Skip to content
https://eia.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
2
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
79
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.

1.91 s

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

2.13 s

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

24 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.

1.91 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.

2.53 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
15
6 PASS 5 REVIEW 2 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
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 220.7 KiB 20%
CSS 197.5 KiB 18%
Fonts 136.2 KiB 12%
HTML 16.3 KiB 1%
Other 15.1 KiB 1%
Other 9.8 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/todayinenergy/images/2026.04.2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
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.
19 images 221 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 104 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 103.6 KiB over 1MB target
JavaScript 47% · 531.6 KiB
Image 21% · 235.8 KiB
CSS 18% · 197.5 KiB
Font 12% · 136.2 KiB
Document 2% · 17.2 KiB
Other 1% · 9.3 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+
JS Execution Cost
313ms total JS execution
PASS
313ms total JS execution
Info::
https://www.eia.gov/global/scripts/global.min.js?v...: 150ms CPU time
Info::
Unattributable: 97ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-NB85...: 67ms CPU time
Warning::
Third-party scripts: 313ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Style & Layout 22% Other 18% Script Parsing & Compilation 10% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.eia.gov/global/scripts/global.min.js?v=11.3150ms25ms4ms3rd
Unattributable97ms23ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NB85F8V3TS&cx=c&gtm=4e64h167ms50ms16ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.9 s LCP 2.1 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 — 26 ms — font-display: swap
Jost-VariableFont_wght.ttf ttf swap
Size 61 KB
Load time 20 ms
Start 1.4 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 26 ms
Start 1.4 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
Network Waterfall
64 requests over 2011ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.9 s LCP 2.1 shttps://eia.gov// https://eia.gov/ — 301 — 82 B — 762 ms — h2https://www.eia.gov/www.eia.gov/ https://www.eia.gov/ — 200 — 16.3 KiB — 318 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 — 33 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 — 53 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 — 28 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 — 61 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 — 58 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 — 57 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 — 60 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 — 55 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 — 63 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 — 23 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 — 14 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 — 14 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 — 280 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 — 15 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 — 12 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 — 37 ms — h2https://www.eia.gov/akam/13/24f4aecewww.eia.gov/akam/13/24f4aece https://www.eia.gov/akam/13/24f4aece — 200 — 9.6 KiB — 8 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 — 32 ms — http/1.1https://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 — 30 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 — 32 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 0 302 101'%3E…www.w3.org/2000/svg' viewBox='0 0 3... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 302 101'%3E… — 200 — 0 B — 0 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 — 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 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.9 s LCP 2.1 shttps://eia.gov// https://eia.gov/ — 301 — 82 B — 762 ms — h2https://www.eia.gov/www.eia.gov/ https://www.eia.gov/ — 200 — 16.3 KiB — 318 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 — 33 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 — 53 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 — 28 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 — 61 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 — 58 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 — 57 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 — 60 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 — 55 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 — 63 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 — 23 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 — 14 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 — 14 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 — 280 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 — 15 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 — 12 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 — 37 ms — h2https://www.eia.gov/akam/13/24f4aecewww.eia.gov/akam/13/24f4aece https://www.eia.gov/akam/13/24f4aece — 200 — 9.6 KiB — 8 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 — 32 ms — http/1.1https://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 — 30 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 — 32 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 0 302 101'%3E…www.w3.org/2000/svg' viewBox='0 0 3... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 302 101'%3E… — 200 — 0 B — 0 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 — 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 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 — 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 — 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 — 3.4 KiB — 13 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 — 2.4 KiB — 20 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 — 4.1 KiB — 26 ms — http/1.1https://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 — 12.8 KiB — 13 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 — 4.1 KiB — 32 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 — datahttps://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 — 38 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 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/includes/bookshelf/index.phpwww.eia.gov/global/includes/bookshe... https://www.eia.gov/global/includes/bookshelf/index.php — 200 — 4.5 KiB — 333 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 — 61.3 KiB — 20 ms — http/1.1https://www.eia.gov/global/fonts/Jost-Italic-VariableFont_wght.ttfwww.eia.gov/global/fonts/Jost-Itali... https://www.eia.gov/global/fonts/Jost-Italic-VariableFont_wght.ttf — 200 — 74.9 KiB — 26 ms — http/1.1https://www.eia.gov/global/includes/bookshelf/index.phpwww.eia.gov/global/includes/bookshe... https://www.eia.gov/global/includes/bookshelf/index.php — 200 — 4.5 KiB — 601 ms — http/1.1https://search.usa.gov/assets/sayt.csssearch.usa.gov/assets/sayt.css https://search.usa.gov/assets/sayt.css — -1 — 0 B — 430 ms — https://search.usa.gov/assets/sayt_loader_libs.jssearch.usa.gov/assets/sayt_loader_l... https://search.usa.gov/assets/sayt_loader_libs.js — -1 — 0 B — 432 ms — data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAQAElEQVR4AeycCZhUxbXHT3UPMwg4q…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASwAAACWCAYAAABkW7XSAAAQAElEQVR4AeycCZhUxbXHT3UPMwg4q… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACGFjVEwAAAABAAAAAcMq2TYAAAANS…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACGFjVEwAAAABAAAAAcMq2TYAAAANS… — 200 — 0 B — 0 ms — datahttps://www.googletagmanager.com/gtag/js?id=G-NB85F8V3TS&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-NB85F8V3TS&cx=c&gtm=4e64h1 — 200 — 156.1 KiB — 27 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 24 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-NB85F8V3TS&gtm=45je64h1v877595518za20g&_p=1776802278203&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAI&are=1&cid=1441681920.1776802279&frm=0&pscdl=noapi&rcb=9&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400&sid=1776802278&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=1667www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-NB85F8V3TS&gtm=45je64h1v877595518za20g&_p=1776802278203&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAI&are=1&cid=1441681920.1776802279&frm=0&pscdl=noapi&rcb=9&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400&sid=1776802278&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=1667 — 204 — 404 B — 9 ms — h2https://www.eia.gov/favicon.icowww.eia.gov/favicon.ico https://www.eia.gov/favicon.ico — 200 — 15.0 KiB — 11 ms — http/1.1https://www.eia.gov/akam/13/pixel_24f4aecewww.eia.gov/akam/13/pixel_24f4aece https://www.eia.gov/akam/13/pixel_24f4aece — 200 — 858 B — 9 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 313ms · 191KB · $4/mo
www.eia.gov
Other
Optional
Execution 150ms
Transfer 35 KB
Unused 70%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 97ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 156 KB
Unused 40%
Monthly Cost $1/mo

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

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

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.

Send Feedback