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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
65
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.
73
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.

944 ms

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

7.20 s

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

73 ms

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

0.006

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

3.82 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.

7.21 s

Page Load Progression

526 ms
1.1 s
1.6 s
2.1 s
2.6 s
3.2 s
3.7 s
4.2 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
6.9 MB transferred, 89 requests
FIX
6.9 MB transferred, 89 requests
Critical::
Page weighs 12.5 MB (6.9 MB transferred)
Warning::
Images are 4.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.2 MB
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Info::
Fonts are 519 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 519 KB
Info::
89 HTTP requests
Info::
Estimated 1.4 g CO2 per page load
6.9 MB / 2.4 MB budget
6.9 MB transferred
89 requests
1.4 g CO2 per page load
Images 4.2 MiB 61%
JavaScript 1.9 MiB 27%
Fonts 519.4 KiB 7%
CSS 168.7 KiB 2%
HTML 124.3 KiB 2%
Other 8.0 KiB 0%
Other 2.7 KiB 0%
Other 1.9 KiB 0%
Other 881 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (6.9 MiB of 6.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
24 scripts, 516 KB unused
FIX
24 scripts, 516 KB unused
Warning::
https://www.nga.gov/sites/default/files/js/js_VmAc...: 187 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PZ7...: 61 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-GHV9...: 60 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-174...: 56 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-156...: 55 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 516 KB
516 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nga.gov/sites/default/files/js/js_VmAceQOTHcCqsz-PcMnN_rFOV5_1px_HZuqfPFFpXDo.js?scope=footer&delta=0&language=en&theme=nga&include=eJxdikEKwzAMBD_kRk8Sm1gIFVmCRKV9fhzIpbnsMsOs_pENXYrxxo-3jJIouv91SQttmqkuXFDSOU9eru5fjjYsLHeECh8YTg9e0KdpoSD1XOHtsJKvdWG47EUzrxNl6j3b263 KB187 KB (72%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PZ767HM4179 KB61 KB (34%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-GHV9J3QQQ0&cx=c&gtm=4e64k0176 KB60 KB (34%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-17453802637&cx=c&gtm=4e64k0137 KB56 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-15686668&cx=c&gtm=4e64k0131 KB55 KB (42%)✓3rd
https://cdn.mouseflow.com/projects/cffcefda-11c8-49f7-9bf7-7744e2f4e1f8.js53 KB40 KB (77%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (35%)✓3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js30 KB23 KB (75%)✓3rd
https://www.nga.gov/sites/default/files/js/js_z6zOEHhbX51fRzev1FQqkCaHx-Ia1KmSehBcxTDANC8.js?scope=header&delta=1&language=en&theme=nga&include=eJzLS0_Uz0_NTUpN0a3MLy0pTUoFAEFjBww1 KB—✓3rd
https://connect.facebook.net/signals/config/806185425072684?v=2.9.303&r=stable&domain=www.nga.gov&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16845 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
89 resources · 6.9 MB · 516 KB savings available
FIX
89 resources · 6.9 MB · 516 KB savings available
Warning::
Page weight 5.9 MB over 1MB target
Got: 6.9 MB Expected: ≤ 1 MB
Info::
~516 KB of savings available
Warning::
88 third-party resources (100% of weight)
Info::
9 resources over 200KB
89 resources · 6.9 MiB · 88 third-party 5.9 MiB over 1MB target
Image 61% · 4.2 MiB
JavaScript 27% · 1.9 MiB
Font 7% · 519.4 KiB
CSS 2% · 168.7 KiB
Document 2% · 133.7 KiB
Other 0% · 3.3 KiB

