB
CSS 2% · 56.1 KiB

~428.8 KiB of savings available

Remove unused JavaScript: 428.8 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
45 images, 0 KB saveable
REVIEW
45 images, 0 KB saveable
Info::
All images are well-optimized
45 images 558 KB
0 oversized -0 KB
13 legacy format
0 missing dimensions CLS risk
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.9 s LCP 13.0 shttps://www-tc.pbs.org/pbsfonts/v1.2/PBSSans.woff2PBSSans.woff2 https://www-tc.pbs.org/pbsfonts/v1.2/PBSSans.woff2 — 28.9 KiB — 522 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 — 655 ms — font-display: swap
PBSSans.woff2 woff2 swap
Size 29 KB
Load time 522 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
PBSSans-Bold.woff2 woff2 swap
Size 28 KB
Load time 655 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
preload
3
dns-prefetch
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
131 requests over 6781ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.9 s LCP 13.0 shttps://pbs.org// https://pbs.org/ — 301 — 133 B — 747 ms — h2https://www.pbs.org/www.pbs.org/ https://www.pbs.org/ — 200 — 38.3 KiB — 943 ms — 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 — 238 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 — 275 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 — 4.5 KiB — 250 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 — 401 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 — 297 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 — 291 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 — 391 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 — 44 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 — 392 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 — 411 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 — 557 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 — 678 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 — 575 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 — 589 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 — 577 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 — 701 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 — 634 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 — 686 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 — 625 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 — 734 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 — 711 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 — 594 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 — 750 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 — 607 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 — 760 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 — 784 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 — 790 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 — 777 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.9 s LCP 13.0 shttps://pbs.org// https://pbs.org/ — 301 — 133 B — 747 ms — h2https://www.pbs.org/www.pbs.org/ https://www.pbs.org/ — 200 — 38.3 KiB — 943 ms — 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 — 238 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 — 275 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 — 4.5 KiB — 250 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 — 401 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 — 297 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 — 291 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 — 391 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 — 44 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 — 392 ms — 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https://pagead2.googlesyndication.com/pcs/activeview?xai=AKAOjst4bj7EBJnT8ySlVO7AvAJiCiG4YL3CrNZy99_2cHX8IyEDP3sWaUo2MM4FExSmqeXRYiB5V_yHSG5yHHC8lRmtyB2jx3-RuIu5mGF0-4jQMwWu9uVsegBL6wnOx1jsAbd7uaQfaxhDKXq7sWTVLv_H3JFuH-rC-Y85Nr1MMPkg63q7zrVnG2LC86g&sig=Cg0ArKJSzJwCtGO_xI9_EAE&id=lidar2&mcvt=1000&p=322,46,372,366&tm=1022.7999999523163&tu=22.700000047683716&mtos=1000,1000,1000,1000,1000&tos=1000,0,0,0,0&v=20260420&bin=7&avms=nio&bs=412,823&mc=1&vu=1&app=0&itpl=0&adk=1275447127&rs=4&la=0&cr=0&uach=WyJBbmRyb2lkIiwiMTEuMCIsIiIsIm1vdG8gZyBwb3dlciAoMjAyMikiLCIxNDYuMC4wLjAiLG51bGwsMSxudWxsLCI2NCIsW1siTm90LUEuQnJhbmQiLCIyNC4wLjAuMCJdLFsiQ2hyb21pdW0iLCIxNDYuMC43NjgwLjE2NCJdXSwwXQ%3D%3D&vs=4&r=v&co=7272977700&rst=1776796977781&rpt=130&isd=0&lsd=0&met=mue&wmsd=0&pbe=0&fle=0&vae=0&spb=0&sfl=0&ffslot=0&reach=8&io2=0 — 200 — 65 B — 13 ms — h3https://www.pbs.org/show/nature/?