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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
51
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
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.
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.

4.83 s

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

7.32 s

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

357 ms

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

0.133

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

4.83 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.

9.12 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
17
7 PASS 5 REVIEW 3 FIX
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 (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2263ms total JS execution
FIX
2263ms total JS execution
Warning::
https://www.eia.gov/: 815ms CPU time
Warning::
Unattributable: 388ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NB85...: 270ms CPU time
Info::
https://www.eia.gov/akam/13/24f4aece: 206ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=UA-258...: 199ms CPU time
Warning::
Third-party scripts: 2263ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 22% Style & Layout 21% Script Parsing & Compilation 9% Rendering 7% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.eia.gov/815ms10ms3ms3rd
Unattributable388ms95ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NB85F8V3TS&cx=c&gtm=4e64h1270ms202ms63ms3rd
https://www.eia.gov/akam/13/24f4aece206ms145ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-25837230-1199ms146ms50ms3rd
https://www.eia.gov/global/scripts/global.min.js?v=11.3110ms77ms17ms3rd
https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.min.js85ms49ms35ms3rd
https://www.eia.gov/global/scripts/vendor/jquery/jquery.min.js79ms51ms13ms3rd
https://www.eia.gov/global/styles/global.min.css?v=11.957ms0ms0ms3rd
https://www.google-analytics.com/analytics.js55ms47ms7ms3rd
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
Page Weight Budget
1.1 MB transferred, 64 requests
REVIEW
1.1 MB transferred, 64 requests
Info::
Page weighs 3.2 MB (1.1 MB transferred)
Warning::
JavaScript is 532 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 532 KB
Info::
64 HTTP requests
Info::
Estimated 0.23 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
64 requests
0.23 g CO2 per page load
JavaScript 531.6 KiB 47%
Images 217.7 KiB 19%
CSS 197.5 KiB 18%
Fonts 136.2 KiB 12%
HTML 16.3 KiB 1%
Other 15.7 KiB 1%
Other 10.4 KiB 1%
Other 404 B 0%
0 2.4 MB 4.9 MB
Under budget

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

C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://www.eia.gov/homepage/images/energy-kids/ki... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eia.gov/todayinenergy/images/2026.04.2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 218 KB
0 oversized -0 KB
10 legacy format
2 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

C
JS Bundles
Action
17 scripts, 270 KB unused
REVIEW
17 scripts, 270 KB unused
Warning::
https://www.eia.gov/global/scripts/vendor/jquery-u...: 67 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NB85...: 63 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-258...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eia.gov/global/scripts/jquery/highchar...: 52 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eia.gov/global/scripts/global.min.js?v...: 24 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 270 KB
270 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.min.js76 KB67 KB (89%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NB85F8V3TS&cx=c&gtm=4e64h1156 KB63 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-25837230-1117 KB63 KB (54%)✓3rd
https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts.js59 KB52 KB (89%)✓3rd
https://www.eia.gov/global/scripts/global.min.js?v=11.335 KB24 KB (70%)✓3rd
https://www.eia.gov/global/scripts/jquery/ga/ga-file-downloads.js2 KB—✓3rd
https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/exporting.js4 KB—✓3rd
https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/no-data-to-display.js1 KB—✓3rd
https://www.eia.gov/global/scripts/vendor/jquery/jquery.min.js36 KB—✓3rd
https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts-more.js9 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

B
Page Weight Inventory
64 resources · 1.1 MB · 270 KB savings available
REVIEW
64 resources · 1.1 MB · 270 KB savings available
Warning::
Page weight 102 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~270 KB of savings available
Warning::
63 third-party resources (100% of weight)
64 resources · 1.1 MiB · 63 third-party 101.8 KiB over 1MB target
JavaScript 47% · 531.6 KiB
Image 21% · 233.4 KiB
CSS 18% · 197.5 KiB
Font 12% · 136.2 KiB
Document 2% · 17.2 KiB
Other 1% · 9.9 KiB

~269.6 KiB of savings available

Remove unused JavaScript: 269.6 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (136 KB)
PASS
2 fonts (136 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

