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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
87
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.
81
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.

859 ms

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

2.34 s

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

4 ms

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

0.032

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

1.00 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.

2.46 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 107 requests
FIX
4.4 MB transferred, 107 requests
Critical::
Page weighs 7.1 MB (4.4 MB transferred)
Warning::
Images are 3.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.1 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Warning::
107 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.92 g CO2 per page load
4.4 MB / 2.4 MB budget
4.4 MB transferred
107 requests
0.92 g CO2 per page load
Images 3.1 MiB 70%
JavaScript 1.1 MiB 25%
Other 92.3 KiB 2%
Fonts 61.4 KiB 1%
CSS 57.4 KiB 1%
HTML 16.0 KiB 0%
Other 1.4 KiB 0%
Other 855 B 0%
Other 548 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (4.4 MiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
61 scripts, 365 KB unused
FIX
61 scripts, 365 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-VZ5W...: 71 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WK4...: 65 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-293...: 62 KB unused (53%)
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.
Info::
Total unused JavaScript: 365 KB
365 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-VZ5WM65HJE&cx=c&gtm=4e64h1173 KB71 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WK4QFZ4126 KB65 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-29392722-1117 KB62 KB (53%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB61 KB (42%)✓3rd
https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/assets/js/uswds.min.js?v=1.0.08 KB—✓3rd
https://www.youtube.com/iframe_api3 KB—✓3rd
https://www.ready.gov/core/assets/vendor/jquery.ui/ui/version-min.js?v=11.3.60 KB—✓3rd
https://www.ready.gov/core/assets/vendor/jquery.ui/ui/data-min.js?v=11.3.61 KB—✓3rd
https://www.ready.gov/core/assets/vendor/jquery.ui/ui/disable-selection-min.js?v=11.3.61 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

D
Page Weight Inventory
Action
107 resources · 4.4 MB · 365 KB savings available
FIX
107 resources · 4.4 MB · 365 KB savings available
Warning::
Page weight 3.4 MB over 1MB target
Got: 4.4 MB Expected: ≤ 1 MB
Info::
~365 KB of savings available
Warning::
106 third-party resources (100% of weight)
Info::
5 resources over 200KB
107 resources · 4.4 MiB · 106 third-party 3.4 MiB over 1MB target
Image 72% · 3.2 MiB
JavaScript 25% · 1.1 MiB
Font 1% · 61.4 KiB
CSS 1% · 57.4 KiB
Document 0% · 17.0 KiB
Other 0% · 2.4 KiB

~365.2 KiB of savings available

Remove unused JavaScript: 365.2 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
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.ready.gov/profiles/readyd8_gov/themes/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ready.gov/profiles/readyd8_gov/themes/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ready.gov/profiles/readyd8_gov/themes/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26 images 3.1 MB
0 oversized -0 KB
26 legacy format
3 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

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
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
419ms total JS execution
PASS
419ms total JS execution
Info::
https://www.ready.gov/: 134ms CPU time
Info::
Unattributable: 117ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-VZ5W...: 59ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=UA-293...: 58ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 50ms CPU time
Warning::
Third-party scripts: 419ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 28% Style & Layout 14% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.ready.gov/134ms8ms1ms3rd
Unattributable117ms4ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VZ5WM65HJE&cx=c&gtm=4e64h159ms44ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-29392722-158ms49ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L50ms43ms7ms3rd
A+
Font Loading
3 fonts (61 KB)
PASS
3 fonts (61 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

