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https://nationalacademies.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
34
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

4.06 s

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

6.99 s

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

2.22 s

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

0.064

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

6.41 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.

17.85 s

Page Load Progression

463 ms
925 ms
1.4 s
1.9 s
2.3 s
2.8 s
3.2 s
3.7 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.2 MB transferred, 61 requests
FIX
4.2 MB transferred, 61 requests
Critical::
Page weighs 5.8 MB (4.2 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Warning::
JavaScript is 806 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 806 KB
Info::
Fonts are 729 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 729 KB
Info::
61 HTTP requests
Info::
Estimated 0.88 g CO2 per page load
4.2 MB / 2.4 MB budget
4.2 MB transferred
61 requests
0.88 g CO2 per page load
Images 2.2 MiB 53%
JavaScript 805.9 KiB 19%
Fonts 728.9 KiB 17%
HTML 380.5 KiB 9%
CSS 40.1 KiB 1%
Other 30.9 KiB 1%
Other 17.6 KiB 0%
Other 5.1 KiB 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

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 (4.2 MiB of 4.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7774ms total JS execution
FIX
7774ms total JS execution
Warning::
https://www.nationalacademies.org/: 2371ms CPU time
Warning::
https://js.hs-analytics.net/analytics/177680310000...: 1113ms CPU time
Warning::
Unattributable: 801ms CPU time
Warning::
https://www.nationalacademies.org/build/assets/app...: 707ms CPU time
Warning::
https://admin-pipeline.upsun-us.observability-pipe...: 617ms CPU time
Warning::
Third-party scripts: 7774ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Style & Layout 29% Other 17% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.nationalacademies.org/2371ms19ms5ms3rd
https://js.hs-analytics.net/analytics/1776803100000/49197025.js1113ms684ms11ms3rd
Unattributable801ms86ms0ms3rd
https://www.nationalacademies.org/build/assets/app-DrqUutlo.js707ms150ms1ms3rd
https://admin-pipeline.upsun-us.observability-pipeline.blackfire.io/js/probe.js617ms398ms17ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K5ZR4BL2471ms396ms66ms3rd
https://www.googletagmanager.com/gtag/js?id=G-95DFGJ1W4R&cx=c&gtm=4e64h1404ms344ms57ms3rd
https://cdn.cookielaw.org/scripttemplates/6.30.0/otBannerSdk.js343ms214ms30ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js295ms224ms8ms3rd
https://js.hscollectedforms.net/collectedforms.js218ms186ms8ms3rd

Showing top 10 of 14 scripts

D
Page Weight Inventory
Action
61 resources · 4.2 MB · 279 KB savings available
FIX
61 resources · 4.2 MB · 279 KB savings available
Warning::
Page weight 3.2 MB over 1MB target
Got: 4.2 MB Expected: ≤ 1 MB
Info::
~279 KB of savings available
Warning::
60 third-party resources (100% of weight)
Info::
6 resources over 200KB
61 resources · 4.2 MiB · 60 third-party 3.2 MiB over 1MB target
Image 53% · 2.2 MiB
JavaScript 19% · 805.9 KiB
Font 17% · 728.9 KiB
Document 9% · 380.5 KiB
CSS 1% · 44.5 KiB
Other 1% · 33.8 KiB

~279.5 KiB of savings available

Remove unused JavaScript: 279.5 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
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Info::
All images are well-optimized
13 images 2.2 MB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
21 scripts, 279 KB unused
REVIEW
21 scripts, 279 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-95DF...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K5Z...: 62 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nationalacademies.org/build/assets/app...: 53 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/6.30.0/o...: 41 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://admin-pipeline.upsun-us.observability-pipe...: 30 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 279 KB
279 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-95DFGJ1W4R&cx=c&gtm=4e64h1170 KB69 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K5ZR4BL2138 KB62 KB (45%)✓3rd
https://www.nationalacademies.org/build/assets/app-DrqUutlo.js72 KB53 KB (74%)✓3rd
https://cdn.cookielaw.org/scripttemplates/6.30.0/otBannerSdk.js79 KB41 KB (52%)✓3rd
https://admin-pipeline.upsun-us.observability-pipeline.blackfire.io/js/probe.js97 KB30 KB (32%)✓3rd
https://cl.qualaroo.com/ki.js/80830/iOh.js61 KB24 KB (41%)✓3rd
https://scripts.clarity.ms/0.8.59/clarity.js26 KB—✓3rd
https://www.clarity.ms/tag/ux9mtioswv?ref=gtm1 KB—✓3rd
https://js.hscollectedforms.net/collectedforms.js26 KB—✓3rd
https://js.hs-banner.com/v2/49197025/banner.js24 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

