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https://energystar.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
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.

2.89 s

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

8.97 s

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

554 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.

3.45 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.

11.97 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 4 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 (1.5 MiB of 1.5 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-2SEC...: 62 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 61 KB unused (42%)
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-2SEC4V3SK9&cx=c&gtm=4e64h1156 KB62 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB61 KB (42%)✓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
48 resources · 1.5 MB · 413 KB savings available
FIX
48 resources · 1.5 MB · 413 KB savings available
Warning::
Page weight 547 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~413 KB of savings available
Warning::
47 third-party resources (100% of weight)
48 resources · 1.5 MiB · 47 third-party 547.4 KiB over 1MB target
JavaScript 54% · 848.8 KiB
Font 31% · 492.9 KiB
Image 12% · 188.9 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.

B
Page Weight Budget
1.5 MB transferred, 48 requests
REVIEW
1.5 MB transferred, 48 requests
Info::
Page weighs 3.3 MB (1.5 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 493 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 493 KB
Info::
48 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
48 requests
0.32 g CO2 per page load
JavaScript 848.8 KiB 54%
Fonts 492.9 KiB 31%
Images 169.6 KiB 11%
CSS 29.2 KiB 2%
Other 19.6 KiB 1%
HTML 8.9 KiB 1%
Other 1.9 KiB 0%
Other 551 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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Info::
All images are well-optimized
21 images 170 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1750ms total JS execution
REVIEW
1750ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-L8Z...: 331ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S0KJ...: 253ms CPU time
Warning::
Unattributable: 253ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-2SEC...: 243ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 231ms CPU time
Warning::
Third-party scripts: 1750ms (100% of total)

Main Thread Breakdown

Script Evaluation 57% Other 15% Script Parsing & Compilation 12% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-L8ZB331ms268ms38ms3rd
https://www.googletagmanager.com/gtag/js?id=G-S0KJTVVLQ6&cx=c&gtm=4e64h1253ms193ms49ms3rd
Unattributable253ms10ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h1243ms201ms40ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L231ms191ms39ms3rd
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_qZar9R6mioZNoronztHTHYB5Zw6YQ202ms40ms19ms3rd
https://www.energystar.gov/120ms9ms0ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js66ms64ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h151ms22ms29ms3rd
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
6 fonts (493 KB)
PASS
6 fonts (493 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

493 KB total

Render-blocking

0

of 6

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 8.0 s 9.0 s FCP 2.9 s LCP 9.0 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 — 578 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 — 916 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 — 534 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 — 1.5 s — 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 — 643 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 — 560 ms — font-display: swap
Roboto-Regular.woff woff swap
Size 92 KB
Load time 578 ms
Start 791 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 916 ms
Start 792 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 534 ms
Start 792 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 1.5 s
Start 792 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 643 ms
Start 881 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Bold.woff2 woff2 swap
Size 65 KB
Load time 560 ms
Start 881 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
—