136 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.8 s LCP 7.3 shttps://www.eia.gov/global/fonts/Jost-VariableFont_wght.ttfJost-VariableFont_wght.ttf https://www.eia.gov/global/fonts/Jost-VariableFont_wght.ttf — 61.3 KiB — 20 ms — font-display: swaphttps://www.eia.gov/global/fonts/Jost-Italic-VariableFont_wght.ttfJost-Italic-VariableFon... https://www.eia.gov/global/fonts/Jost-Italic-VariableFont_wght.ttf — 74.9 KiB — 20 ms — font-display: swap
Jost-VariableFont_wght.ttf ttf swap
Size 61 KB
Load time 20 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Jost-Italic-VariableFon... ttf swap
Size 75 KB
Load time 20 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~41 KB and ~82 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
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
64 requests over 2210ms
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 4.8 s LCP 7.3 shttps://eia.gov// https://eia.gov/ — 301 — 82 B — 741 ms — h2https://www.eia.gov/www.eia.gov/ https://www.eia.gov/ — 200 — 16.3 KiB — 507 ms — http/1.1https://www.eia.gov/global/styles/global.min.css?v=11.9www.eia.gov/global/styles/global.mi... https://www.eia.gov/global/styles/global.min.css?v=11.9 — 200 — 115.2 KiB — 30 ms — http/1.1https://www.eia.gov/global/scripts/vendor/jquery/jquery.min.jswww.eia.gov/global/scripts/vendor/j... https://www.eia.gov/global/scripts/vendor/jquery/jquery.min.js — 200 — 35.7 KiB — 32 ms — http/1.1https://www.eia.gov/global/scripts/vendor/jquery-migrate/jquery.migrate.min.jswww.eia.gov/global/scripts/vendor/j... https://www.eia.gov/global/scripts/vendor/jquery-migrate/jquery.migrate.min.js — 200 — 3.5 KiB — 27 ms — http/1.1https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.min.jswww.eia.gov/global/scripts/vendor/j... https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.min.js — 200 — 75.6 KiB — 34 ms — http/1.1https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.touch-punch.min.jswww.eia.gov/global/scripts/vendor/j... https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.touch-punch.min.js — 200 — 1.0 KiB — 31 ms — http/1.1https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts.jswww.eia.gov/global/scripts/jquery/h... https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts.js — 200 — 58.9 KiB — 54 ms — http/1.1https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts-more.jswww.eia.gov/global/scripts/jquery/h... https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts-more.js — 200 — 9.0 KiB — 62 ms — http/1.1https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/exporting.jswww.eia.gov/global/scripts/jquery/h... https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/exporting.js — 200 — 3.6 KiB — 42 ms — http/1.1https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/no-data-to-display.jswww.eia.gov/global/scripts/jquery/h... https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/no-data-to-display.js — 200 — 1.1 KiB — 48 ms — http/1.1https://www.eia.gov/global/scripts/jquery/ga/ga-file-downloads.jswww.eia.gov/global/scripts/jquery/g... https://www.eia.gov/global/scripts/jquery/ga/ga-file-downloads.js — 200 — 1.9 KiB — 47 ms — http/1.1https://www.eia.gov/global/styles/global.homepage.min.css?v=1.1www.eia.gov/global/styles/global.ho... https://www.eia.gov/global/styles/global.homepage.min.css?v=1.1 — 200 — 4.3 KiB — 24 ms — http/1.1https://www.eia.gov/global/images/logos/eia_logo_print.pngwww.eia.gov/global/images/logos/eia... https://www.eia.gov/global/images/logos/eia_logo_print.png — 200 — 7.1 KiB — 19 ms — http/1.1https://www.eia.gov/todayinenergy/images/2026.04.21/main.svgwww.eia.gov/todayinenergy/images/20... https://www.eia.gov/todayinenergy/images/2026.04.21/main.svg — 200 — 4.8 KiB — 283 ms — http/1.1https://www.eia.gov/homepage/images/energy-kids/kids-tablet-spring.pngwww.eia.gov/homepage/images/energy-... https://www.eia.gov/homepage/images/energy-kids/kids-tablet-spring.png — 200 — 110.0 KiB — 570 ms — http/1.1https://www.eia.gov/global/scripts/global.min.js?v=11.3www.eia.gov/global/scripts/global.m... https://www.eia.gov/global/scripts/global.min.js?v=11.3 — 200 — 35.2 KiB — 18 ms — http/1.1https://www.eia.gov/global/scripts/global.homepage.min.js?v=1.1www.eia.gov/global/scripts/global.h... https://www.eia.gov/global/scripts/global.homepage.min.js?v=1.1 — 200 — 1.4 KiB — 17 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=UA-25837230-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-25837230-1 — 200 — 116.9 KiB — 38 ms — h2https://www.eia.gov/akam/13/24f4aecewww.eia.gov/akam/13/24f4aece https://www.eia.gov/akam/13/24f4aece — 200 — 9.6 KiB — 167 ms — http/1.1https://www.eia.gov/global/styles/global.print.min.csswww.eia.gov/global/styles/global.pr... https://www.eia.gov/global/styles/global.print.min.css — 200 — 78.0 KiB — 20 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 93.83 75.33…www.w3.org/2000/svg' viewBox='0 0 9... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 93.83 75.33… — 200 — 0 B — 1 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 25 25'%3E%3…www.w3.org/2000/svg' viewBox='0 0 2... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 25 25'%3E%3… — 200 — 0 B — 0 ms — datahttps://www.eia.gov/global/images/energy-kids/energy-ant.pngwww.eia.gov/global/images/energy-ki... https://www.eia.gov/global/images/energy-kids/energy-ant.png — 200 — 46.1 KiB — 16 ms — http/1.1https://www.eia.gov/global/scripts/search.usa.gov/remote.loader.jswww.eia.gov/global/scripts/search.u... https://www.eia.gov/global/scripts/search.usa.gov/remote.loader.js — 200 — 1.2 KiB — 13 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 42'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 42'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 42'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 42'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 44'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 44'%3E%3… — 200 — 0 B — 0 ms — data
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.8 s LCP 7.3 shttps://eia.gov// https://eia.gov/ — 301 — 82 B — 741 ms — h2https://www.eia.gov/www.eia.gov/ https://www.eia.gov/ — 200 — 16.3 KiB — 507 ms — http/1.1https://www.eia.gov/global/styles/global.min.css?v=11.9www.eia.gov/global/styles/global.mi... https://www.eia.gov/global/styles/global.min.css?v=11.9 — 200 — 115.2 KiB — 30 ms — http/1.1https://www.eia.gov/global/scripts/vendor/jquery/jquery.min.jswww.eia.gov/global/scripts/vendor/j... https://www.eia.gov/global/scripts/vendor/jquery/jquery.min.js — 200 — 35.7 KiB — 32 ms — http/1.1https://www.eia.gov/global/scripts/vendor/jquery-migrate/jquery.migrate.min.jswww.eia.gov/global/scripts/vendor/j... https://www.eia.gov/global/scripts/vendor/jquery-migrate/jquery.migrate.min.js — 200 — 3.5 KiB — 27 ms — http/1.1https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.min.jswww.eia.gov/global/scripts/vendor/j... https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.min.js — 200 — 75.6 KiB — 34 ms — http/1.1https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.touch-punch.min.jswww.eia.gov/global/scripts/vendor/j... https://www.eia.gov/global/scripts/vendor/jquery-ui/jquery.ui.touch-punch.min.js — 200 — 1.0 KiB — 31 ms — http/1.1https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts.jswww.eia.gov/global/scripts/jquery/h... https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts.js — 200 — 58.9 KiB — 54 ms — http/1.1https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts-more.jswww.eia.gov/global/scripts/jquery/h... https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/highcharts-more.js — 200 — 9.0 KiB — 62 ms — http/1.1https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/exporting.jswww.eia.gov/global/scripts/jquery/h... https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/exporting.js — 200 — 3.6 KiB — 42 ms — http/1.1https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/no-data-to-display.jswww.eia.gov/global/scripts/jquery/h... https://www.eia.gov/global/scripts/jquery/highcharts/3.0.10/js/modules/no-data-to-display.js — 200 — 1.1 KiB — 48 ms — http/1.1https://www.eia.gov/global/scripts/jquery/ga/ga-file-downloads.jswww.eia.gov/global/scripts/jquery/g... https://www.eia.gov/global/scripts/jquery/ga/ga-file-downloads.js — 200 — 1.9 KiB — 47 ms — http/1.1https://www.eia.gov/global/styles/global.homepage.min.css?v=1.1www.eia.gov/global/styles/global.ho... https://www.eia.gov/global/styles/global.homepage.min.css?v=1.1 — 200 — 4.3 KiB — 24 ms — http/1.1https://www.eia.gov/global/images/logos/eia_logo_print.pngwww.eia.gov/global/images/logos/eia... https://www.eia.gov/global/images/logos/eia_logo_print.png — 200 — 7.1 KiB — 19 ms — http/1.1https://www.eia.gov/todayinenergy/images/2026.04.21/main.svgwww.eia.gov/todayinenergy/images/20... https://www.eia.gov/todayinenergy/images/2026.04.21/main.svg — 200 — 4.8 KiB — 283 ms — http/1.1https://www.eia.gov/homepage/images/energy-kids/kids-tablet-spring.pngwww.eia.gov/homepage/images/energy-... https://www.eia.gov/homepage/images/energy-kids/kids-tablet-spring.png — 200 — 110.0 KiB — 570 ms — http/1.1https://www.eia.gov/global/scripts/global.min.js?v=11.3www.eia.gov/global/scripts/global.m... https://www.eia.gov/global/scripts/global.min.js?v=11.3 — 200 — 35.2 KiB — 18 ms — http/1.1https://www.eia.gov/global/scripts/global.homepage.min.js?v=1.1www.eia.gov/global/scripts/global.h... https://www.eia.gov/global/scripts/global.homepage.min.js?v=1.1 — 200 — 1.4 KiB — 17 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=UA-25837230-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-25837230-1 — 200 — 116.9 KiB — 38 ms — 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data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 93.83 75.33… — 200 — 0 B — 1 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 25 25'%3E%3…www.w3.org/2000/svg' viewBox='0 0 2... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 25 25'%3E%3… — 200 — 0 B — 0 ms — datahttps://www.eia.gov/global/images/energy-kids/energy-ant.pngwww.eia.gov/global/images/energy-ki... https://www.eia.gov/global/images/energy-kids/energy-ant.png — 200 — 46.1 KiB — 16 ms — http/1.1https://www.eia.gov/global/scripts/search.usa.gov/remote.loader.jswww.eia.gov/global/scripts/search.u... https://www.eia.gov/global/scripts/search.usa.gov/remote.loader.js — 200 — 1.2 KiB — 13 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 42'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg 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40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datahttps://www.eia.gov/global/images/interactive/crude_import_tool.pngwww.eia.gov/global/images/interacti... https://www.eia.gov/global/images/interactive/crude_import_tool.png — 200 — 2.8 KiB — 16 ms — http/1.1https://www.eia.gov/global/images/interactive/api.pngwww.eia.gov/global/images/interacti... https://www.eia.gov/global/images/interactive/api.png — 200 — 1.8 KiB — 16 ms — http/1.1https://www.eia.gov/global/images/interactive/steo.pngwww.eia.gov/global/images/interacti... https://www.eia.gov/global/images/interactive/steo.png — 200 — 3.5 KiB — 15 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 14'%3E%3C…www.w3.org/2000/svg' viewBox='0 0 8... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 14'%3E%3C… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 13.92 13.92…www.w3.org/2000/svg' viewBox='0 0 1... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 13.92 13.92… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3…www.w3.org/2000/svg' viewBox='0 0 4... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 40'%3E%3… — 200 — 0 B — 0 ms — datahttps://www.eia.gov/global/images/interactive/totalenergy_mer.pngwww.eia.gov/global/images/interacti... https://www.eia.gov/global/images/interactive/totalenergy_mer.png — 200 — 12.2 KiB — 15 ms — http/1.1https://www.eia.gov/global/images/interactive/us.pngwww.eia.gov/global/images/interacti... https://www.eia.gov/global/images/interactive/us.png — 200 — 3.5 KiB — 11 ms — http/1.1https://www.eia.gov/global/images/interactive/atlas.pngwww.eia.gov/global/images/interacti... https://www.eia.gov/global/images/interactive/atlas.png — 200 — 26.1 KiB — 17 ms — http/1.1https://www.eia.gov/global/fonts/Jost-VariableFont_wght.ttfwww.eia.gov/global/fonts/Jost-Varia... https://www.eia.gov/global/fonts/Jost-VariableFont_wght.ttf — 200 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h2https://www.google-analytics.com/g/collect?v=2&tid=G-NB85F8V3TS&gtm=45je64h1v877595518za20g&_p=1776802261235&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAI&are=1&cid=1981126181.1776802262&frm=0&pscdl=noapi&rcb=9&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=0~115938465~115938468~117266400~117384405&sid=1776802261&sct=1&seg=0&dl=https%3A%2F%2Fwww.eia.gov%2F&dt=Homepage%20-%20U.S.%20Energy%20Information%20Administration%20(EIA)&en=page_view&_fv=1&_ss=1&_c=1&tfd=1814www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-NB85F8V3TS&gtm=45je64h1v877595518za20g&_p=1776802261235&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAI&are=1&cid=1981126181.1776802262&frm=0&pscdl=noapi&rcb=9&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=0~115938465~115938468~117266400~117384405&sid=1776802261&sct=1&seg=0&dl=https%3A%2F%2Fwww.eia.gov%2F&dt=Homepage%20-%20U.S.%20Energy%20Information%20Administration%20(EIA)&en=page_view&_fv=1&_ss=1&_c=1&tfd=1814 — 204 — 404 B — 10 ms — h2https://www.eia.gov/akam/13/pixel_24f4aecewww.eia.gov/akam/13/pixel_24f4aece https://www.eia.gov/akam/13/pixel_24f4aece — 200 — 858 B — 8 ms — http/1.1https://www.eia.gov/favicon.icowww.eia.gov/favicon.ico https://www.eia.gov/favicon.ico — 200 — 15.7 KiB — 11 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 2263ms · 581KB · $30/mo
www.eia.gov
Other
Costly
Execution 815ms
Transfer 16 KB
Monthly Cost $11/mo
Unattributable
Other
Costly
Execution 388ms
Transfer 0 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 270ms
Transfer 156 KB
Unused 40%
Monthly Cost $4/mo
www.eia.gov
Other
Costly
Execution 206ms
Transfer 10 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 199ms
Transfer 117 KB
Unused 54%
Monthly Cost $3/mo
www.eia.gov
Other
Optional
Execution 110ms
Transfer 35 KB
Unused 70%
Monthly Cost $1/mo
www.eia.gov
Other
Optional
Execution 85ms
Transfer 76 KB
Unused 89%
Monthly Cost $1/mo
www.eia.gov
Other
Optional
Execution 79ms
Transfer 36 KB
Monthly Cost $1/mo
www.eia.gov
Other
Optional
Execution 57ms
Transfer 115 KB
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 55ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.eia.gov adds 815ms and costs ~$11/month
  • Unattributable adds 388ms and costs ~$5/month
  • Google Tag Manager adds 270ms and costs ~$4/month
  • www.eia.gov adds 206ms 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.eia.gov takes 815ms 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 388ms 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 270ms 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.eia.gov takes 206ms 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

54% of Google Tag Manager'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

70% of www.eia.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

89% of www.eia.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

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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