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Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
7
PASS
9
INFO
4

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

Mobile Desktop
83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

1.03 s

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

2.50 s

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

107 ms

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

0.002

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

1.25 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.

2.52 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
23
9 PASS 7 REVIEW 3 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 41 requests
FIX
2.3 MB transferred, 41 requests
Info::
Page weighs 4.5 MB (2.3 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
41 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
41 requests
0.48 g CO2 per page load
JavaScript 1.1 MiB 46%
Images 1014.1 KiB 43%
Fonts 73.7 KiB 3%
Other 66.5 KiB 3%
HTML 57.6 KiB 2%
CSS 42.4 KiB 2%
Other 1.1 KiB 0%
Other 552 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

D
JS Bundles
Action
9 scripts, 310 KB unused
FIX
9 scripts, 310 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 108 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://bea.gov/sites/default/files/js/js_I61q1dFT...: 74 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-J469...: 64 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 310 KB
310 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e66h0149 KB108 KB (72%)✓3rd
https://bea.gov/sites/default/files/js/js_I61q1dFTr3aRUs0_s4aDnPq-d6U8vrlwMep4qWNX6aE.js?scope=footer&delta=0&language=en&theme=beagov_theme&include=eJx9jVEKwzAMQy-UJkcKDvVSb25sYi_tbr8yxsjXfoSkB1JBqDKyb7hjWsFhcSiMFsoMKksBXsxfTK2GIuLmHTT9XNaOmRr5BFVUBvapcRF20oCnX0OPtPanAsdvDDdpDgeaXJeTjzbqPxZtoz0MwsPSRyPc4XwD7glWYg104 KB74 KB (72%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L149 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-J4698JNNFT164 KB64 KB (39%)✓3rd
https://use.fontawesome.com/releases/v6.4.2/js/all.js496 KB—✓3rd
https://use.fontawesome.com/releases/v6.4.2/js/v4-shims.js9 KB—✓3rd
https://search.bea.gov/javascripts/remote.loader.js0 KB—✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOC&subagency=BEA9 KB—✓3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js5 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

D
Page Weight Inventory
Action
41 resources · 2.3 MB · 310 KB savings available
FIX
41 resources · 2.3 MB · 310 KB savings available
Warning::
Page weight 2.3 MB exceeds 1 MB target by 1.3 MB
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~310 KB of savings available
Warning::
16 third-party resources (44% of weight)
Info::
1 resources over 200KB
41 resources · 2.3 MiB · 16 third-party 1.3 MiB over 1MB target
JavaScript 46% · 1.1 MiB
Image 46% · 1.1 MiB
Font 3% · 73.7 KiB
Document 2% · 57.6 KiB
CSS 2% · 42.4 KiB
Other 0% · 1.6 KiB

~310.5 KiB of savings available

Remove unused JavaScript: 310.5 KiB
B
Third-Party Impact
44% third-party, 0 ms blocking
REVIEW
44% third-party, 0 ms blocking
Info::
Third-party code accounts for 44% of page weight (1.0 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
56%
44%
First-party Third-party
C
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://bea.gov/sites/default/files/capitol-dome.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bea.gov/sites/default/files/favicon-57.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bea.gov/sites/default/files/survey.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bea.gov/sites/default/files/keyboard-newsp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bea.gov/sites/default/files/code-view.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 1014 KB
0 oversized -0 KB
18 legacy format
5 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

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

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

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

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

B
JS Execution Cost
788ms total JS execution
REVIEW
788ms total JS execution
Info::
https://bea.gov/: 231ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-J469...: 173ms CPU time
Info::
Unattributable: 125ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 93ms CPU time
Info::
https://use.fontawesome.com/releases/v6.4.2/js/all...: 87ms CPU time
Info::
Third-party scripts: 352ms (45% of total)

