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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
70
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.

2.15 s

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

2.67 s

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

131 ms

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

0.005

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

2.63 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.

3.82 s

Page Load Progression

412 ms
825 ms
1.2 s
1.6 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
4.2 MB transferred, 60 requests
FIX
4.2 MB transferred, 60 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 805 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 805 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::
60 HTTP requests
Info::
Estimated 0.88 g CO2 per page load
4.2 MB / 2.4 MB budget
4.2 MB transferred
60 requests
0.88 g CO2 per page load
Images 2.2 MiB 53%
JavaScript 805.4 KiB 19%
Fonts 729.0 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
D
Page Weight Inventory
Action
60 resources · 4.2 MB · 281 KB savings available
FIX
60 resources · 4.2 MB · 281 KB savings available
Warning::
Page weight 3.2 MB over 1MB target
Got: 4.2 MB Expected: ≤ 1 MB
Info::
~281 KB of savings available
Warning::
59 third-party resources (100% of weight)
Info::
6 resources over 200KB
60 resources · 4.2 MiB · 59 third-party 3.2 MiB over 1MB target
Image 53% · 2.2 MiB
JavaScript 19% · 805.4 KiB
Font 17% · 729.0 KiB
Document 9% · 380.5 KiB
CSS 1% · 44.4 KiB
Other 1% · 33.8 KiB