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
5 fonts (729 KB)
PASS
5 fonts (729 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

729 KB total

Render-blocking

0

of 5

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 5.0 s 6.0 s 7.0 s FCP 4.1 s LCP 7.0 shttps://www.nationalacademies.org/build/assets/futura_pt_book-Dr0dSsR4.woff2futura_pt_book-Dr0dSsR4... https://www.nationalacademies.org/build/assets/futura_pt_book-Dr0dSsR4.woff2 — 29.5 KiB — 514 ms — font-display: swaphttps://www.nationalacademies.org/build/assets/futura_pt_demi-3gCD-FYR.woff2futura_pt_demi-3gCD-FYR... https://www.nationalacademies.org/build/assets/futura_pt_demi-3gCD-FYR.woff2 — 30.9 KiB — 496 ms — font-display: swaphttps://www.nationalacademies.org/build/assets/Merriweather-CE7fvhdA.woff2Merriweather-CE7fvhdA.w... https://www.nationalacademies.org/build/assets/Merriweather-CE7fvhdA.woff2 — 499.8 KiB — 1.0 s — font-display: swaphttps://www.nationalacademies.org/build/assets/Merriweather-Italic-DjkP74aH.woff2Merriweather-Italic-Djk... https://www.nationalacademies.org/build/assets/Merriweather-Italic-DjkP74aH.woff2 — 76.9 KiB — 505 ms — font-display: swaphttps://www.nationalacademies.org/build/assets/MerriweatherSans-BKJNHGBy.woff2MerriweatherSans-BKJNHG... https://www.nationalacademies.org/build/assets/MerriweatherSans-BKJNHGBy.woff2 — 91.7 KiB — 1.2 s — font-display: swap
futura_pt_book-Dr0dSsR4... woff2 swap
Size 30 KB
Load time 514 ms
Start 730 ms
Risk FOUT — text flashes from fallback to web font
futura_pt_demi-3gCD-FYR... woff2 swap
Size 31 KB
Load time 496 ms
Start 730 ms
Risk FOUT — text flashes from fallback to web font
Merriweather-CE7fvhdA.w... woff2 swap
Size 500 KB
Load time 1.0 s
Start 731 ms
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
Merriweather-Italic-Djk... woff2 swap
Size 77 KB
Load time 505 ms
Start 732 ms
Risk FOUT — text flashes from fallback to web font
MerriweatherSans-BKJNHG... woff2 swap
Size 92 KB
Load time 1.2 s
Start 733 ms
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)

Fixing the unchecked items could save ~250 KB and ~500 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
—