Main Thread Breakdown

Script Evaluation 39% Style & Layout 22% Script Parsing & Compilation 18% Other 14%
ScriptTotalScriptingParse/CompileParty
https://bea.gov/231ms2ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-J4698JNNFT173ms137ms34ms3rd
Unattributable125ms3ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L93ms74ms18ms3rd
https://use.fontawesome.com/releases/v6.4.2/js/all.js87ms19ms67ms3rd
https://bea.gov/sites/default/files/js/js_I61q1dFTr3aRUs0_s4aDnPq-d6U8vrlwMep4qWNX6aE.js?scope=footer&delta=0&language=en&theme=beagov_theme&include=eJx9jVEKwzAMQy-UJkcKDvVSb25sYi_tbr8yxsjXfoSkB1JBqDKyb7hjWsFhcSiMFsoMKksBXsxfTK2GIuLmHTT9XNaOmRr5BFVUBvapcRF20oCnX0OPtPanAsdvDDdpDgeaXJeTjzbqPxZtoz0MwsPSRyPc4XwD7glWYg80ms54ms23ms1st
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
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 (74 KB)
PASS
5 fonts (74 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

74 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.5 shttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2S6u9w4BMUTPHh6UVSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 13.9 KiB — 14 ms — font-display: swaphttps://bea.gov/themes/custom/beagov_theme/bootstrap/assets/fonts/bootstrap/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://bea.gov/themes/custom/beagov_theme/bootstrap/assets/fonts/bootstrap/glyphicons-halflings-regular.woff2 — 18.0 KiB — 305 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2S6u9w4BMUTPHh7USSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2 — 13.6 KiB — 19 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u8w4BMUTPHjxsAXC-qNiXg7Q.woff2S6u8w4BMUTPHjxsAXC-qNiX... https://fonts.gstatic.com/s/lato/v25/S6u8w4BMUTPHjxsAXC-qNiXg7Q.woff2 — 14.5 KiB — 21 ms — font-display: swap
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 13 ms
Start 823 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh6UVSwiPGQ3... woff2 swap
Size 14 KB
Load time 14 ms
Start 824 ms
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 305 ms
Start 824 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh7USSwiPGQ3... woff2 swap
Size 14 KB
Load time 19 ms
Start 824 ms
Risk FOUT — text flashes from fallback to web font
S6u8w4BMUTPHjxsAXC-qNiX... woff2 swap
Size 15 KB
Load time 21 ms
Start 825 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)
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
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=60 (≤ 5min) is appropriate
PASS
Main HTML max-age=60 (≤ 5min) is appropriate
Info::
Main HTML max-age=60 (≤ 5min) is appropriate
Got: max-age=60, public
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Cookie,X-Consumer-ID
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A+
HTTP Caching
max-age=60 (1 minute)
PASS
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: max-age=60, public
Info::
Effective TTL: 1 minute (max-age=60)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=60, public

