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https://genome.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
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.

3.90 s

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

13.53 s

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

926 ms

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

0.000

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

6.41 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.

13.78 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 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.4 MB transferred, 43 requests
FIX
5.4 MB transferred, 43 requests
Critical::
Page weighs 8.6 MB (5.4 MB transferred)
Warning::
Images are 4.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.0 MB
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
43 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.4 MB / 2.4 MB budget
5.4 MB transferred
43 requests
1.1 g CO2 per page load
Images 4.0 MiB 74%
JavaScript 1.3 MiB 23%
CSS 86.9 KiB 2%
Fonts 42.0 KiB 1%
HTML 40.3 KiB 1%
Other 7.7 KiB 0%
Other 956 B 0%
Other 558 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

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 (5.4 MiB of 5.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3376ms total JS execution
FIX
3376ms total JS execution
Warning::
https://www.genome.gov/sites/default/files/js/js_x...: 1152ms CPU time
Warning::
Unattributable: 481ms CPU time
Warning::
https://www.genome.gov/: 332ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 291ms CPU time
Info::
https://www.genome.gov/sites/default/files/google_...: 237ms CPU time
Warning::
Third-party scripts: 3376ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Style & Layout 20% Other 18% Script Parsing & Compilation 16% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.genome.gov/sites/default/files/js/js_xi0FtGdjW2Z6VR7E4ps29cMkIygxI-vuQpt3k_8ypz4.js?scope=footer&delta=0&language=en&theme=nhgri&include=eJxljkEOgzAMBD8UmidZBkwwcmwUJ1B4fZEKl_a2O1qtBt2pAutCQ7USF3-tzWcYTCtphZ5EbAeeoEelEvBvXimvMPEbFLcwFDwPSik-ISSzJASoKEflweMvCJzXYhuNkJtUBie5viNnDzqnwnG6VHAnt0wPaSLdiok6Fx4vqy9OYj3KXRTVEopQOW5yttJ3kzUdsbLpB2MdYl81152ms342ms180ms3rd
Unattributable481ms93ms0ms3rd
https://www.genome.gov/332ms5ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L291ms231ms59ms3rd
https://www.genome.gov/sites/default/files/google_analytics/gtag.js?tdw9db237ms174ms49ms3rd
https://www.googletagmanager.com/gtag/js?id=G-1GVMC3FXSC&cx=c&gtm=4e64h1211ms158ms52ms3rd
https://www.genome.gov/sites/default/files/js/js_wY7SbSc8raFRw1fRnmuVtinauFDQqI3EBpM2ZlZ-Jrw.js?scope=footer&delta=2&language=en&theme=nhgri&include=eJxljkEOgzAMBD8UmidZBkwwcmwUJ1B4fZEKl_a2O1qtBt2pAutCQ7USF3-tzWcYTCtphZ5EbAeeoEelEvBvXimvMPEbFLcwFDwPSik-ISSzJASoKEflweMvCJzXYhuNkJtUBie5viNnDzqnwnG6VHAnt0wPaSLdiok6Fx4vqy9OYj3KXRTVEopQOW5yttJ3kzUdsbLpB2MdYl8202ms85ms59ms3rd
https://code.jquery.com/ui/1.12.1/jquery-ui.js131ms52ms78ms3rd
https://www.genome.gov/sites/default/files/css/css_S9fxr0VKT9XswDa4m5Lk9YATdxRc8X_jIkStpGRT9KQ.css?delta=1&language=en&theme=nhgri&include=eJyFkFFywzAIRC9kW0fS4AhJdJDQgJQ0PX3t1Gk-4k4_2X3LLIAZdk_1Ay9d1F3MlkAx-ivhbYJ3M7GswL6AJqpnQJaCDRL6SJ--Y2n_QWhnhGITo05SvWVQ9OvoXeop29O-59TJpOGI_s0o_q5_tI6i_tlwotJUrhh8GdzJG_IWdVRsqjkpuSi1ww1t45_KYJ737GxMAfWQfz53DBWqJGBGvR_K19B1jjJqgP3qqYFCUmjZXNDRgJeXsozaxspkGcNkd9ve7FYw_AY3VbZ9108ms0ms0ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js97ms93ms2ms3rd