6 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
61 requests over 5815ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.1 s LCP 7.0 shttps://nationalacademies.org// https://nationalacademies.org/ — 301 — 138 B — 273 ms — http/1.0https://www.nationalacademies.org/www.nationalacademies.org/ https://www.nationalacademies.org/ — 200 — 379.8 KiB — 1.8 s — http/1.1https://www.nationalacademies.org/build/assets/futura_pt_book-Dr0dSsR4.woff2www.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/futura_pt_book-Dr0dSsR4.woff2 — 200 — 29.5 KiB — 514 ms — http/1.1https://www.nationalacademies.org/build/assets/futura_pt_demi-3gCD-FYR.woff2www.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/futura_pt_demi-3gCD-FYR.woff2 — 200 — 30.9 KiB — 496 ms — http/1.1https://www.nationalacademies.org/build/assets/Merriweather-CE7fvhdA.woff2www.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/Merriweather-CE7fvhdA.woff2 — 200 — 499.8 KiB — 1.0 s — http/1.1https://www.nationalacademies.org/build/assets/Merriweather-Italic-DjkP74aH.woff2www.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/Merriweather-Italic-DjkP74aH.woff2 — 200 — 76.9 KiB — 505 ms — http/1.1https://www.nationalacademies.org/build/assets/MerriweatherSans-BKJNHGBy.woff2www.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/MerriweatherSans-BKJNHGBy.woff2 — 200 — 91.7 KiB — 1.2 s — http/1.1https://www.nationalacademies.org/build/assets/app-Caz1cByw.csswww.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/app-Caz1cByw.css — 200 — 40.1 KiB — 501 ms — http/1.1https://admin-pipeline.upsun-us.observability-pipeline.blackfire.io/js/probe.jsadmin-pipeline.upsun-us.observabili... https://admin-pipeline.upsun-us.observability-pipeline.blackfire.io/js/probe.js — 200 — 96.8 KiB — 425 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-K5ZR4BL2www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-K5ZR4BL2 — 200 — 138.4 KiB — 90 ms — h2https://nationalacademies.bynder.com/asset/4557dd84-7c45-4bc4-8fa1-3769705d1169/Landscape_2500/iStock-1496792046-jpg.jpgnationalacademies.bynder.com/asset/... https://nationalacademies.bynder.com/asset/4557dd84-7c45-4bc4-8fa1-3769705d1169/Landscape_2500/iStock-1496792046-jpg.jpg — 200 — 578.8 KiB — 145 ms — h2https://nationalacademies.bynder.com/asset/6450d43f-9f9e-434c-8600-4b0163d02357/Landscape_2500/iStock-1250691642-jpg.jpgnationalacademies.bynder.com/asset/... https://nationalacademies.bynder.com/asset/6450d43f-9f9e-434c-8600-4b0163d02357/Landscape_2500/iStock-1250691642-jpg.jpg — 200 — 285.0 KiB — 91 ms — h2https://nationalacademies.bynder.com/m/21382fa3a15b10be/Landscape_2500-Getty-1340129773-jpg.jpgnationalacademies.bynder.com/m/2138... https://nationalacademies.bynder.com/m/21382fa3a15b10be/Landscape_2500-Getty-1340129773-jpg.jpg — 200 — 409.6 KiB — 138 ms — h2https://nationalacademies.bynder.com/m/4ec6095e4896e0da/Landscape_2500-Getty-1320531182-jpg.jpgnationalacademies.bynder.com/m/4ec6... https://nationalacademies.bynder.com/m/4ec6095e4896e0da/Landscape_2500-Getty-1320531182-jpg.jpg — 200 — 704.0 KiB — 174 ms — h2https://nationalacademies.bynder.com/asset/8030e01a-453d-4483-a11c-af1b10b4b85e/Landscape_1000/6309x3930.jpgnationalacademies.bynder.com/asset/... https://nationalacademies.bynder.com/asset/8030e01a-453d-4483-a11c-af1b10b4b85e/Landscape_1000/6309x3930.jpg — 200 — 81.5 KiB — 31 ms — h2https://nationalacademies.bynder.com/asset/4b1b0ec5-bb82-49c6-bdf1-d392cb1612ef/Landscape_1000/Marcia-McNutt-by-Christopher-Michel-286012-4-19-23_.jpgnationalacademies.bynder.com/asset/... https://nationalacademies.bynder.com/asset/4b1b0ec5-bb82-49c6-bdf1-d392cb1612ef/Landscape_1000/Marcia-McNutt-by-Christopher-Michel-286012-4-19-23_.jpg — 200 — 79.5 KiB — 41 ms — h2https://nationalacademies.bynder.com/asset/c17e05b5-be83-4e4e-ac27-7a146ed76af4/Landscape_1000/sigelmanhrrevcopy.jpgnationalacademies.bynder.com/asset/... https://nationalacademies.bynder.com/asset/c17e05b5-be83-4e4e-ac27-7a146ed76af4/Landscape_1000/sigelmanhrrevcopy.jpg — 200 — 125.7 KiB — 91 ms — h2https://www.googletagmanager.com/gtag/js?id=G-95DFGJ1W4R&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-95DFGJ1W4R&cx=c&gtm=4e64h1 — 200 — 170.5 KiB — 70 ms — h2https://www.clarity.ms/tag/ux9mtioswv?ref=gtmwww.clarity.ms/tag/ux9mtioswv?ref=g... https://www.clarity.ms/tag/ux9mtioswv?ref=gtm — 200 — 1.1 KiB — 266 ms — http/1.1https://cl.qualaroo.com/ki.js/80830/iOh.jscl.qualaroo.com/ki.js/80830/iOh.js