~280.9 KiB of savings available

Remove unused JavaScript: 280.9 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 Execution Cost
Action
1787ms total JS execution
REVIEW
1787ms total JS execution
Warning::
https://www.nationalacademies.org/: 441ms CPU time
Warning::
https://www.nationalacademies.org/build/assets/app...: 354ms CPU time
Info::
https://js.hs-analytics.net/analytics/177680310000...: 216ms CPU time
Info::
Unattributable: 202ms CPU time
Info::
https://admin-pipeline.upsun-us.observability-pipe...: 132ms CPU time
Warning::
Third-party scripts: 1787ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Style & Layout 31% Other 17% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.nationalacademies.org/441ms3ms1ms3rd
https://www.nationalacademies.org/build/assets/app-DrqUutlo.js354ms38ms0ms3rd
https://js.hs-analytics.net/analytics/1776803100000/49197025.js216ms143ms3ms3rd
Unattributable202ms25ms0ms3rd
https://admin-pipeline.upsun-us.observability-pipeline.blackfire.io/js/probe.js132ms93ms2ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js114ms98ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K5ZR4BL2100ms83ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-95DFGJ1W4R&cx=c&gtm=4e64k0h288ms72ms15ms3rd
https://cdn.cookielaw.org/scripttemplates/6.30.0/otBannerSdk.js86ms48ms9ms3rd
https://www.nationalacademies.org/build/assets/swiper-DvD3UiYG.js54ms12ms0ms3rd
C
JS Bundles
Action
20 scripts, 281 KB unused
REVIEW
20 scripts, 281 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-95DF...: 69 KB unused (41%)
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...: 32 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 281 KB
281 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-95DFGJ1W4R&cx=c&gtm=4e64k0h2170 KB69 KB (41%)✓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 KB32 KB (33%)✓3rd
https://cl.qualaroo.com/ki.js/80830/iOh.js61 KB24 KB (41%)✓3rd
https://js.hs-scripts.com/49197025.js1 KB—✓3rd
https://js.hsadspixel.net/pixels.js4 KB—✓3rd
https://www.clarity.ms/tag/ux9mtioswv?ref=gtm1 KB—✓3rd
https://www.nationalacademies.org/build/assets/swiper-DvD3UiYG.js23 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 FCP 2.1 s LCP 2.7 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 — 374 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 — 390 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 — 2.4 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 — 77.0 KiB — 660 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 — 651 ms — font-display: swap
futura_pt_book-Dr0dSsR4... woff2 swap
Size 30 KB
Load time 374 ms
Start 695 ms
Risk FOUT — text flashes from fallback to web font
futura_pt_demi-3gCD-FYR... woff2 swap
Size 31 KB
Load time 390 ms
Start 695 ms
Risk FOUT — text flashes from fallback to web font
Merriweather-CE7fvhdA.w... woff2 swap
Size 500 KB
Load time 2.4 s
Start 696 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 660 ms
Start 696 ms
Risk FOUT — text flashes from fallback to web font
MerriweatherSans-BKJNHG... woff2 swap
Size 92 KB
Load time 651 ms
Start 697 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
60 requests over 5222ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.1 s LCP 2.7 shttps://nationalacademies.org// https://nationalacademies.org/ — 301 — 138 B — 281 ms — http/1.0https://www.nationalacademies.org/www.nationalacademies.org/ https://www.nationalacademies.org/ — 200 — 379.8 KiB — 876 ms — 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 — 374 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 — 390 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 — 2.4 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 — 77.0 KiB — 660 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 — 651 ms — 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 — 582 ms — http/1.1https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 34 ms — h2https://www.nationalacademies.org/build/assets/app-DrqUutlo.jswww.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/app-DrqUutlo.js — 200 — 72.0 KiB — 146 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 — 421 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 — 138.1 KiB — 97 ms — h2https://cdn.cookielaw.org/consent/01a069a5-321b-4bea-bd76-c2b146b7253c-test/01a069a5-321b-4bea-bd76-c2b146b7253c-test.jsoncdn.cookielaw.org/consent/01a069a5-... https://cdn.cookielaw.org/consent/01a069a5-321b-4bea-bd76-c2b146b7253c-test/01a069a5-321b-4bea-bd76-c2b146b7253c-test.json — 200 — 2.0 KiB — 45 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 — 107 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 — 70 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 — 101 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 — 119 ms — h2data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' cla…www.w3.org/2000/svg' width='20' hei... data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' fill='none' cla… — 200 — 0 B — 0 ms — datahttps://www.nationalacademies.org/sanctum/csrf-cookie?t=1776803184478www.nationalacademies.org/sanctum/c... https://www.nationalacademies.org/sanctum/csrf-cookie?t=1776803184478 — 204 — 1.7 KiB — 343 ms — http/1.1https://www.nationalacademies.org/build/assets/swiper-DvD3UiYG.jswww.