Showing top 10 of 12 scripts

F
JS Bundles
Action
11 scripts, 500 KB unused
FIX
11 scripts, 500 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://code.jquery.com/ui/1.12.1/jquery-ui.js: 89 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://code.jquery.com/ui/1.12.1/jquery-ui.js: unminified — 38 KB could be saved
Warning::
https://www.genome.gov/sites/default/files/js/js_w...: 87 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.genome.gov/sites/default/files/google_...: 61 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 500 KB
500 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://code.jquery.com/ui/1.12.1/jquery-ui.js122 KB89 KB (84%)✗3rd
https://www.genome.gov/sites/default/files/js/js_wY7SbSc8raFRw1fRnmuVtinauFDQqI3EBpM2ZlZ-Jrw.js?scope=footer&delta=2&language=en&theme=nhgri&include=eJxljkEOgzAMBD8UmidZBkwwcmwUJ1B4fZEKl_a2O1qtBt2pAutCQ7USF3-tzWcYTCtphZ5EbAeeoEelEvBvXimvMPEbFLcwFDwPSik-ISSzJASoKEflweMvCJzXYhuNkJtUBie5viNnDzqnwnG6VHAnt0wPaSLdiok6Fx4vqy9OYj3KXRTVEopQOW5yttJ3kzUdsbLpB2MdYl8110 KB87 KB (79%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.genome.gov/sites/default/files/google_analytics/gtag.js?tdw9db123 KB61 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-1GVMC3FXSC&cx=c&gtm=4e64h1149 KB61 KB (41%)✓3rd
https://www.genome.gov/sites/default/files/js/js_xi0FtGdjW2Z6VR7E4ps29cMkIygxI-vuQpt3k_8ypz4.js?scope=footer&delta=0&language=en&theme=nhgri&include=eJxljkEOgzAMBD8UmidZBkwwcmwUJ1B4fZEKl_a2O1qtBt2pAutCQ7USF3-tzWcYTCtphZ5EbAeeoEelEvBvXimvMPEbFLcwFDwPSik-ISSzJASoKEflweMvCJzXYhuNkJtUBie5viNnDzqnwnG6VHAnt0wPaSLdiok6Fx4vqy9OYj3KXRTVEopQOW5yttJ3kzUdsbLpB2MdYl8455 KB34 KB (7%)✓3rd
https://script.crazyegg.com/pages/scripts/0097/2751.js0 KB—✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NIH9 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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
43 resources · 5.4 MB · 500 KB savings available
FIX
43 resources · 5.4 MB · 500 KB savings available
Warning::
Page weight 4.4 MB over 1MB target
Got: 5.4 MB Expected: ≤ 1 MB
Info::
~500 KB of savings available
Warning::
42 third-party resources (100% of weight)
Info::
2 resources over 200KB
43 resources · 5.4 MiB · 42 third-party 4.4 MiB over 1MB target
Image 74% · 4.0 MiB
JavaScript 23% · 1.3 MiB
CSS 2% · 86.9 KiB
Font 1% · 42.0 KiB
Document 1% · 40.3 KiB
Other 0% · 1.6 KiB

~499.5 KiB of savings available

Remove unused JavaScript: 499.5 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
Image Optimization
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://www.genome.gov/themes/custom/nhgri/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 4.0 MB
0 oversized -0 KB
3 legacy format
1 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

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
1 fonts (42 KB)
PASS
1 fonts (42 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