DirectiveValueMeaning
max-age60Cache for 1 minute
public—Any cache may store this response
Effective TTL: 60 seconds
Network Waterfall
41 requests over 1745ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.5 shttps://bea.gov// https://bea.gov/ — 200 — 57.6 KiB — 419 ms — h2https://bea.gov/sites/default/files/css/css_r8z1CNRC609IjmdlQf0ZC0tOrL155aoOFOtteZcU5pI.css?delta=0&language=en&theme=beagov_theme&include=eJxdi9EOgkAMBH-ocJ9ktrKeaI8aWhD-XmI0Mb5sMjNZJaqvp7yysQxIdAk1huhvuPiUf6qaK6yL3G2cqpx9Pv7z8oD1uGETbnmE-9d9UGKPZCuKoKwjn1He2zcfFuMLXIQ3Hw/sites/default/files/css/css_r8z1CN... https://bea.gov/sites/default/files/css/css_r8z1CNRC609IjmdlQf0ZC0tOrL155aoOFOtteZcU5pI.css?delta=0&language=en&theme=beagov_theme&include=eJxdi9EOgkAMBH-ocJ9ktrKeaI8aWhD-XmI0Mb5sMjNZJaqvp7yysQxIdAk1huhvuPiUf6qaK6yL3G2cqpx9Pv7z8oD1uGETbnmE-9d9UGKPZCuKoKwjn1He2zcfFuMLXIQ3Hw — 200 — 2.2 KiB — 288 ms — h2https://bea.gov/sites/default/files/css/css_7eQ37UuGTyEyyV8DHE6uL2lQBdvUvH-HkY4M1Y-CJwI.css?delta=1&language=en&theme=beagov_theme&include=eJxdi9EOgkAMBH-ocJ9ktrKeaI8aWhD-XmI0Mb5sMjNZJaqvp7yysQxIdAk1huhvuPiUf6qaK6yL3G2cqpx9Pv7z8oD1uGETbnmE-9d9UGKPZCuKoKwjn1He2zcfFuMLXIQ3Hw/sites/default/files/css/css_7eQ37U... https://bea.gov/sites/default/files/css/css_7eQ37UuGTyEyyV8DHE6uL2lQBdvUvH-HkY4M1Y-CJwI.css?delta=1&language=en&theme=beagov_theme&include=eJxdi9EOgkAMBH-ocJ9ktrKeaI8aWhD-XmI0Mb5sMjNZJaqvp7yysQxIdAk1huhvuPiUf6qaK6yL3G2cqpx9Pv7z8oD1uGETbnmE-9d9UGKPZCuKoKwjn1He2zcfFuMLXIQ3Hw — 200 — 2.5 KiB — 272 ms — h2https://fonts.googleapis.com/css?family=Lato:300,400,400i,700fonts.googleapis.com/css?family=Lat... https://fonts.googleapis.com/css?family=Lato:300,400,400i,700 — 200 — 948 B — 54 ms — h2https://bea.gov/sites/default/files/css/css_ChAnK4gHi4RVTwzIgrTqzQ7ZKZx3XxAx-GBz7xhKk6Q.css?delta=3&language=en&theme=beagov_theme&include=eJxdi9EOgkAMBH-ocJ9ktrKeaI8aWhD-XmI0Mb5sMjNZJaqvp7yysQxIdAk1huhvuPiUf6qaK6yL3G2cqpx9Pv7z8oD1uGETbnmE-9d9UGKPZCuKoKwjn1He2zcfFuMLXIQ3Hw/sites/default/files/css/css_ChAnK4... https://bea.gov/sites/default/files/css/css_ChAnK4gHi4RVTwzIgrTqzQ7ZKZx3XxAx-GBz7xhKk6Q.css?delta=3&language=en&theme=beagov_theme&include=eJxdi9EOgkAMBH-ocJ9ktrKeaI8aWhD-XmI0Mb5sMjNZJaqvp7yysQxIdAk1huhvuPiUf6qaK6yL3G2cqpx9Pv7z8oD1uGETbnmE-9d9UGKPZCuKoKwjn1He2zcfFuMLXIQ3Hw — 200 — 36.7 KiB — 325 ms — h2https://bea.gov/sites/default/files/favicon-57.png/sites/default/files/favicon-57.png https://bea.gov/sites/default/files/favicon-57.png — 200 — 963 B — 268 ms — h2https://bea.gov/system/files/0626-Chart.png/system/files/0626-Chart.png https://bea.gov/system/files/0626-Chart.png — 200 — 129.6 KiB — 515 ms — h2https://bea.gov/sites/default/files/survey.png/sites/default/files/survey.png https://bea.gov/sites/default/files/survey.png — 200 — 93.7 KiB — 213 ms — h2https://bea.gov/sites/default/files/keyboard-newspaper.png/sites/default/files/keyboard-newsp... https://bea.gov/sites/default/files/keyboard-newspaper.png — 200 — 126.7 KiB — 176 ms — h2https://bea.gov/sites/default/files/capitol-dome.png/sites/default/files/capitol-dome.p... https://bea.gov/sites/default/files/capitol-dome.png — 200 — 154.7 KiB — 211 ms — h2https://bea.gov/sites/default/files/js/js_I61q1dFTr3aRUs0_s4aDnPq-d6U8vrlwMep4qWNX6aE.js?scope=footer&delta=0&language=en&theme=beagov_theme&include=eJx9jVEKwzAMQy-UJkcKDvVSb25sYi_tbr8yxsjXfoSkB1JBqDKyb7hjWsFhcSiMFsoMKksBXsxfTK2GIuLmHTT9XNaOmRr5BFVUBvapcRF20oCnX0OPtPanAsdvDDdpDgeaXJeTjzbqPxZtoz0MwsPSRyPc4XwD7glWYg/sites/default/files/js/js_I61q1dFT... https://bea.gov/sites/default/files/js/js_I61q1dFTr3aRUs0_s4aDnPq-d6U8vrlwMep4qWNX6aE.js?scope=footer&delta=0&language=en&theme=beagov_theme&include=eJx9jVEKwzAMQy-UJkcKDvVSb25sYi_tbr8yxsjXfoSkB1JBqDKyb7hjWsFhcSiMFsoMKksBXsxfTK2GIuLmHTT9XNaOmRr5BFVUBvapcRF20oCnX0OPtPanAsdvDDdpDgeaXJeTjzbqPxZtoz0MwsPSRyPc4XwD7glWYg — 200 — 103.9 KiB — 236 ms — h2https://use.fontawesome.com/releases/v6.4.2/js/all.jsuse.fontawesome.com/releases/v6.4.2... https://use.fontawesome.com/releases/v6.4.2/js/all.js — 200 — 496.0 KiB — 89 ms — h2https://use.fontawesome.com/releases/v6.4.2/js/v4-shims.jsuse.fontawesome.com/releases/v6.4.2... https://use.fontawesome.com/releases/v6.4.2/js/v4-shims.js — 200 — 8.8 KiB — 43 ms — h2https://search.bea.gov/javascripts/remote.loader.jssearch.bea.gov/javascripts/remote.l... https://search.bea.gov/javascripts/remote.loader.js — -1 — 0 B — 160 ms — https://www.googletagmanager.com/gtag/js?id=G-J4698JNNFTwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-J4698JNNFT — 200 — 164.1 KiB — 92 ms — h2https://bea.gov/sites/default/files/code-view.png/sites/default/files/code-view.png https://bea.gov/sites/default/files/code-view.png — 200 — 119.9 KiB — 240 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOC&subagency=BEAdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOC&subagency=BEA — 200 — 9.4 KiB — 30 ms — h3https://bea.gov/sites/default/files/bea-logo-full-horz.svg/sites/default/files/bea-logo-full-... https://bea.gov/sites/default/files/bea-logo-full-horz.svg — 200 — 119.4 KiB — 442 ms — h2https://bea.gov/sites/default/files/bullet-orange.png/sites/default/files/bullet-orange.... https://bea.gov/sites/default/files/bullet-orange.png — 200 — 18.2 KiB — 294 ms — h2https://bea.gov/sites/default/files/logo-x-600-blue-dark.png/sites/default/files/logo-x-600-blu... 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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
45% of JavaScript execution is third-party
First-party Third-party 352ms · 809KB · $5/mo
Google Tag Manager
Tag Manager
Optional
Execution 173ms
Transfer 164 KB
Unused 39%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 93ms
Transfer 149 KB
Unused 43%
Monthly Cost $1/mo
use.fontawesome.com
Other
Optional
Execution 87ms
Transfer 496 KB
Monthly Cost $1/mo

45% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

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Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-05-25 — 2026-06-21)

LCP (p75)

1966 ms

83% good

INP (p75)

0 ms

0% good

CLS (p75)

0.010

99% good

FCP (p75)

1690 ms

TTFB (p75)

959 ms

Image Optimization
7 images, 750 KB total, 460 KB wasted
INFO

Image Optimization Audit

Total Images

7

Total Size

750 KB

Oversized

5

Wasted

460 KB

1 missing alt text 6 missing dimensions 5 missing lazy loading
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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