_rsc=p37crwww.pbs.org/show/nature/?_rsc=p37cr https://www.pbs.org/show/nature/?_rsc=p37cr — 200 — 2.2 KiB — 696 ms — h2https://global.ketchcdn.com/web/v3/ipglobal.ketchcdn.com/web/v3/ip https://global.ketchcdn.com/web/v3/ip — 200 — 424 B — 329 ms — h3https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=gpt&tv=m202604090101&st=env&sjk=118394028365523ep1.adtrafficquality.google/getconf... https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=gpt&tv=m202604090101&st=env&sjk=118394028365523 — 200 — 13.2 KiB — 31 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 — 689 ms — h2https://www.pbs.org/favicons/favicon.svgwww.pbs.org/favicons/favicon.svg https://www.pbs.org/favicons/favicon.svg — 200 — 2.4 KiB — 394 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 — 428 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 — 2.2 s — h2https://ep2.adtrafficquality.google/sodar/sodar2.jsep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2.js — 200 — 7.9 KiB — 17 ms — h2https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.htmlep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.html — 200 — 5.8 KiB — 29 ms — h2https://www.google.com/recaptcha/api2/aframewww.google.com/recaptcha/api2/afram... https://www.google.com/recaptcha/api2/aframe — 200 — 568 B — 49 ms — h3https://pagead2.googlesyndication.com/bg/f5QAlvtNIG4WVQkBqopU_UJKye32LJV4C0JimSvBZxA.jspagead2.googlesyndication.com/bg/f5... https://pagead2.googlesyndication.com/bg/f5QAlvtNIG4WVQkBqopU_UJKye32LJV4C0JimSvBZxA.js — 200 — 21.8 KiB — 25 ms — h3https://pagead2.googlesyndication.com/pagead/sodar?id=sodar2&v=254&li=gpt_m202604090101&jk=118394028365523&rc=pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/sodar?id=sodar2&v=254&li=gpt_m202604090101&jk=118394028365523&rc= — 204 — 17 B — 5 ms — h3https://ep2.adtrafficquality.google/generate_204?4F32_Aep2.adtrafficquality.google/generat... https://ep2.adtrafficquality.google/generate_204?4F32_A — 204 — 40 B — 4 ms — h2https://www.pbs.org/show/newshour/?_rsc=p37crwww.pbs.org/show/newshour/?_rsc=p37... https://www.pbs.org/show/newshour/?_rsc=p37cr — 200 — 2.2 KiB — 743 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 — 165 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=eyJzd2Jfd2Vic2l0ZV9zbWFydF90YWciOiJjMDIxZWIxYS1lOTgwLTQxZmItYjQ0NC0zNTY3ZDVhZTg3ZTAifQ%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=eyJzd2Jfd2Vic2l0ZV9zbWFydF90YWciOiJjMDIxZWIxYS1lOTgwLTQxZmItYjQ0NC0zNTY3ZDVhZTg3ZTAifQ%3D%3D&region=SG — 204 — 346 B — 317 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 — 171 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 — 568 B — 229 ms — h3https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=gpt_m202604090101&jk=118394028365523&bg=!CQqlCmjNAAY2C5OeFgs7AEcBe5WfOFRrF9gL942UiV1cpHZ7Tg8VWUmHDLFP6zgld1Sbk5RmOR2u8JXXCE2a-PacK9EMk1DwxzDsYsQ8AEe6xJdAwniWiwIAAABgUgAAAAZoAQd-ADYxZNocpI0jGcBvvuCA8bRzw3GdgVDakALJcz78Aoe9jbMuyLti8n95yfO8xmOiMQ54CQpMCQ0KAFFpzmvLz3lCMEUy167N9WwXaL1ZNE28bn0nfrxlhGsG5bNdADvvZlgSp8BqWnkU1If4vDE5R72MBs6013OAcFOUwiqEQJDcy1FuwR5VNvUyjzGZAqTldheKKpgUzSBjU0WM1819X78vXvFufZw2r7QYw7dKwsXdKLCNTYouY8bv07D8j_UCG47MlK1ayfikb7nPUtTv8KMWD7G4zuTzq9XpofCR__drrkv83PjJ146kWGOlNfHPsJaqjMXmUozZp-0OiY6OMFXJyiJK7PCIX1KbGShq96p4ktdrVKjgkghwt1luGeZ55dtIeoNoOB9M5Tapf7R-cKOM92MnElWfOOGta-hUFCt9r-aWhq8OCJTEf0eT-jtKttNc6cvG9fWfaPNdPnWrp1KqCaUDNh6GV5nk9fY-2Kb6_2uS0MJyRPjClSGJtuKcoRnqiI2YQriDqnzyieNS1jDti-HKQoveoEr_cdJDs8LxMD44NzXFayE3rAgQ3alUJ1S2v6s2l44soOG-J5nr7GSOVPS1YkUgXan8sRt4IKiyseIUZWlu4dkQKPPzjZikc4Lt7H6Ocb6mIa42vNDdpXCbxw4H6-QgP3ZuuaHJnyRsXQ6pHHOPgD-XafdHfirvdCOzFPJU-ZG6yt2V2mJ5dV-UGi5SVbYntTb3Y814OhzrvyVBMcwy9kKZwRZPqDR0SJ3eI2H1m-nuvw4dayGcPe74VBnk3hABTwgA_tGZG15dtUon7K2LKY3j_0DQnHhPhDRXOsWBAVxnXA-aQU6G6HB5v-vfIu_ZafE9VpwqNUby-ETxWCMX5A_6vrTHe_HRB-_8wyRiSXOYBojyNNJR1TEmCuzvJX7rjuELrnPYI3tWiao0-P5OQqXJnJDG5HJWkUTVZ8a4b39