~516.2 KiB of savings available

Remove unused JavaScript: 516.2 KiB
B
Image Optimization
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://www.nga.gov/themes/custom/nga/logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 4.2 MB
0 oversized -0 KB
20 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1009ms total JS execution
REVIEW
1009ms total JS execution
Warning::
https://www.nga.gov/sites/default/files/js/js_VmAc...: 316ms CPU time
Info::
https://www.nga.gov/: 233ms CPU time
Info::
Unattributable: 140ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PZ7...: 94ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-174...: 81ms CPU time
Warning::
Third-party scripts: 1009ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 24% Style & Layout 16% Script Parsing & Compilation 7% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.nga.gov/sites/default/files/js/js_VmAceQOTHcCqsz-PcMnN_rFOV5_1px_HZuqfPFFpXDo.js?scope=footer&delta=0&language=en&theme=nga&include=eJxdikEKwzAMBD_kRk8Sm1gIFVmCRKV9fhzIpbnsMsOs_pENXYrxxo-3jJIouv91SQttmqkuXFDSOU9eru5fjjYsLHeECh8YTg9e0KdpoSD1XOHtsJKvdWG47EUzrxNl6j3b316ms81ms25ms3rd
https://www.nga.gov/233ms43ms4ms3rd
Unattributable140ms4ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PZ767HM494ms81ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-17453802637&cx=c&gtm=4e64k081ms70ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-GHV9J3QQQ0&cx=c&gtm=4e64k078ms68ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-15686668&cx=c&gtm=4e64k067ms60ms7ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
9 fonts (519 KB)
PASS
9 fonts (519 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

519 KB total

Render-blocking

0

of 9

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 944 ms LCP 7.2 shttps://www.nga.gov/themes/custom/nga/assets/dist/fonts/mallory/MalloryCompact-Book.woffMalloryCompact-Book.woff https://www.nga.gov/themes/custom/nga/assets/dist/fonts/mallory/MalloryCompact-Book.woff — 66.0 KiB — 58 ms — font-display: swaphttps://www.nga.gov/themes/custom/nga/assets/dist/fonts/mallory/MalloryCompact-Medium.woffMalloryCompact-Medium.woff https://www.nga.gov/themes/custom/nga/assets/dist/fonts/mallory/MalloryCompact-Medium.woff — 66.5 KiB — 67 ms — font-display: swaphttps://www.nga.gov/themes/custom/nga/assets/dist/fonts/empirica/EmpiricaHeadBold.woffEmpiricaHeadBold.woff https://www.nga.gov/themes/custom/nga/assets/dist/fonts/empirica/EmpiricaHeadBold.woff — 54.4 KiB — 61 ms — font-display: swaphttps://www.nga.gov/themes/custom/nga/assets/dist/fonts/empirica/EmpiricaHead.woffEmpiricaHead.woff https://www.nga.gov/themes/custom/nga/assets/dist/fonts/empirica/EmpiricaHead.woff — 53.5 KiB — 72 ms — font-display: swaphttps://www.nga.gov/themes/custom/nga/assets/dist/fonts/mallory/MalloryCompact-Bold.woffMalloryCompact-Bold.woff https://www.nga.gov/themes/custom/nga/assets/dist/fonts/mallory/MalloryCompact-Bold.woff — 66.8 KiB — 76 ms — font-display: swaphttps://www.nga.gov/themes/custom/nga/assets/dist/fonts/empirica/EmpiricaHead-Italic.woffEmpiricaHead-Italic.woff https://www.nga.gov/themes/custom/nga/assets/dist/fonts/empirica/EmpiricaHead-Italic.woff — 56.3 KiB — 75 ms — font-display: swaphttps://www.nga.gov/themes/custom/nga/assets/dist/fonts/empirica/EmpiricaHeadMedium.woffEmpiricaHeadMedium.woff https://www.nga.gov/themes/custom/nga/assets/dist/fonts/empirica/EmpiricaHeadMedium.woff — 53.7 KiB — 73 ms — font-display: swaphttps://www.nga.gov/themes/custom/nga/assets/dist/fonts/mallory/MalloryCompact-BookItalic.woffMalloryCompact-BookItal... https://www.nga.gov/themes/custom/nga/assets/dist/fonts/mallory/MalloryCompact-BookItalic.woff — 68.5 KiB — 76 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 66 ms — font-display: swap
MalloryCompact-Book.woff woff swap
Size 66 KB
Load time 58 ms
Start 643 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
MalloryCompact-Medium.woff woff swap
Size 66 KB
Load time 67 ms
Start 643 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
EmpiricaHeadBold.woff woff swap
Size 54 KB
Load time 61 ms
Start 644 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
EmpiricaHead.woff woff swap
Size 53 KB
Load time 72 ms
Start 644 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
MalloryCompact-Bold.woff woff swap
Size 67 KB
Load time 76 ms
Start 645 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
EmpiricaHead-Italic.woff woff swap
Size 56 KB
Load time 75 ms
Start 645 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
EmpiricaHeadMedium.woff woff swap
Size 54 KB
Load time 73 ms
Start 645 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
MalloryCompact-BookItal... woff swap
Size 68 KB
Load time 76 ms
Start 646 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 66 ms
Start 1.3 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)

