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https://energystar.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
78
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.17 s

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

3.23 s

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

45 ms

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

0.003

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

1.51 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.24 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 3 REVIEW 4 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
10 scripts, 413 KB unused
FIX
10 scripts, 413 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 106 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S0KJ...: 69 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2SEC...: 62 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-L8Z...: 58 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 413 KB
413 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S0KJTVVLQ6&cx=c&gtm=4e64h1169 KB69 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h1156 KB62 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-L8ZB147 KB58 KB (39%)✓3rd
https://www.energystar.gov/sites/default/files/js/js_XC8Ovo4gpHwpZBEIWO-L_MDsixMp9etwdDyvVPn94fU.js?scope=footer&delta=0&language=en&theme=gesso&include=eJxdjVEKgDAMQy8k7kijc3UUZzu66tjtFZ0_QiDkBRJgoyDm4PV5Fd2nhLWKg4xqPgAz6kABls2b3CqDRJUSpbHfkY_BUpYA-QtyovLd_qZar9R6mioZNoronztHTHYB5Zw6YQ67 KB56 KB (84%)✓3rd
https://www.energystar.gov/sites/default/files/google_tag/epa/google_tag.script.js?tdfrgb1 KB—✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=EPA9 KB—✓3rd
https://script.crazyegg.com/pages/scripts/0005/9240.js0 KB—✓3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js4 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
51 resources · 1.7 MB · 413 KB savings available
FIX
51 resources · 1.7 MB · 413 KB savings available
Warning::
Page weight 737 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~413 KB of savings available
Warning::
50 third-party resources (100% of weight)
51 resources · 1.7 MiB · 50 third-party 737.4 KiB over 1MB target
JavaScript 48% · 849.0 KiB
Font 32% · 558.3 KiB
Image 18% · 313.4 KiB
CSS 2% · 29.2 KiB
Document 1% · 9.1 KiB
Other 0% · 2.4 KiB

~413.3 KiB of savings available

Remove unused JavaScript: 413.3 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Page Weight Budget
Action
1.7 MB transferred, 51 requests
REVIEW
1.7 MB transferred, 51 requests
Info::
Page weighs 3.5 MB (1.7 MB transferred)
Warning::
JavaScript is 849 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 849 KB
Info::
Fonts are 558 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 558 KB
Info::
51 HTTP requests
Info::
Estimated 0.36 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
51 requests
0.36 g CO2 per page load
JavaScript 849.0 KiB 48%
Fonts 558.3 KiB 32%
Images 294.1 KiB 17%
CSS 29.2 KiB 2%
Other 19.6 KiB 1%
HTML 8.9 KiB 1%
Other 1.9 KiB 0%
Other 550 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

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

B
Image Optimization
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 294 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
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
386ms total JS execution
PASS
386ms total JS execution
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-L8Z...: 94ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-S0KJ...: 82ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 73ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-2SEC...: 71ms CPU time
Info::
Unattributable: 65ms CPU time
Warning::
Third-party scripts: 386ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 15% Script Parsing & Compilation 13% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-L8ZB94ms81ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-S0KJTVVLQ6&cx=c&gtm=4e64h182ms66ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L73ms51ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h171ms52ms19ms3rd
Unattributable65ms4ms0ms3rd
A+
Font Loading
7 fonts (558 KB)
PASS
7 fonts (558 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