4 resource hints configured

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
48 requests over 2718ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.9 s LCP 9.0 shttps://energystar.gov// https://energystar.gov/ — 301 — 259 B — 360 ms — http/1.1https://www.energystar.gov/www.energystar.gov/ https://www.energystar.gov/ — 200 — 8.9 KiB — 418 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 — 705 B — 7 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 — 578 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 — 916 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 — 534 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 — 1.5 s — 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 — 21 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 — 23 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 — 429 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 — 384 ms — h2https://www.energystar.gov/sites/default/files/styles/hero_small/public/big-banner.jpg.webp?itok=5Fx53wDtwww.energystar.gov/sites/default/fi... https://www.energystar.gov/sites/default/files/styles/hero_small/public/big-banner.jpg.webp?itok=5Fx53wDt — 200 — 38.5 KiB — 425 ms — 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 — 25 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... 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https://region1.google-analytics.com/g/collect?v=2&tid=G-S0KJTVVLQ6&gtm=45je64h1v867524516z8542870za20gzb542870zd542870&_p=1776808677817&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=626218441.1776808678&frm=0&pscdl=noapi&rcb=8&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401&sid=1776808678&sct=1&seg=0&dl=https%3A%2F%2Fwww.energystar.gov%2F&dt=Homepage%20%7C%20ENERGY%20STAR&en=page_view&_fv=1&_nsi=1&_ss=1&ep.eeps_source_session=Other%20Traffic%20Source&ep.eeps_source=Other%20Traffic%20Source&ep.eeps_referrer=&tfd=1199 — 204 — 552 B — 89 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-2SEC4V3SK9&gtm=45je64h1v878556849z8542870za20gzb542870zd542870&_p=1776808677817&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=626218441.1776808678&frm=0&pscdl=noapi&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~117884344&sid=1776808678&sct=1&seg=0&dl=https%3A%2F%2Fwww.energystar.gov%2F&dt=Homepage%20%7C%20ENERGY%20STAR&en=page_view&_fv=1&_ss=1&ep.dc_language=&ep.debug_mode=true&ep.visitor_id=one%20and%20done%20visitor&ep.microsite=not-assigned&ep.resource_directory=not-assigned&ep.page_node_id=not-assigned&ep.tracking_script_version=EPA%203.0%20160101%20-%20GTM%20version%20320&ep.tracking_script_name=GTM-L8ZB&ep.page_type=not-assigned&ep.webarea_navigation_type=No%20Web%20Area%20type%20defined&ep.web_area=No%20Web%20Area%20Defined&tfd=1277region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-2SEC4V3SK9&gtm=45je64h1v878556849z8542870za20gzb542870zd542870&_p=1776808677817&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=626218441.1776808678&frm=0&pscdl=noapi&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~117884344&sid=1776808678&sct=1&seg=0&dl=https%3A%2F%2Fwww.energystar.gov%2F&dt=Homepage%20%7C%20ENERGY%20STAR&en=page_view&_fv=1&_ss=1&ep.dc_language=&ep.debug_mode=true&ep.visitor_id=one%20and%20done%20visitor&ep.microsite=not-assigned&ep.resource_directory=not-assigned&ep.page_node_id=not-assigned&ep.tracking_script_version=EPA%203.0%20160101%20-%20GTM%20version%20320&ep.tracking_script_name=GTM-L8ZB&ep.page_type=not-assigned&ep.webarea_navigation_type=No%20Web%20Area%20type%20defined&ep.web_area=No%20Web%20Area%20Defined&tfd=1277 — 204 — 48 B — 76 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb542870zd542870&_p=1776808677817&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=626218441.1776808678&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117384405~118167059&dl=https%3A%2F%2Fenergystar.gov%2F&dt=Homepage%20%7C%20ENERGY%20STAR&dr=&sid=1776808678&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=EPA&ep.subagency=ENERGYSTAR.GOV&ep.site_topic=unspecified%3Aenergystar.gov&ep.site_platform=unspecified%3Aenergystar.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=energystar.gov&tfd=1343region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb542870zd542870&_p=1776808677817&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=626218441.1776808678&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266400~117384405~118167059&dl=https%3A%2F%2Fenergystar.gov%2F&dt=Homepage%20%7C%20ENERGY%20STAR&dr=&sid=1776808678&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=EPA&ep.subagency=ENERGYSTAR.GOV&ep.site_topic=unspecified%3Aenergystar.gov&ep.site_platform=unspecified%3Aenergystar.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=energystar.gov&tfd=1343 — 204 — 48 B — 39 ms — h2https://www.energystar.gov/themes/gesso/dist/images/favicons/favicon.icowww.energystar.gov/themes/gesso/dis... https://www.energystar.gov/themes/gesso/dist/images/favicons/favicon.ico — 200 — 15.4 KiB — 394 ms — h2
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 1750ms · 847KB · $23/mo
Google Tag Manager
Tag Manager
Costly
Execution 331ms
Transfer 147 KB
Unused 39%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 253ms
Transfer 169 KB
Unused 41%
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 253ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 243ms
Transfer 156 KB
Unused 40%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 231ms
Transfer 147 KB
Unused 42%
Monthly Cost $3/mo
www.energystar.gov
Other
Costly
Execution 202ms
Transfer 67 KB
Unused 84%
Monthly Cost $3/mo
www.energystar.gov
Other
Optional
Execution 120ms
Transfer 9 KB
Monthly Cost $2/mo
dap.digitalgov.gov
Other
Optional
Execution 66ms
Transfer 4 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 51ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 331ms and costs ~$4/month
  • Google Tag Manager adds 253ms and costs ~$3/month
  • Unattributable adds 253ms and costs ~$3/month
  • Google Tag Manager adds 243ms and costs ~$3/month
  • Google Tag Manager adds 231ms and costs ~$3/month
  • www.energystar.gov adds 202ms 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

Google Tag Manager takes 331ms 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 253ms 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 253ms 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 243ms 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 231ms 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.energystar.gov takes 202ms 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

84% of www.energystar.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

72% 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

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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