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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
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
98
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.
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.

5.55 s

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

48.13 s

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

683 ms

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

0.007

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

8.51 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.

50.21 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
12.1 MB transferred, 61 requests
FIX
12.1 MB transferred, 61 requests
Critical::
Page weighs 14.3 MB (12.1 MB transferred)
Warning::
Images are 10.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 10.8 MB
Warning::
JavaScript is 967 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 967 KB
Info::
61 HTTP requests
Info::
Estimated 2.5 g CO2 per page load
12.1 MB / 2.4 MB budget
12.1 MB transferred
61 requests
2.5 g CO2 per page load
Images 10.8 MiB 90%
JavaScript 967.4 KiB 8%
Fonts 188.8 KiB 2%
CSS 58.9 KiB 0%
HTML 16.4 KiB 0%
Other 6.3 KiB 0%
Other 1.1 KiB 0%
Other 753 B 0%
Other 556 B 0%
Other 396 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 (12.1 MiB of 12.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2774ms total JS execution
FIX
2774ms total JS execution
Warning::
Unattributable: 692ms CPU time
Warning::
https://www.ornl.gov/: 533ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 286ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-TGYF...: 250ms CPU time
Info::
https://www.ornl.gov/sites/default/files/js/js_pEy...: 231ms CPU time
Warning::
Third-party scripts: 2774ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Style & Layout 23% Other 21% Script Parsing & Compilation 13%
ScriptTotalScriptingParse/CompileParty
Unattributable692ms122ms0ms3rd
https://www.ornl.gov/533ms13ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L286ms228ms56ms3rd
https://www.googletagmanager.com/gtag/js?id=G-TGYF36HYE6&cx=c&gtm=4e64h1250ms184ms63ms3rd
https://www.ornl.gov/sites/default/files/js/js_pEyWYYs2P5YOe8P2DrIpwusHJSXaJiPqURmaqoC0ST8.js?scope=footer&delta=7&language=en&theme=ornl&include=eJxNy0EOgCAMRNELiZzDU5gqFWugxVJNuL0kunA3_yUDIZgANw_fGDcVtkGUk49JFkiuWkvE8TXKENGtUIyE62vHeaE2t8uNOrFh_1cynCkX7eb_8QDUrSyU231ms36ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N5VHQ6M2200ms151ms44ms3rd
https://use.fontawesome.com/releases/v5.0.8/js/all.js143ms38ms99ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js107ms103ms2ms3rd
https://siteimproveanalytics.com/js/siteanalyze_6024880.js100ms69ms28ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h188ms29ms58ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
22 scripts, 313 KB unused
FIX
22 scripts, 313 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/gtm.js?id=GTM-N5V...: 62 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-TGYF...: 62 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.addtoany.com/menu/modules/core.ydpp...: 21 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 313 KB
313 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/gtm.js?id=GTM-N5VHQ6M2119 KB62 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-TGYF36HYE6&cx=c&gtm=4e64h1158 KB62 KB (39%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/ScrollMagic.min.js6 KB—✓3rd
https://siteimproveanalytics.com/js/siteanalyze_6024880.js21 KB—✓3rd
https://www.ornl.gov/sites/default/files/js/js_pEyWYYs2P5YOe8P2DrIpwusHJSXaJiPqURmaqoC0ST8.js?scope=footer&delta=7&language=en&theme=ornl&include=eJxNy0EOgCAMRNELiZzDU5gqFWugxVJNuL0kunA3_yUDIZgANw_fGDcVtkGUk49JFkiuWkvE8TXKENGtUIyE62vHeaE2t8uNOrFh_1cynCkX7eb_8QDUrSyU1 KB—✓3rd
https://use.fontawesome.com/releases/v5.0.8/js/all.js248 KB—✓3rd
https://www.ornl.gov/sites/default/files/js/js_f57zbLLLi7ZM3iIXOVkARtNNsYejqHS3_LQvPHWbm4U.js?scope=footer&delta=9&language=en&theme=ornl&include=eJxNy0EOgCAMRNELiZzDU5gqFWugxVJNuL0kunA3_yUDIZgANw_fGDcVtkGUk49JFkiuWkvE8TXKENGtUIyE62vHeaE2t8uNOrFh_1cynCkX7eb_8QDUrSyU1 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
61 resources · 12.1 MB · 313 KB savings available
FIX
61 resources · 12.1 MB · 313 KB savings available
Warning::
Page weight 11.1 MB over 1MB target
Got: 12.1 MB Expected: ≤ 1 MB
Info::
~313 KB of savings available
Warning::
60 third-party resources (100% of weight)
Info::
9 resources over 200KB
61 resources · 12.1 MiB · 60 third-party 11.1 MiB over 1MB target
Image 90% · 10.8 MiB
JavaScript 8% · 967.4 KiB
Font 2% · 188.8 KiB
CSS 0% · 58.9 KiB
Document 0% · 16.4 KiB
Other 0% · 2.9 KiB