558 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 3.2 shttps://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Regular.woffRoboto-Regular.woff https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Regular.woff — 91.7 KiB — 458 ms — font-display: swaphttps://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Bold.woffRoboto-Bold.woff https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Bold.woff — 92.0 KiB — 878 ms — font-display: swaphttps://www.energystar.gov/themes/gesso/dist/fonts/RobotoCondensed-Regular.woffRobotoCondensed-Regular... https://www.energystar.gov/themes/gesso/dist/fonts/RobotoCondensed-Regular.woff — 88.2 KiB — 692 ms — font-display: swaphttps://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Light.woffRoboto-Light.woff https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Light.woff — 91.4 KiB — 483 ms — font-display: swaphttps://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Regular.woff2Roboto-Regular.woff2 https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Regular.woff2 — 64.7 KiB — 761 ms — font-display: swaphttps://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Bold.woff2Roboto-Bold.woff2 https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Bold.woff2 — 64.9 KiB — 609 ms — font-display: swaphttps://www.energystar.gov/themes/gesso/dist/fonts/RobotoCondensed-Regular.woff2RobotoCondensed-Regular... https://www.energystar.gov/themes/gesso/dist/fonts/RobotoCondensed-Regular.woff2 — 65.4 KiB — 618 ms — font-display: swap
Roboto-Regular.woff woff swap
Size 92 KB
Load time 458 ms
Start 607 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Roboto-Bold.woff woff swap
Size 92 KB
Load time 878 ms
Start 607 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
RobotoCondensed-Regular... woff swap
Size 88 KB
Load time 692 ms
Start 607 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Roboto-Light.woff woff swap
Size 91 KB
Load time 483 ms
Start 608 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Roboto-Regular.woff2 woff2 swap
Size 65 KB
Load time 761 ms
Start 694 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Bold.woff2 woff2 swap
Size 65 KB
Load time 609 ms
Start 694 ms
Risk FOUT — text flashes from fallback to web font
RobotoCondensed-Regular... woff2 swap
Size 65 KB
Load time 618 ms
Start 694 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~109 KB and ~218 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
51 requests over 2037ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 3.2 shttps://energystar.gov// https://energystar.gov/ — 301 — 259 B — 312 ms — http/1.1https://www.energystar.gov/www.energystar.gov/ https://www.energystar.gov/ — 200 — 8.9 KiB — 287 ms — h2https://www.energystar.gov/sites/default/files/google_tag/epa/google_tag.script.js?tdfrgbwww.energystar.gov/sites/default/fi... https://www.energystar.gov/sites/default/files/google_tag/epa/google_tag.script.js?tdfrgb — 200 — 712 B — 11 ms — h2https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Regular.woffwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Regular.woff — 200 — 91.7 KiB — 458 ms — h2https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Bold.woffwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Bold.woff — 200 — 92.0 KiB — 878 ms — h2https://www.energystar.gov/themes/gesso/dist/fonts/RobotoCondensed-Regular.woffwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/fonts/RobotoCondensed-Regular.woff — 200 — 88.2 KiB — 692 ms — h2https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Light.woffwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/fonts/Roboto-Light.woff — 200 — 91.4 KiB — 483 ms — h2https://www.energystar.gov/sites/default/files/css/css_pc5LeMrY5nKqRPAdSNVrlQbxGfH4KShp8MVoKx0Y5xI.css?delta=0&language=en&theme=gesso&include=eJxtkI1uhTAIhV_Iq4_U0Ba1EaEBOq9vv-5Ot2VbQvj5TkI4AHuJ4hN81nEW3YcFzWQCQvUQgRn1QhHSFlx61JuQpO3u5RmSEGHyInzD5i4cunaBrFKzHBx25Haxucx-hle-iYijBpNUgAIV3uxSFpIIdA_yhsp9069DV1QJHxrBGRyffvGqkltye3gh_I89_hhQjODYj-P8td4QNK0_TB2nleNchgoKi0JdrftsFWj8JmPj2iIVWzEPVhyPkjG8vjwVLj7YaY57f7LhO5YyoEkwww.energystar.gov/sites/default/fi... https://www.energystar.gov/sites/default/files/css/css_pc5LeMrY5nKqRPAdSNVrlQbxGfH4KShp8MVoKx0Y5xI.css?delta=0&language=en&theme=gesso&include=eJxtkI1uhTAIhV_Iq4_U0Ba1EaEBOq9vv-5Ot2VbQvj5TkI4AHuJ4hN81nEW3YcFzWQCQvUQgRn1QhHSFlx61JuQpO3u5RmSEGHyInzD5i4cunaBrFKzHBx25Haxucx-hle-iYijBpNUgAIV3uxSFpIIdA_yhsp9069DV1QJHxrBGRyffvGqkltye3gh_I89_hhQjODYj-P8td4QNK0_TB2nleNchgoKi0JdrftsFWj8JmPj2iIVWzEPVhyPkjG8vjwVLj7YaY57f7LhO5YyoEk — 200 — 1.7 KiB — 10 ms — h2https://www.energystar.gov/sites/default/files/css/css_9RNXu1_A65uy2wTU2j2VJHR9gRTm7GBFVYUaSttI4bo.css?delta=1&language=en&theme=gesso&include=eJxtkI1uhTAIhV_Iq4_U0Ba1EaEBOq9vv-5Ot2VbQvj5TkI4AHuJ4hN81nEW3YcFzWQCQvUQgRn1QhHSFlx61JuQpO3u5RmSEGHyInzD5i4cunaBrFKzHBx25Haxucx-hle-iYijBpNUgAIV3uxSFpIIdA_yhsp9069DV1QJHxrBGRyffvGqkltye3gh_I89_hhQjODYj-P8td4QNK0_TB2nleNchgoKi0JdrftsFWj8JmPj2iIVWzEPVhyPkjG8vjwVLj7YaY57f7LhO5YyoEkwww.energystar.gov/sites/default/fi... https://www.energystar.gov/sites/default/files/css/css_9RNXu1_A65uy2wTU2j2VJHR9gRTm7GBFVYUaSttI4bo.css?delta=1&language=en&theme=gesso&include=eJxtkI1uhTAIhV_Iq4_U0Ba1EaEBOq9vv-5Ot2VbQvj5TkI4AHuJ4hN81nEW3YcFzWQCQvUQgRn1QhHSFlx61JuQpO3u5RmSEGHyInzD5i4cunaBrFKzHBx25Haxucx-hle-iYijBpNUgAIV3uxSFpIIdA_yhsp9069DV1QJHxrBGRyffvGqkltye3gh_I89_hhQjODYj-P8td4QNK0_TB2nleNchgoKi0JdrftsFWj8JmPj2iIVWzEPVhyPkjG8vjwVLj7YaY57f7LhO5YyoEk — 200 — 27.5 KiB — 18 ms — h2https://www.energystar.gov/themes/gesso/dist/images/uswds/icon-dot-gov.svgwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/images/uswds/icon-dot-gov.svg — 200 — 1.1 KiB — 299 ms — h2https://www.energystar.gov/themes/gesso/dist/images/uswds/icon-https.svgwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/images/uswds/icon-https.svg — 200 — 1.1 KiB — 332 ms — h2https://www.energystar.gov/sites/default/files/styles/hero_large/public/big-banner.jpg.webp?itok=MVOjT56Dwww.energystar.gov/sites/default/fi... https://www.energystar.gov/sites/default/files/styles/hero_large/public/big-banner.jpg.webp?itok=MVOjT56D — 200 — 106.1 KiB — 1.0 s — h2https://www.energystar.gov/themes/gesso/dist/images/ftr_epa_seal.pngwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/images/ftr_epa_seal.png — 200 — 11.1 KiB — 12 ms — h2https://www.energystar.gov/sites/default/files/js/js_XC8Ovo4gpHwpZBEIWO-L_MDsixMp9etwdDyvVPn94fU.js?scope=footer&delta=0&language=en&theme=gesso&include=eJxdjVEKgDAMQy8k7kijc3UUZzu66tjtFZ0_QiDkBRJgoyDm4PV5Fd2nhLWKg4xqPgAz6kABls2b3CqDRJUSpbHfkY_BUpYA-QtyovLd_qZar9R6mioZNoronztHTHYB5Zw6YQwww.energystar.gov/sites/default/fi... https://www.energystar.gov/sites/default/files/js/js_XC8Ovo4gpHwpZBEIWO-L_MDsixMp9etwdDyvVPn94fU.js?scope=footer&delta=0&language=en&theme=gesso&include=eJxdjVEKgDAMQy8k7kijc3UUZzu66tjtFZ0_QiDkBRJgoyDm4PV5Fd2nhLWKg4xqPgAz6kABls2b3CqDRJUSpbHfkY_BUpYA-QtyovLd_qZar9R6mioZNoronztHTHYB5Zw6YQ — 200 — 67.4 KiB — 13 ms — h2https://www.energystar.gov/themes/gesso/dist/images/uswds/us_flag_small.pngwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/images/uswds/us_flag_small.png — 200 — 651 B — 10 ms — h2https://www.energystar.gov/themes/gesso/dist/images/sprite.artifact.svgwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/images/sprite.artifact.svg — 200 — 3.9 KiB — 290 ms — h2https://www.energystar.gov/themes/gesso/dist/images/favicons/site.webmanifestwww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/images/favicons/site.webmanifest — 200 — 550 B — 598 ms — 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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
100% of JavaScript execution is third-party
First-party Third-party 386ms · 620KB · $5/mo
Google Tag Manager
Tag Manager
Optional
Execution 94ms
Transfer 147 KB
Unused 39%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 169 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 147 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 156 KB
Unused 40%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 65ms
Transfer 0 KB
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

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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