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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
49
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.
92
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.

2.59 s

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

16.31 s

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

496 ms

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

0.119

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

6.46 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.

16.32 s

Page Load Progression

929 ms
1.9 s
2.8 s
3.7 s
4.6 s
5.6 s
6.5 s
7.4 s
Checks
17
7 PASS 3 REVIEW 5 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 97 requests
FIX
2.3 MB transferred, 97 requests
Info::
Page weighs 5.0 MB (2.3 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Warning::
JavaScript is 874 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 874 KB
Info::
97 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
97 requests
0.48 g CO2 per page load
Images 1.2 MiB 52%
JavaScript 874.5 KiB 37%
CSS 101.7 KiB 4%
Fonts 99.9 KiB 4%
Other 32.9 KiB 1%
HTML 15.6 KiB 1%
Other 4.0 KiB 0%
Other 615 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

D
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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2328ms total JS execution
FIX
2328ms total JS execution
Warning::
https://www.epa.gov/: 540ms CPU time
Warning::
Unattributable: 440ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-L8Z...: 276ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2SEC...: 252ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 240ms CPU time
Warning::
Third-party scripts: 2328ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Other 30% Script Parsing & Compilation 10% Style & Layout 10% Rendering 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.epa.gov/540ms10ms2ms3rd
Unattributable440ms8ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-L8ZB276ms231ms40ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h1252ms213ms37ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L240ms202ms36ms3rd
https://touchpoints.app.cloud.gov/touchpoints/f276bd95.js138ms57ms37ms3rd
https://www.epa.gov/themes/epa_theme/js/dist/scripts.min.js?v=20251211119ms59ms18ms3rd
https://www.epa.gov/core/assets/vendor/jquery/jquery.min.js?v=3.7.199ms52ms11ms3rd
https://www.epa.gov/core/misc/drupal.init.js?v=10.3.1491ms67ms0ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js75ms72ms1ms3rd

Showing top 10 of 11 scripts

D
Page Weight Inventory
Action
97 resources · 2.3 MB · 287 KB savings available
FIX
97 resources · 2.3 MB · 287 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~287 KB of savings available
Warning::
96 third-party resources (100% of weight)
Info::
3 resources over 200KB
97 resources · 2.3 MiB · 96 third-party 1.3 MiB over 1MB target
Image 53% · 1.2 MiB
JavaScript 37% · 874.5 KiB
CSS 4% · 101.7 KiB
Font 4% · 99.9 KiB
Document 1% · 18.3 KiB
Other 0% · 2.2 KiB

~287.4 KiB of savings available

Remove unused JavaScript: 287.4 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
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://touchpoints.app.cloud.gov/img/us_flag_smal... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cg-1b082c1b-3db7-477f-9ca5-bd51a786b41e.s3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 1.2 MB
0 oversized -0 KB
16 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
38 scripts, 287 KB unused
REVIEW
38 scripts, 287 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-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 (39%)
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: 287 KB
287 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-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h1156 KB62 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-L8ZB147 KB58 KB (39%)✓3rd
https://www.epa.gov/themes/epa_theme/js/dist/sitewide-alert.min.js?v=202512112 KB—✓3rd
https://www.epa.gov/themes/epa_theme/js/dist/external-links.min.js?v=202512113 KB—✓3rd
https://www.epa.gov/modules/custom/epa_wysiwyg/js/plugins/epaNew/epaNew.js?tc8i6t2 KB—✓3rd
https://www.epa.gov/core/misc/progress.js?v=10.3.142 KB—✓3rd
https://www.epa.gov/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.02 KB—✓3rd
https://www.epa.gov/core/misc/debounce.js?v=10.3.141 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (100 KB)
PASS
5 fonts (100 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