~313.1 KiB of savings available

Remove unused JavaScript: 313.1 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://www.ornl.gov/themes/custom/ornl/images/orn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ornl.gov/themes/custom/ornl/images/doe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ornl.gov/themes/custom/ornl/images/bat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 10.8 MB
0 oversized -0 KB
16 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+
Font Loading
7 fonts (189 KB)
PASS
7 fonts (189 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

189 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s FCP 5.6 s LCP 48.1 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 10 ms — font-display: swaphttps://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 — 24 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2S6u9w4BMUTPHh6UVSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 13.9 KiB — 27 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 31 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2memtYaGs126MiZpBA-UFUIc... https://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2 — 44.0 KiB — 33 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2 — 16.3 KiB — 18 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTUGmu0SC55K5gw.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTUGmu0SC55K5gw.woff2 — 22.2 KiB — 28 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 10 ms
Start 338 ms
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 24 ms
Start 338 ms
Risk FOUT — text flashes from fallback to web font
S6u9w4BMUTPHh6UVSwiPGQ3... woff2 swap
Size 14 KB
Load time 27 ms
Start 338 ms
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 31 ms
Start 339 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 33 ms
Start 339 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 18 ms
Start 339 ms
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 22 KB
Load time 28 ms
Start 340 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
61 requests over 1391ms
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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s FCP 5.6 s LCP 48.1 shttps://ornl.gov// https://ornl.gov/ — 301 — 204 B — 21 ms — h2https://www.ornl.gov/www.ornl.gov/ https://www.ornl.gov/ — 200 — 15.5 KiB — 25 ms — h2https://www.ornl.gov/sites/default/files/css/css_j91sP-M1huywZEf5vKsWjop5RzzjNWx-4T6dKW5ciNI.css?delta=0&language=en&theme=ornl&include=eJx1kGGOAyEIhS_k6JEaVDqaOmAA03r7utvNbrKJvx68j0cIkLMx0AzwU_i7MJlLDVRnIM7oEguGxFdnQjL1LNSOIw4zpg1M0BoP29CCkFul3eaiR-Q8N_RR0wNlAwmfKww7bAiKsuRl7qpUWYBOvClcLfzrPeTluK9cOBtHaIfaXFefH--J8b4epd_dTREklfCR38EOAqdALxqyjA7N_zl-UB-xVS2YnU41vEJc170B9uOaxwwww.ornl.gov/sites/default/files/cs... https://www.ornl.gov/sites/default/files/css/css_j91sP-M1huywZEf5vKsWjop5RzzjNWx-4T6dKW5ciNI.css?delta=0&language=en&theme=ornl&include=eJx1kGGOAyEIhS_k6JEaVDqaOmAA03r7utvNbrKJvx68j0cIkLMx0AzwU_i7MJlLDVRnIM7oEguGxFdnQjL1LNSOIw4zpg1M0BoP29CCkFul3eaiR-Q8N_RR0wNlAwmfKww7bAiKsuRl7qpUWYBOvClcLfzrPeTluK9cOBtHaIfaXFefH--J8b4epd_dTREklfCR38EOAqdALxqyjA7N_zl-UB-xVS2YnU41vEJc170B9uOaxw — 200 — 4.3 KiB — 19 ms — h2https://www.ornl.gov/sites/default/files/css/css_ROl_CPO1oqaBgKFpuWfrPMHz5lvWQ4WCjnQ52RtMHz8.css?delta=1&language=en&theme=ornl&include=eJx1kGGOAyEIhS_k6JEaVDqaOmAA03r7utvNbrKJvx68j0cIkLMx0AzwU_i7MJlLDVRnIM7oEguGxFdnQjL1LNSOIw4zpg1M0BoP29CCkFul3eaiR-Q8N_RR0wNlAwmfKww7bAiKsuRl7qpUWYBOvClcLfzrPeTluK9cOBtHaIfaXFefH--J8b4epd_dTREklfCR38EOAqdALxqyjA7N_zl-UB-xVS2YnU41vEJc170B9uOaxwwww.ornl.gov/sites/default/files/cs... https://www.ornl.gov/sites/default/files/css/css_ROl_CPO1oqaBgKFpuWfrPMHz5lvWQ4WCjnQ52RtMHz8.css?delta=1&language=en&theme=ornl&include=eJx1kGGOAyEIhS_k6JEaVDqaOmAA03r7utvNbrKJvx68j0cIkLMx0AzwU_i7MJlLDVRnIM7oEguGxFdnQjL1LNSOIw4zpg1M0BoP29CCkFul3eaiR-Q8N_RR0wNlAwmfKww7bAiKsuRl7qpUWYBOvClcLfzrPeTluK9cOBtHaIfaXFefH--J8b4epd_dTREklfCR38EOAqdALxqyjA7N_zl-UB-xVS2YnU41vEJc170B9uOaxw — 200 — 48.3 KiB — 33 ms — h2https://fonts.googleapis.com/css?family=Roboto:100,100i,200,200i,300,300i,400,400i,500,600,700,900fonts.googleapis.com/css?family=Rob... https://fonts.googleapis.com/css?family=Roboto:100,100i,200,200i,300,300i,400,400i,500,600,700,900 — 200 — 2.5 KiB — 124 ms — h2https://fonts.googleapis.com/css?family=Oswald:200,300,400,500,600fonts.googleapis.com/css?family=Osw... https://fonts.googleapis.com/css?family=Oswald:200,300,400,500,600 — 200 — 765 B — 126 ms — h2https://fonts.googleapis.com/css?family=Open+Sans:300,300i,400,400i,500,600fonts.googleapis.com/css?family=Ope... 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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 2774ms · 899KB · $37/mo
Unattributable
Other
Costly
Execution 692ms
Transfer 0 KB
Monthly Cost $9/mo
www.ornl.gov
Other
Costly
Execution 533ms
Transfer 15 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 286ms
Transfer 147 KB
Unused 42%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 250ms
Transfer 158 KB
Unused 39%
Monthly Cost $3/mo
www.ornl.gov
Other
Costly
Execution 231ms
Transfer 1 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 200ms
Transfer 119 KB
Unused 52%
Monthly Cost $3/mo
use.fontawesome.com
Other
Optional
Execution 143ms
Transfer 248 KB
Monthly Cost $2/mo
dap.digitalgov.gov
Other
Optional
Execution 107ms
Transfer 4 KB
Monthly Cost $1/mo
siteimproveanalytics.com
Other
Optional
Execution 100ms
Transfer 21 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo
www.ornl.gov
Other
Optional
Execution 82ms
Transfer 4 KB
Monthly Cost $1/mo
www.ornl.gov
Other
Optional
Execution 61ms
Transfer 35 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 692ms and costs ~$9/month
  • www.ornl.gov adds 533ms and costs ~$7/month
  • Google Tag Manager adds 286ms and costs ~$4/month
  • Google Tag Manager adds 250ms and costs ~$3/month
  • www.ornl.gov adds 231ms and costs ~$3/month
  • Google Tag Manager adds 200ms 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

Unattributable takes 692ms 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.ornl.gov takes 533ms 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 286ms 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 250ms 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.ornl.gov 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

Google Tag Manager takes 200ms 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

52% 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

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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