Fixing the unchecked items could save ~146 KB and ~292 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
89 requests over 2440ms
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 944 ms LCP 7.2 shttps://nga.gov// https://nga.gov/ — 302 — 211 B — 393 ms — http/1.1https://www.nga.gov/www.nga.gov/ https://www.nga.gov/ — 200 — 65.9 KiB — 98 ms — h2https://www.nga.gov/sites/default/files/css/css_wWFugPfJY_GRNK_cR7Z15GVN6xrITlkzYz4_ebY1TMI.css?delta=0&language=en&theme=nga&include=eJxljlFuAyEMRC-E4EjIhCnr1sDK9iZNT182UVUp-Rl5nmzPXKYiVT12kkif9B0uJxhTOwn_IHRUpjTRC2r8OLE7NHQePJVGQzbqkl58pLpIGI1Sk1lIzjE_fmXhoqT3NK9Q5QoLOyk1pX2zvyb_JB5jP4qwbajB2HFbJ5kE6mllejAnXY2-2LNv6EiFDO-0w4zaCrO7Ofpz68q4WXpo7LMegl8YNGorwww.nga.gov/sites/default/files/css... https://www.nga.gov/sites/default/files/css/css_wWFugPfJY_GRNK_cR7Z15GVN6xrITlkzYz4_ebY1TMI.css?delta=0&language=en&theme=nga&include=eJxljlFuAyEMRC-E4EjIhCnr1sDK9iZNT182UVUp-Rl5nmzPXKYiVT12kkif9B0uJxhTOwn_IHRUpjTRC2r8OLE7NHQePJVGQzbqkl58pLpIGI1Sk1lIzjE_fmXhoqT3NK9Q5QoLOyk1pX2zvyb_JB5jP4qwbajB2HFbJ5kE6mllejAnXY2-2LNv6EiFDO-0w4zaCrO7Ofpz68q4WXpo7LMegl8YNGor — 200 — 4.2 KiB — 27 ms — h2https://www.nga.gov/sites/default/files/css/css_Zijb3Y3t5Q8vaxamnfWU73ZbV-ltPNutMmn1Ybm57GY.css?delta=1&language=en&theme=nga&include=eJxljlFuAyEMRC-E4EjIhCnr1sDK9iZNT182UVUp-Rl5nmzPXKYiVT12kkif9B0uJxhTOwn_IHRUpjTRC2r8OLE7NHQePJVGQzbqkl58pLpIGI1Sk1lIzjE_fmXhoqT3NK9Q5QoLOyk1pX2zvyb_JB5jP4qwbajB2HFbJ5kE6mllejAnXY2-2LNv6EiFDO-0w4zaCrO7Ofpz68q4WXpo7LMegl8YNGorwww.nga.gov/sites/default/files/css... https://www.nga.gov/sites/default/files/css/css_Zijb3Y3t5Q8vaxamnfWU73ZbV-ltPNutMmn1Ybm57GY.css?delta=1&language=en&theme=nga&include=eJxljlFuAyEMRC-E4EjIhCnr1sDK9iZNT182UVUp-Rl5nmzPXKYiVT12kkif9B0uJxhTOwn_IHRUpjTRC2r8OLE7NHQePJVGQzbqkl58pLpIGI1Sk1lIzjE_fmXhoqT3NK9Q5QoLOyk1pX2zvyb_JB5jP4qwbajB2HFbJ5kE6mllejAnXY2-2LNv6EiFDO-0w4zaCrO7Ofpz68q4WXpo7LMegl8YNGor — 200 — 60.8 KiB — 33 ms — 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h3https://www.youtube.com/embed/Athdlm8Di9Q?feature=oembed&enablejsapi=1www.youtube.com/embed/Athdlm8Di9Q?f... https://www.youtube.com/embed/Athdlm8Di9Q?feature=oembed&enablejsapi=1 — 200 — 56.5 KiB — 194 ms — h2https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.jswww.youtube.com/s/player/1bb6ee63/w... https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js — 200 — 10.6 KiB — 33 ms — h2https://ad.doubleclick.net/activity;dc_pre=CPS4kq6ogpQDFQnxOwIdPyg4qg;src=15686668;type=allpa0;cat=iaa_n0;rcb=7;ord=3564982744506;npa=1;auiddc=72068018.1776890344;u1=https%3A%2F%2Fwww.nga.gov%2F;u2=www.nga.gov;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;user_data_mode=a;_tu=KFA;gtm=45fe64k0v9227258087z89192709592za20gzb9192709592zd9192709592xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115938466~115938469~117266400~118128922;epver=2;em=tv.1;dc_random=1776890344_I2y8E0uCNZhGCy4t0qGvdQskDCto4doj8A;~oref=https%3A%2F%2Fwww.nga.gov%2F?ad.doubleclick.net/activity;dc_pre=... https