Mw3PnfpYo2AzJTUZkbvQdQK8FvO0kMPIXcio4q2urAg5eCAJTNT2aa2ARm7SAq_d6byAsAhZ-miW9i7EEmw5h7Pdq95k5HmvBkm9XEuU0Ry_LefIv_B1wSq1Oep1.adtrafficquality.google/pagead/... https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=gpt_m202604090101&jk=118394028365523&bg=!CQqlCmjNAAY2C5OeFgs7AEcBe5WfOFRrF9gL942UiV1cpHZ7Tg8VWUmHDLFP6zgld1Sbk5RmOR2u8JXXCE2a-PacK9EMk1DwxzDsYsQ8AEe6xJdAwniWiwIAAABgUgAAAAZoAQd-ADYxZNocpI0jGcBvvuCA8bRzw3GdgVDakALJcz78Aoe9jbMuyLti8n95yfO8xmOiMQ54CQpMCQ0KAFFpzmvLz3lCMEUy167N9WwXaL1ZNE28bn0nfrxlhGsG5bNdADvvZlgSp8BqWnkU1If4vDE5R72MBs6013OAcFOUwiqEQJDcy1FuwR5VNvUyjzGZAqTldheKKpgUzSBjU0WM1819X78vXvFufZw2r7QYw7dKwsXdKLCNTYouY8bv07D8j_UCG47MlK1ayfikb7nPUtTv8KMWD7G4zuTzq9XpofCR__drrkv83PjJ146kWGOlNfHPsJaqjMXmUozZp-0OiY6OMFXJyiJK7PCIX1KbGShq96p4ktdrVKjgkghwt1luGeZ55dtIeoNoOB9M5Tapf7R-cKOM92MnElWfOOGta-hUFCt9r-aWhq8OCJTEf0eT-jtKttNc6cvG9fWfaPNdPnWrp1KqCaUDNh6GV5nk9fY-2Kb6_2uS0MJyRPjClSGJtuKcoRnqiI2YQriDqnzyieNS1jDti-HKQoveoEr_cdJDs8LxMD44NzXFayE3rAgQ3alUJ1S2v6s2l44soOG-J5nr7GSOVPS1YkUgXan8sRt4IKiyseIUZWlu4dkQKPPzjZikc4Lt7H6Ocb6mIa42vNDdpXCbxw4H6-QgP3ZuuaHJnyRsXQ6pHHOPgD-XafdHfirvdCOzFPJU-ZG6yt2V2mJ5dV-UGi5SVbYntTb3Y814OhzrvyVBMcwy9kKZwRZPqDR0SJ3eI2H1m-nuvw4dayGcPe74VBnk3hABTwgA_tGZG15dtUon7K2LKY3j_0DQnHhPhDRXOsWBAVxnXA-aQU6G6HB5v-vfIu_ZafE9VpwqNUby-ETxWCMX5A_6vrTHe_HRB-_8wyRiSXOYBojyNNJR1TEmCuzvJX7rjuELrnPYI3tWiao0-P5OQqXJnJDG5HJWkUTVZ8a4b39Mw3PnfpYo2AzJTUZkbvQdQK8FvO0kMPIXcio4q2urAg5eCAJTNT2aa2ARm7SAq_d6byAsAhZ-miW9i7EEmw5h7Pdq95k5HmvBkm9XEuU0Ry_LefIv_B1wSq1O — 204 — 17 B — 10 ms — h3https://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 — 171 ms — h3https://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 — 289 ms — h3
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 7236ms · 1053KB · €116/mo
www.pbs.org
Other
Costly
Execution 2125ms
Transfer 71 KB
Unused 35%
Monthly Cost €34/mo
Unattributable
Other
Costly
Execution 1101ms
Transfer 0 KB
Monthly Cost €18/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 800ms
Transfer 186 KB
Unused 52%
Monthly Cost €13/mo
www.pbs.org
Other
Costly
Execution 733ms
Transfer 38 KB
Monthly Cost €12/mo
cdn.ketchjs.com
Other
Costly
Execution 653ms
Transfer 257 KB
Unused 61%
Monthly Cost €10/mo
Google Tag Manager
Tag Manager
Costly
Execution 426ms
Transfer 153 KB
Unused 36%
Monthly Cost €7/mo
Google Tag Manager
Tag Manager
Costly
Execution 384ms
Transfer 171 KB
Unused 39%
Monthly Cost €6/mo
www.pbs.org
Other
Costly
Execution 352ms
Transfer 38 KB
Monthly Cost €6/mo
pagead2.googlesyndication.com
Other
Costly
Execution 339ms
Transfer 73 KB
Unused 42%
Monthly Cost €5/mo
www.pbs.org
Other
Optional
Execution 141ms
Transfer 24 KB
Monthly Cost €2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 125ms
Transfer 34 KB
Monthly Cost €2/mo
ep2.adtrafficquality.google
Other
Optional
Execution 58ms
Transfer 8 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.pbs.org adds 2125ms and costs ~€34/month
  • Unattributable adds 1101ms and costs ~€18/month
  • securepubads.g.doubleclick.net adds 800ms and costs ~€13/month
  • www.pbs.org adds 733ms and costs ~€12/month
  • cdn.ketchjs.com adds 653ms and costs ~€10/month
  • Google Tag Manager adds 426ms and costs ~€7/month
  • Google Tag Manager adds 384ms and costs ~€6/month
  • www.pbs.org adds 352ms and costs ~€6/month
  • pagead2.googlesyndication.com adds 339ms and costs ~€5/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 2125ms 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 1101ms 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

securepubads.g.doubleclick.net takes 800ms 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

52% 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

www.pbs.org takes 733ms 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 653ms 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

Google Tag Manager takes 426ms 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 384ms 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

www.pbs.org takes 352ms 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

pagead2.googlesyndication.com takes 339ms 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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