100 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.6 s LCP 16.3 shttps://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.5 KiB — 92 ms — font-display: swaphttps://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.3 KiB — 92 ms — font-display: swaphttps://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2sourcesanspro-italic-we... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2 — 16.4 KiB — 91 ms — font-display: swaphttps://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2Latin-Merriweather-Bold... https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2 — 21.2 KiB — 99 ms — font-display: swaphttps://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Regular.woff2Latin-Merriweather-Regu... https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Regular.woff2 — 21.6 KiB — 84 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 92 ms
Start 610 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 92 ms
Start 610 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-italic-we... woff2 swap
Size 16 KB
Load time 91 ms
Start 611 ms
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Bold... woff2 swap
Size 21 KB
Load time 99 ms
Start 611 ms
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Regu... woff2 swap
Size 22 KB
Load time 84 ms
Start 751 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
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
97 requests over 6839ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.6 s LCP 16.3 shttps://epa.gov// https://epa.gov/ — 301 — 320 B — 526 ms — http/1.1https://www.epa.gov/www.epa.gov/ https://www.epa.gov/ — 200 — 15.6 KiB — 69 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 200 — 20.5 KiB — 92 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 200 — 20.3 KiB — 92 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2 — 200 — 16.4 KiB — 91 ms — h2https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2 — 200 — 21.2 KiB — 99 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/align.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/align.module.css?tc8i6t — 200 — 1.2 KiB — 45 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/fieldgroup.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/fieldgroup.module.css?tc8i6t — 200 — 878 B — 37 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/container-inline.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/container-inline.module.css?tc8i6t — 200 — 1008 B — 34 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/clearfix.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/clearfix.module.css?tc8i6t — 200 — 1.1 KiB — 38 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/details.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/details.module.css?tc8i6t — 200 — 890 B — 51 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/hidden.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/hidden.module.css?tc8i6t — 200 — 1.3 KiB — 42 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/item-list.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/item-list.module.css?tc8i6t — 200 — 1.0 KiB — 41 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/js.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/js.module.css?tc8i6t — 200 — 1.2 KiB — 39 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/nowrap.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/nowrap.module.css?tc8i6t — 200 — 880 B — 48 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/position-container.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/position-container.module.css?tc8i6t — 200 — 878 B — 45 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/reset-appearance.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/reset-appearance.module.css?tc8i6t — 200 — 1.0 KiB — 51 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/resize.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/resize.module.css?tc8i6t — 200 — 1.0 KiB — 57 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-counter.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-counter.css?tc8i6t — 200 — 1.5 KiB — 55 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-counters.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-counters.css?tc8i6t — 200 — 1.3 KiB — 64 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-general-info.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-general-info.css?tc8i6t — 200 — 1.0 KiB — 60 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/tablesort.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/tablesort.module.css?tc8i6t — 200 — 1.1 KiB — 58 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/progress.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/progress.module.css?tc8i6t — 200 — 1.6 KiB — 76 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/ajax-progress.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/ajax-progress.module.css?tc8i6t — 200 — 1.2 KiB — 61 ms — h2https://www.epa.gov/themes/contrib/stable/css/views/views.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/views/views.module.css?tc8i6t — 200 — 1.2 KiB — 65 ms — h2https://www.epa.gov/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tc8i6twww.epa.gov/modules/contrib/paragra... https://www.epa.gov/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tc8i6t — 200 — 841 B — 79 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-arabic.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-arabic.css?tc8i6t — 200 — 1.1 KiB — 71 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-kr.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-kr.css?tc8i6t — 200 — 1.2 KiB — 62 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-bn.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-bn.css?tc8i6t — 200 — 1.2 KiB — 75 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-gu.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-gu.css?tc8i6t — 200 — 1.2 KiB — 68 ms — h2
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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 2328ms · 759KB · $31/mo
www.epa.gov
Other
Costly
Execution 540ms
Transfer 16 KB
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 440ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 276ms
Transfer 147 KB
Unused 39%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 252ms
Transfer 156 KB
Unused 39%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 240ms
Transfer 147 KB
Unused 42%
Monthly Cost $3/mo
touchpoints.app.cloud.gov
Other
Optional
Execution 138ms
Transfer 80 KB
Monthly Cost $2/mo
www.epa.gov
Other
Optional
Execution 119ms
Transfer 29 KB
Monthly Cost $2/mo
www.epa.gov
Other
Optional
Execution 99ms
Transfer 30 KB
Monthly Cost $1/mo
www.epa.gov
Other
Optional
Execution 91ms
Transfer 2 KB
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 75ms
Transfer 4 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.epa.gov adds 540ms and costs ~$7/month
  • Unattributable adds 440ms and costs ~$6/month
  • Google Tag Manager adds 276ms and costs ~$4/month
  • Google Tag Manager adds 252ms and costs ~$3/month
  • Google Tag Manager adds 240ms 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.epa.gov takes 540ms 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 440ms 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 276ms 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 252ms 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 240ms 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

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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