://ad.doubleclick.net/activity;dc_pre=CPS4kq6ogpQDFQnxOwIdPyg4qg;src=15686668;type=allpa0;cat=iaa_n0;rcb=7;ord=3564982744506;npa=1;auiddc=72068018.1776890344;u1=https%3A%2F%2Fwww.nga.gov%2F;u2=www.nga.gov;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;user_data_mode=a;_tu=KFA;gtm=45fe64k0v9227258087z89192709592za20gzb9192709592zd9192709592xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115938466~115938469~117266400~118128922;epver=2;em=tv.1;dc_random=1776890344_I2y8E0uCNZhGCy4t0qGvdQskDCto4doj8A;~oref=https%3A%2F%2Fwww.nga.gov%2F? — 200 — 64 B — 117 ms — h3https://adservice.google.com/ddm/fls/z/dc_pre=COvkkK6ogpQDFRk0-wMdB2oiMA;src=15686668;type=allpa0;cat=iaa_n0;rcb=7;ord=3564982744506;npa=1;auiddc=*;u1=https%3A%2F%2Fwww.nga.gov%2F;u2=www.nga.gov;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;user_data_mode=a;_tu=KFA;gtm=45fe64k0v9227258087z89192709592za20gzb9192709592zd9192709592xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938466~115938469~117266400~118128922;epver=2;em=tv.*;dc_random=1776890344_I2y8E0uCNZhGCy4t0qGvdQskDCto4doj8A;_dc_test=1;~oref=https%3A%2F%2Fwww.nga.gov%2Fadservice.google.com/ddm/fls/z/dc_p... https://adservice.google.com/ddm/fls/z/dc_pre=COvkkK6ogpQDFRk0-wMdB2oiMA;src=15686668;type=allpa0;cat=iaa_n0;rcb=7;ord=3564982744506;npa=1;auiddc=*;u1=https%3A%2F%2Fwww.nga.gov%2F;u2=www.nga.gov;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;user_data_mode=a;_tu=KFA;gtm=45fe64k0v9227258087z89192709592za20gzb9192709592zd9192709592xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938466~115938469~117266400~118128922;epver=2;em=tv.*;dc_random=1776890344_I2y8E0uCNZhGCy4t0qGvdQskDCto4doj8A;_dc_test=1;~oref=https%3A%2F%2Fwww.nga.gov%2F — 200 — 63 B — 138 ms — h3https://www.googleadservices.com/pagead/conversion/17453802637/?random=1776890344244&cv=11&fst=1776890344244&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64k0z89192709592za20gzb9192709592zd9192709592xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117884344~118128922&u_w=800&u_h=600&url=https%3A%2F%2Fwww.nga.gov%2F&rcb=13&label=bTxtCJCAjIsbEI3Jz4JB&capi=1&frm=0&tiba=National%20Gallery%20of%20Art&bttype=purchase&value=0&hn=www.googleadservices.com&npa=1&pscdl=noapi&auid=72068018.1776890344&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&fmt=7www.googleadservices.com/pagead/con... https://www.googleadservices.com/pagead/conversion/17453802637/?random=1776890344244&cv=11&fst=1776890344244&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64k0z89192709592za20gzb9192709592zd9192709592xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117884344~118128922&u_w=800&u_h=600&url=https%3A%2F%2Fwww.nga.gov%2F&rcb=13&label=bTxtCJCAjIsbEI3Jz4JB&capi=1&frm=0&tiba=National%20Gallery%20of%20Art&bttype=purchase&value=0&hn=www.googleadservices.com&npa=1&pscdl=noapi&auid=72068018.1776890344&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&fmt=7 — 200 — 1.1 KiB — 58 ms — h3https://www.google.com/ccm/collect?rcb=13&frm=0&en=page_view&dl=https%3A%2F%2Fwww.nga.gov%2F&scrsrc=www.googletagmanager.com&rnd=844345136.1776890344&dt=National%20Gallery%20of%20Art&auid=72068018.1776890344&navt=n&npa=1&gtm=45be64k0z89192709592za20gzb9192709592zd9192709592xec&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117884344~118128922&apve=1&apvf=f&apvc=0&tids=AW-17453802637&tid=AW-17453802637&tft=1776890344252&tfd=1200www.google.com/ccm/collect?rcb=13&f... https://www.google.com/ccm/collect?rcb=13&frm=0&en=page_view&dl=https%3A%2F%2Fwww.nga.gov%2F&scrsrc=www.googletagmanager.com&rnd=844345136.1776890344&dt=National%20Gallery%20of%20Art&auid=72068018.1776890344&navt=n&npa=1&gtm=45be64k0z89192709592za20gzb9192709592zd9192709592xec&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117884344~118128922&apve=1&apvf=f&apvc=0&tids=AW-17453802637&tid=AW-17453802637&tft=1776890344252&tfd=1200 — 200 — 21 B — 25 ms — h3https://www.google.com/ccm/collect?rcb=13&frm=0&ae=g&dl=https%3A%2F%2Fwww.nga.gov%2F&scrsrc=www.googletagmanager.com&rnd=844345136.1776890344&dt=National%20Gallery%20of%20Art&auid=72068018.1776890344&navt=n&npa=1&_tu=CA&gtm=45be64k0z89192709592za20gzb9192709592zd9192709592xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117884344~118128922&apve=1&apvf=f&apvc=0&tids=AW-17453802637&tid=AW-17453802637&tft=1776890344253&tfd=1201www.google.com/ccm/collect?rcb=13&f... https://www.google.com/ccm/collect?rcb=13&frm=0&ae=g&dl=https%3A%2F%2Fwww.nga.gov%2F&scrsrc=www.googletagmanager.com&rnd=844345136.1776890344&dt=National%20Gallery%20of%20Art&auid=72068018.1776890344&navt=n&npa=1&_tu=CA&gtm=45be64k0z89192709592za20gzb9192709592zd9192709592xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117884344~118128922&apve=1&apvf=f&apvc=0&tids=AW-17453802637&tid=AW-17453802637&tft=1776890344253&tfd=1201 — 200 — 21 B — 55 ms — h3https://connect.facebook.net/signals/config/806185425072684?v=2.9.303&r=stable&domain=www.nga.gov&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168connect.facebook.net/signals/config... https://connect.facebook.net/signals/config/806185425072684?v=2.9.303&r=stable&domain=www.nga.gov&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 — 200 — 44.8 KiB — 22 ms — 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https://www.google.es/pagead/1p-conversion/17453802637/?random=294082644&cv=11&fst=1776890344244&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64k0z89192709592za20gzb9192709592zd9192709592xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117884344~118128922&u_w=800&u_h=600&url=https%3A%2F%2Fwww.nga.gov%2F&rcb=13&label=bTxtCJCAjIsbEI3Jz4JB&capi=1&frm=0&tiba=National%20Gallery%20of%20Art&value=0&hn=www.googleadservices.com&npa=1&pscdl=noapi&auid=72068018.1776890344&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&fmt=8&ct_cookie_present=false&crd=CLTesQII8t-xAgit4bECCKG4sQIIscGxAgiwwbECCLHDsQIIisWxAgjCybECCLTGsQIIk9qxAgjb3LECCIfbsQII08WxAgjrzLECCO3OsQII1c-xAgj02rECCJfUsQIIyduxAgix4bECCLPhsQIIpt2xAgiw3rECCIDbsQJKGXRyaWdnZXI7bmF2aWdhdGlvbi1zb3VyY2VaAwoBAWIDCgED&cerd=CgEA&fsk=ChEI8OOhzwYQy-2I0MH1tu65ARIsADfqr1ULkdhLbeZKeEDf3JnV5Sug1X_vQDBhYoyHeLtxZnk2axo9TLooAtcaAjiK&is_vtc=1&cid=CAQSWwAFq6B9GQkStTOiGWCg101_PyUuZh6pANHRjyxRX9vI4WpvI3IUlv2xk04Mq1SPYsigRleOO2qWkzGdnJxq8OFa5C_E6Hv-qWKgQ0jXEhJLL0nHrmYhTr_aO7s&eitems=ChAI8OOhzwYQnf3X0YH146MTEh0AvW1FkUzTfVpBef7gjuuFeuKns7cc0tZg_AeTjg&random=1674636172&ipr=y&pscrd=IhMI5_GarqiClAMVhE_2CB35Ly8LMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOhRodHRwczovL3d3dy5uZ2EuZ292L0JYQ2hFSThPT2h6d1lRMWNpang0LWdsNGFWQVJJdEFJOEVLWjBTM2UySGZUaXZrWUNyczJ2QXc4NHBVNFdVVTdPMGNOa3lPSVNoQzhBWkx0NGt1OFpfTGh6WHoMCAliCAgAEAAYACAA 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h3https://i.ytimg.com/vi/Athdlm8Di9Q/maxresdefault.jpgi.ytimg.com/vi/Athdlm8Di9Q/maxresde... https://i.ytimg.com/vi/Athdlm8Di9Q/maxresdefault.jpg — 200 — 190.2 KiB — 148 ms — h2https://js-agent.newrelic.com/nr-spa-1.313.1.min.jsjs-agent.newrelic.com/nr-spa-1.313.... https://js-agent.newrelic.com/nr-spa-1.313.1.min.js — 200 — 30.3 KiB — 10 ms — h2https://www.nga.gov/cdn-cgi/rum?www.nga.gov/cdn-cgi/rum? https://www.nga.gov/cdn-cgi/rum? — 204 — 172 B — 22 ms — h2https://www.nga.gov/cdn-cgi/rum?www.nga.gov/cdn-cgi/rum? https://www.nga.gov/cdn-cgi/rum? — 204 — 38 B — 22 ms — h2https://www.nga.gov/themes/custom/nga/manifest/favicon.icowww.nga.gov/themes/custom/nga/manif... https://www.nga.gov/themes/custom/nga/manifest/favicon.ico — 200 — 702 B — 26 ms — 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http/1.1https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 23.2 KiB — 61 ms — h3https://www.youtube.com/generate_204?xyHFBQwww.youtube.com/generate_204?xyHFBQ https://www.youtube.com/generate_204?xyHFBQ — 204 — 10 B — 23 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 72 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 32 ms — h2https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — -1 — 0 B — 0 ms —
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 1009ms · 952KB · $13/mo
www.nga.gov
Other
Costly
Execution 316ms
Transfer 263 KB
Unused 72%
Monthly Cost $4/mo
www.nga.gov
Other
Costly
Execution 233ms
Transfer 66 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 140ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 94ms
Transfer 179 KB
Unused 34%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 137 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 176 KB
Unused 34%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 131 KB
Unused 42%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.nga.gov adds 316ms and costs ~$4/month
  • www.nga.gov adds 233ms 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.nga.gov takes 316ms 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

72% of www.nga.gov'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.nga.gov takes 233ms 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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