42 KB total

Render-blocking

0

of 1

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 FCP 3.9 s LCP 13.5 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 12 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 12 ms
Start 571 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
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
43 requests over 1004ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.9 s LCP 13.5 shttps://genome.gov// https://genome.gov/ — 301 — 172 B — 100 ms — http/1.0https://www.genome.gov/www.genome.gov/ https://www.genome.gov/ — 200 — 40.3 KiB — 111 ms — h2https://www.genome.gov/sites/default/files/google_analytics/gtag.js?tdw9dbwww.genome.gov/sites/default/files/... https://www.genome.gov/sites/default/files/google_analytics/gtag.js?tdw9db — 200 — 123.5 KiB — 58 ms — h2https://www.genome.gov/sites/default/files/css/css_7bNgxpTyyDOGVcNhI8rWh6jpOc1eJhVRYW5xpsCoGb0.css?delta=0&language=en&theme=nhgri&include=eJyFkFFywzAIRC9kW0fS4AhJdJDQgJQ0PX3t1Gk-4k4_2X3LLIAZdk_1Ay9d1F3MlkAx-ivhbYJ3M7GswL6AJqpnQJaCDRL6SJ--Y2n_QWhnhGITo05SvWVQ9OvoXeop29O-59TJpOGI_s0o_q5_tI6i_tlwotJUrhh8GdzJG_IWdVRsqjkpuSi1ww1t45_KYJ737GxMAfWQfz53DBWqJGBGvR_K19B1jjJqgP3qqYFCUmjZXNDRgJeXsozaxspkGcNkd9ve7FYw_AY3VbZ9www.genome.gov/sites/default/files/... https://www.genome.gov/sites/default/files/css/css_7bNgxpTyyDOGVcNhI8rWh6jpOc1eJhVRYW5xpsCoGb0.css?delta=0&language=en&theme=nhgri&include=eJyFkFFywzAIRC9kW0fS4AhJdJDQgJQ0PX3t1Gk-4k4_2X3LLIAZdk_1Ay9d1F3MlkAx-ivhbYJ3M7GswL6AJqpnQJaCDRL6SJ--Y2n_QWhnhGITo05SvWVQ9OvoXeop29O-59TJpOGI_s0o_q5_tI6i_tlwotJUrhh8GdzJG_IWdVRsqjkpuSi1ww1t45_KYJ737GxMAfWQfz53DBWqJGBGvR_K19B1jjJqgP3qqYFCUmjZXNDRgJeXsozaxspkGcNkd9ve7FYw_AY3VbZ9 — 200 — 1.9 KiB — 18 ms — h2https://www.genome.gov/sites/default/files/css/css_S9fxr0VKT9XswDa4m5Lk9YATdxRc8X_jIkStpGRT9KQ.css?delta=1&language=en&theme=nhgri&include=eJyFkFFywzAIRC9kW0fS4AhJdJDQgJQ0PX3t1Gk-4k4_2X3LLIAZdk_1Ay9d1F3MlkAx-ivhbYJ3M7GswL6AJqpnQJaCDRL6SJ--Y2n_QWhnhGITo05SvWVQ9OvoXeop29O-59TJpOGI_s0o_q5_tI6i_tlwotJUrhh8GdzJG_IWdVRsqjkpuSi1ww1t45_KYJ737GxMAfWQfz53DBWqJGBGvR_K19B1jjJqgP3qqYFCUmjZXNDRgJeXsozaxspkGcNkd9ve7FYw_AY3VbZ9www.genome.gov/sites/default/files/... https://www.genome.gov/sites/default/files/css/css_S9fxr0VKT9XswDa4m5Lk9YATdxRc8X_jIkStpGRT9KQ.css?delta=1&language=en&theme=nhgri&include=eJyFkFFywzAIRC9kW0fS4AhJdJDQgJQ0PX3t1Gk-4k4_2X3LLIAZdk_1Ay9d1F3MlkAx-ivhbYJ3M7GswL6AJqpnQJaCDRL6SJ--Y2n_QWhnhGITo05SvWVQ9OvoXeop29O-59TJpOGI_s0o_q5_tI6i_tlwotJUrhh8GdzJG_IWdVRsqjkpuSi1ww1t45_KYJ737GxMAfWQfz53DBWqJGBGvR_K19B1jjJqgP3qqYFCUmjZXNDRgJeXsozaxspkGcNkd9ve7FYw_AY3VbZ9 — 200 — 81.7 KiB — 37 ms — h2https://www.genome.gov/sites/default/files/css/css_Bja-lTOnFQWXVat4QvC77PLgdp_NcCLsyu8dFIw6hzM.css?delta=2&language=en&theme=nhgri&include=eJyFkFFywzAIRC9kW0fS4AhJdJDQgJQ0PX3t1Gk-4k4_2X3LLIAZdk_1Ay9d1F3MlkAx-ivhbYJ3M7GswL6AJqpnQJaCDRL6SJ--Y2n_QWhnhGITo05SvWVQ9OvoXeop29O-59TJpOGI_s0o_q5_tI6i_tlwotJUrhh8GdzJG_IWdVRsqjkpuSi1ww1t45_KYJ737GxMAfWQfz53DBWqJGBGvR_K19B1jjJqgP3qqYFCUmjZXNDRgJeXsozaxspkGcNkd9ve7FYw_AY3VbZ9www.genome.gov/sites/default/files/... https://www.genome.gov/sites/default/files/css/css_Bja-lTOnFQWXVat4QvC77PLgdp_NcCLsyu8dFIw6hzM.css?delta=2&language=en&theme=nhgri&include=eJyFkFFywzAIRC9kW0fS4AhJdJDQgJQ0PX3t1Gk-4k4_2X3LLIAZdk_1Ay9d1F3MlkAx-ivhbYJ3M7GswL6AJqpnQJaCDRL6SJ--Y2n_QWhnhGITo05SvWVQ9OvoXeop29O-59TJpOGI_s0o_q5_tI6i_tlwotJUrhh8GdzJG_IWdVRsqjkpuSi1ww1t45_KYJ737GxMAfWQfz53DBWqJGBGvR_K19B1jjJqgP3qqYFCUmjZXNDRgJeXsozaxspkGcNkd9ve7FYw_AY3VbZ9 — 200 — 991 B — 13 ms — h2https://www.genome.gov/themes/custom/nhgri/assets/global/logo-light-nhgri.webpwww.genome.gov/themes/custom/nhgri/... https://www.genome.gov/themes/custom/nhgri/assets/global/logo-light-nhgri.webp — 200 — 14.5 KiB — 14 ms — h2https://www.genome.gov/themes/custom/nhgri/assets/global/NHGRI_grey_teal.svgwww.genome.gov/themes/custom/nhgri/... https://www.genome.gov/themes/custom/nhgri/assets/global/NHGRI_grey_teal.svg — 200 — 25.6 KiB — 24 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 3376ms · 1400KB · $45/mo
www.genome.gov
Other
Costly
Execution 1152ms
Transfer 455 KB
Unused 7%
Monthly Cost $15/mo
Unattributable
Other
Costly
Execution 481ms
Transfer 0 KB
Monthly Cost $6/mo
www.genome.gov
Other
Costly
Execution 332ms
Transfer 40 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 291ms
Transfer 147 KB
Unused 43%
Monthly Cost $4/mo
www.genome.gov
Other
Costly
Execution 237ms
Transfer 123 KB
Unused 50%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 211ms
Transfer 149 KB
Unused 41%
Monthly Cost $3/mo
www.genome.gov
Other
Costly
Execution 202ms
Transfer 110 KB
Unused 79%
Monthly Cost $3/mo
code.jquery.com
Other
Optional
Execution 131ms
Transfer 122 KB
Unused 84%
Monthly Cost $2/mo
www.genome.gov
Other
Optional
Execution 108ms
Transfer 82 KB
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 97ms
Transfer 4 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 50ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.genome.gov adds 1152ms and costs ~$15/month
  • Unattributable adds 481ms and costs ~$6/month
  • www.genome.gov adds 332ms and costs ~$4/month
  • Google Tag Manager adds 291ms and costs ~$4/month
  • www.genome.gov adds 237ms and costs ~$3/month
  • Google Tag Manager adds 211ms and costs ~$3/month
  • www.genome.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

www.genome.gov takes 1152ms 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 481ms 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.genome.gov takes 332ms 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 291ms 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.genome.gov takes 237ms 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 211ms 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.genome.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

79% of www.genome.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

84% of code.jquery.com'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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