https://cl.qualaroo.com/ki.js/80830/iOh.js — 200 — 60.5 KiB — 42 ms — h2https://js.hs-scripts.com/49197025.jsjs.hs-scripts.com/49197025.js https://js.hs-scripts.com/49197025.js — 200 — 1.1 KiB — 56 ms — h2https://js.hs-analytics.net/analytics/1776803100000/49197025.jsjs.hs-analytics.net/analytics/17768... https://js.hs-analytics.net/analytics/1776803100000/49197025.js — 200 — 42.3 KiB — 77 ms — h2https://js.hsadspixel.net/pixels.jsjs.hsadspixel.net/pixels.js https://js.hsadspixel.net/pixels.js — 200 — 3.9 KiB — 36 ms — h2https://js.hscollectedforms.net/collectedforms.jsjs.hscollectedforms.net/collectedfo... https://js.hscollectedforms.net/collectedforms.js — 200 — 26.4 KiB — 44 ms — h2https://js.hs-banner.com/v2/49197025/banner.jsjs.hs-banner.com/v2/49197025/banner... https://js.hs-banner.com/v2/49197025/banner.js — 200 — 24.1 KiB — 45 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-95DFGJ1W4R&gtm=45je64h1v9186907987z89195236020za20gzb9195236020zd9195236020&_p=1776803162624&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1923741193.1776803163&frm=0&pscdl=noapi&rcb=18&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401&sid=1776803163&sct=1&seg=0&dl=https%3A%2F%2Fwww.nationalacademies.org%2F&dt=National%20Academies%20of%20Sciences%2C%20Engineering%2C%20and%20Medicine&en=page_view&_fv=1&_nsi=1&_ss=1&ep.hashtag=&ep.content_type=%3E&ep.login_status=logged%20in&tfd=1733www.google-analytics.com/g/collect?... 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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
100% of JavaScript execution is third-party
First-party Third-party 7774ms · 1143KB · $103/mo
www.nationalacademies.org
Other
Costly
Execution 2371ms
Transfer 380 KB
Monthly Cost $31/mo
HubSpot Analytics
Analytics
Costly
Execution 1113ms
Transfer 42 KB
Monthly Cost $15/mo
Unattributable
Other
Costly
Execution 801ms
Transfer 0 KB
Monthly Cost $11/mo
www.nationalacademies.org
Other
Costly
Execution 707ms
Transfer 72 KB
Unused 74%
Monthly Cost $9/mo
admin-pipeline.upsun-us.observability-pipeline.blackfire.io
Other
Costly
Execution 617ms
Transfer 97 KB
Unused 32%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 471ms
Transfer 138 KB
Unused 45%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 404ms
Transfer 170 KB
Unused 40%
Monthly Cost $5/mo
OneTrust
Consent
Essential
Execution 343ms
Transfer 79 KB
Unused 52%
Monthly Cost $5/mo
Microsoft Clarity
Session Replay
Costly
Execution 295ms
Transfer 26 KB
Monthly Cost $4/mo
js.hscollectedforms.net
Other
Costly
Execution 218ms
Transfer 26 KB
Monthly Cost $3/mo
cl.qualaroo.com
Other
Optional
Execution 171ms
Transfer 61 KB
Unused 41%
Monthly Cost $2/mo
www.nationalacademies.org
Other
Optional
Execution 117ms
Transfer 23 KB
Monthly Cost $2/mo
LinkedIn Insight
Advertising
Optional
Execution 88ms
Transfer 19 KB
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 59ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.nationalacademies.org adds 2371ms and costs ~$31/month
  • HubSpot Analytics adds 1113ms and costs ~$15/month
  • Unattributable adds 801ms and costs ~$11/month
  • www.nationalacademies.org adds 707ms and costs ~$9/month
  • admin-pipeline.upsun-us.observability-pipeline.blackfire.io adds 617ms and costs ~$8/month
  • Google Tag Manager adds 471ms and costs ~$6/month
  • Google Tag Manager adds 404ms and costs ~$5/month
  • Microsoft Clarity adds 295ms and costs ~$4/month
  • js.hscollectedforms.net adds 218ms 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.nationalacademies.org takes 2371ms 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

HubSpot Analytics takes 1113ms 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 801ms 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.nationalacademies.org takes 707ms 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 www.nationalacademies.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

admin-pipeline.upsun-us.observability-pipeline.blackfire.io takes 617ms 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 471ms 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 404ms 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 OneTrust'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

Microsoft Clarity takes 295ms 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

js.hscollectedforms.net takes 218ms 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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