61 KB total

Render-blocking

0

of 3

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 859 ms LCP 2.3 shttps://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.3 KiB — 77 ms — font-display: swaphttps://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/fonts/merriweather/Latin-Merriweather-Bold.woff2Latin-Merriweather-Bold... https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/fonts/merriweather/Latin-Merriweather-Bold.woff2 — 21.0 KiB — 74 ms — font-display: swaphttps://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.1 KiB — 96 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 77 ms
Start 435 ms
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Bold... woff2 swap
Size 21 KB
Load time 74 ms
Start 439 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 96 ms
Start 444 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
107 requests over 2233ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 859 ms LCP 2.3 shttps://ready.gov// https://ready.gov/ — 301 — 234 B — 193 ms — http/1.1https://www.ready.gov/www.ready.gov/ https://www.ready.gov/ — 200 — 11.8 KiB — 62 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-29392722-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-29392722-1 — 200 — 116.9 KiB — 139 ms — h2https://www.ready.gov/sites/default/files/css/css_Piarp_HPpZC43_lqsw_n0pvqHpFXk5b07RPtXxMNrQY.css?delta=0&language=en&theme=uswds_ready&include=eJxVTFsOwjAMu1BYjjRlbZgq0gbV7UY5PYjtg_34KTuYAIOzArIqKHhVLl6zWHor6atZKg-OtT_FptOSyfDe5pgQfNM62IsGN8JA08yLQKljjziHh5mrShx899JwSVbzReyGNr7v66X607Ql3cE_nLLHbkp7yDN63XTwQR-g1lKywww.ready.gov/sites/default/files/c... https://www.ready.gov/sites/default/files/css/css_Piarp_HPpZC43_lqsw_n0pvqHpFXk5b07RPtXxMNrQY.css?delta=0&language=en&theme=uswds_ready&include=eJxVTFsOwjAMu1BYjjRlbZgq0gbV7UY5PYjtg_34KTuYAIOzArIqKHhVLl6zWHor6atZKg-OtT_FptOSyfDe5pgQfNM62IsGN8JA08yLQKljjziHh5mrShx899JwSVbzReyGNr7v66X607Ql3cE_nLLHbkp7yDN63XTwQR-g1lKy — 200 — 4.8 KiB — 20 ms — h2https://www.ready.gov/sites/default/files/css/css_vdg0KtNblgLM_msaRazin3V4Ras5o6RQyKA5CamU7J4.css?delta=1&language=en&theme=uswds_ready&include=eJxVTFsOwjAMu1BYjjRlbZgq0gbV7UY5PYjtg_34KTuYAIOzArIqKHhVLl6zWHor6atZKg-OtT_FptOSyfDe5pgQfNM62IsGN8JA08yLQKljjziHh5mrShx899JwSVbzReyGNr7v66X607Ql3cE_nLLHbkp7yDN63XTwQR-g1lKywww.ready.gov/sites/default/files/c... https://www.ready.gov/sites/default/files/css/css_vdg0KtNblgLM_msaRazin3V4Ras5o6RQyKA5CamU7J4.css?delta=1&language=en&theme=uswds_ready&include=eJxVTFsOwjAMu1BYjjRlbZgq0gbV7UY5PYjtg_34KTuYAIOzArIqKHhVLl6zWHor6atZKg-OtT_FptOSyfDe5pgQfNM62IsGN8JA08yLQKljjziHh5mrShx899JwSVbzReyGNr7v66X607Ql3cE_nLLHbkp7yDN63XTwQR-g1lKy — 200 — 1.2 KiB — 20 ms — h2https://fonts.googleapis.com/css?family=Merriweather:400,700|Source+Sans+Pro:200,400,600,700&display=swapfonts.googleapis.com/css?family=Mer... https://fonts.googleapis.com/css?family=Merriweather:400,700|Source+Sans+Pro:200,400,600,700&display=swap — 200 — 1.4 KiB — 92 ms — h2https://www.ready.gov/sites/default/files/css/css_PAmar0JrynKuKZcofmYaTXdMNjV-hsxueH-Xfy9AU1A.css?delta=3&language=en&theme=uswds_ready&include=eJxVTFsOwjAMu1BYjjRlbZgq0gbV7UY5PYjtg_34KTuYAIOzArIqKHhVLl6zWHor6atZKg-OtT_FptOSyfDe5pgQfNM62IsGN8JA08yLQKljjziHh5mrShx899JwSVbzReyGNr7v66X607Ql3cE_nLLHbkp7yDN63XTwQR-g1lKywww.ready.gov/sites/default/files/c... https://www.ready.gov/sites/default/files/css/css_PAmar0JrynKuKZcofmYaTXdMNjV-hsxueH-Xfy9AU1A.css?delta=3&language=en&theme=uswds_ready&include=eJxVTFsOwjAMu1BYjjRlbZgq0gbV7UY5PYjtg_34KTuYAIOzArIqKHhVLl6zWHor6atZKg-OtT_FptOSyfDe5pgQfNM62IsGN8JA08yLQKljjziHh5mrShx899JwSVbzReyGNr7v66X607Ql3cE_nLLHbkp7yDN63XTwQR-g1lKy — 200 — 49.3 KiB — 22 ms — h2https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/assets/img/us_flag_small.pngwww.ready.gov/profiles/readyd8_gov/... https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/assets/img/us_flag_small.png — 200 — 387 B — 11 ms — h2https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/img/world-icon-green.pngwww.ready.gov/profiles/readyd8_gov/... https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/img/world-icon-green.png — 200 — 8.2 KiB — 12 ms — h2https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/assets/img/icon-dot-gov.svgwww.ready.gov/profiles/readyd8_gov/... https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/assets/img/icon-dot-gov.svg — 200 — 611 B — 22 ms — h2https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/assets/img/icon-https.svgwww.ready.gov/profiles/readyd8_gov/... https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/assets/img/icon-https.svg — 200 — 560 B — 23 ms — h2https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/img/logo_ready_green.pngwww.ready.gov/profiles/readyd8_gov/... https://www.ready.gov/profiles/readyd8_gov/themes/uswds_ready/img/logo_ready_green.png — 200 — 30.3 KiB — 11 ms — h2https://www.ready.gov/core/assets/vendor/jquery/jquery.min.js?v=4.0.0www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 — 200 — 27.2 KiB — 25 ms — h2https://www.ready.gov/core/assets/vendor/once/once.min.js?v=1.0.1www.ready.gov/core/assets/vendor/on... https://www.ready.gov/core/assets/vendor/once/once.min.js?v=1.0.1 — 200 — 941 B — 18 ms — h2https://www.ready.gov/core/misc/drupalSettingsLoader.js?v=11.3.6www.ready.gov/core/misc/drupalSetti... https://www.ready.gov/core/misc/drupalSettingsLoader.js?v=11.3.6 — 200 — 630 B — 8 ms — h2https://www.ready.gov/core/misc/drupal.js?v=11.3.6www.ready.gov/core/misc/drupal.js?v... https://www.ready.gov/core/misc/drupal.js?v=11.3.6 — 200 — 6.3 KiB — 26 ms — h2https://www.ready.gov/core/misc/drupal.init.js?v=11.3.6www.ready.gov/core/misc/drupal.init... https://www.ready.gov/core/misc/drupal.init.js?v=11.3.6 — 200 — 735 B — 22 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/widget-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/widget-min.js?v=11.3.6 — 200 — 3.4 KiB — 131 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/version-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/version-min.js?v=11.3.6 — 200 — 410 B — 87 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/data-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/data-min.js?v=11.3.6 — 200 — 555 B — 89 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/disable-selection-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/disable-selection-min.js?v=11.3.6 — 200 — 634 B — 142 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/jquery-patch-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/jquery-patch-min.js?v=11.3.6 — 200 — 609 B — 49 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/scroll-parent-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/scroll-parent-min.js?v=11.3.6 — 200 — 689 B — 49 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/unique-id-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/unique-id-min.js?v=11.3.6 — 200 — 612 B — 50 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/focusable-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/focusable-min.js?v=11.3.6 — 200 — 795 B — 50 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/keycode-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/keycode-min.js?v=11.3.6 — 200 — 641 B — 51 ms — h2https://www.ready.gov/core/assets/vendor/jquery.ui/ui/plugin-min.js?v=11.3.6www.ready.gov/core/assets/vendor/jq... https://www.ready.gov/core/assets/vendor/jquery.ui/ui/plugin-min.js?v=11.3.6 — 200 — 558 B — 89 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 419ms · 449KB · $6/mo
www.ready.gov
Other
Optional
Execution 134ms
Transfer 12 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 117ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 173 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 117 KB
Unused 53%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 50ms
Transfer 147 KB
Unused 42%
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

53% 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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