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/swiper-DvD3UiYG.js — 200 — 23.3 KiB — 83 ms — http/1.1https://www.nationalacademies.org/build/assets/utils-B82b6m7r.jswww.nationalacademies.org/build/ass... https://www.nationalacademies.org/build/assets/utils-B82b6m7r.js — 200 — 3.2 KiB — 85 ms — http/1.1https://cdn.cookielaw.org/scripttemplates/6.30.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/6... https://cdn.cookielaw.org/scripttemplates/6.30.0/otBannerSdk.js — 200 — 79.3 KiB — 21 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 — 17 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 — 33 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 — 30 ms — h2https://www.googletagmanager.com/gtag/js?id=G-95DFGJ1W4R&cx=c&gtm=4e64k0h2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-95DFGJ1W4R&cx=c&gtm=4e64k0h2 — 200 — 170.3 KiB — 71 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 — 221 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 — 40 ms — h2https://js.hs-scripts.com/49197025.jsjs.hs-scripts.com/49197025.js https://js.hs-scripts.com/49197025.js — 200 — 1.1 KiB — 42 ms — h2https://www.nationalacademies.org/authStatuswww.nationalacademies.org/authStatu... https://www.nationalacademies.org/authStatus — 200 — 1.8 KiB — 265 ms — http/1.1
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https://ingest.upsun-us.observability-pipeline.blackfire.io/browser/v1/input/metrics?k=1ffa7a173298cf158c330b794f1770f5df313b92b077d1c5eaecd48144bc94b0&u=4.1&s=H4sIAAAAAAACA42PzW7DIBCE32XPTgI2sQm3qpfeq94iWWsMCaljLENjVZHfvYudNtdeYPbnG4Y7aFDwMgzH41uMdL76Po6-68wYqOWvZsCTeTaVqmvX3_yngQy-CD0TFdRuN03TtsfofI8damzN1Zmw9eNpR4sBFM-go3XTbz7eqXOJjiptc91Ky_LGmAOXRVlYnrdlxQvJuW0wocuibGx1YLIRe1E1VgsmEEVpdWO51bJKYW7_dqxbUHeYajdRrGLPsqTPoA6CpSmSLNkqKfIq4q8gRq5DTTa5SOoJOPqpxS6YVHh8QJ5o6LBvg8bBbIbRXXH8XqIMfyar8ZyBXvMtF0ulSbg4QdJjjI9uaB9PzfMPEAmvysUBAAA&t=H4sIAAAAAAACAy3M0QpAQBAF0H-5z8js1uzYnxF2prxIbCTtv6O8n86NjIhVN6t1yduFCjsihcDSehJuiF2FhHgj9_NLJ3NTEmvdqNqRePZGLnEgL0Q2Dvi1fu8x64lSygMX96t1ZgAAAA.H4sIAAAAAAACA0WNzQrCMBCE32XPjeSnJiFXwbMHXyDSpQSStDQxIiXv7oqKl4Gd-XZmhwoOHnhjLVQfCwxQwAljtOVKWH0QdoAJ3P6R7BMSfz5dCGw-3ukSVsgBNl9DninLiFNhIa3b0jBhrkROGKv_kYGaoB3Zf0RoyUY1am6N5lxJRS_ZtzBT55Kvz_W9-TUQeu8vJPA5tbYAAAA.H4sIAAAAAAACA22OSwrDMAxE76K1E6w4ke0su-gJcgGXGGNIndK4LiX47lU_0E21EIx4M6MdMoxw96emxOyWDQRsMKLWZKRCQy2aXsAM4_5ZyZ09G6bpeGC0uOXGkqRqjX2PJhwMCri6HFNgMqzrzOTsl-z-kpFzoQzNrxOpa_pOdzQYq6y0iv3JlRg4c03T4_L64HvwUGt9AuYprdfFAAAA.H4sIAAAAAAACAxWNSQ7DIBRD7_LXEUNIgHCZ6JehRWpJBLQsoty9sLL9ZNkXVDBQM6YSazwSTFDAcKWkZoJrSQQTEzgwF_z22KthtUzyLcy4BCYVyofT2s6MLZtYhcI-MBZdzN7WHsK3pwHPrnSYAV61nsVQ2lojCccxvtGi85_oCznyk8J9_wHv8RXsnAAAAA — 200 — 126 B — 130 ms — h2https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=0F5A311F932849F59E0A0FD8CA1D5012&MUID=278B799AC94060A234F96ED8C8C36191c.clarity.ms/c.gif?ctsa=mr&CtsSyncI... https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=0F5A311F932849F59E0A0FD8CA1D5012&MUID=278B799AC94060A234F96ED8C8C36191 — 200 — 466 B — 27 ms — h2https://www.nationalacademies.org/favicon.icowww.nationalacademies.org/favicon.i... https://www.nationalacademies.org/favicon.ico — 200 — 15.5 KiB — 78 ms — http/1.1https://b.clarity.ms/collectb.clarity.ms/collect https://b.clarity.ms/collect — 204 — 289 B — 79 ms — http/1.1
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 1787ms · 1028KB · $24/mo
www.nationalacademies.org
Other
Costly
Execution 441ms
Transfer 380 KB
Monthly Cost $6/mo
www.nationalacademies.org
Other
Costly
Execution 354ms
Transfer 72 KB
Unused 74%
Monthly Cost $5/mo
HubSpot Analytics
Analytics
Costly
Execution 216ms
Transfer 42 KB
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 202ms
Transfer 0 KB
Monthly Cost $3/mo
admin-pipeline.upsun-us.observability-pipeline.blackfire.io
Other
Optional
Execution 132ms
Transfer 97 KB
Unused 33%
Monthly Cost $2/mo
Microsoft Clarity
Session Replay
Optional
Execution 114ms
Transfer 26 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 100ms
Transfer 138 KB
Unused 45%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 170 KB
Unused 41%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 86ms
Transfer 79 KB
Unused 52%
Monthly Cost $1/mo
www.nationalacademies.org
Other
Optional
Execution 54ms
Transfer 23 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.nationalacademies.org adds 441ms and costs ~$6/month
  • www.nationalacademies.org adds 354ms and costs ~$5/month
  • HubSpot Analytics adds 216ms and costs ~$3/month
  • Unattributable 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.nationalacademies.org takes 441ms 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 354ms 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

HubSpot Analytics takes 216ms 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 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

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

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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