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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.
85
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.

942 ms

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

1.21 s

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

204 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.

1.21 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.

3.96 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 151 requests
FIX
3.0 MB transferred, 151 requests
Warning::
Page weighs 10.5 MB (3.0 MB transferred)
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Info::
Fonts are 273 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 273 KB
Info::
CSS is 265 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 265 KB
Warning::
151 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.62 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
151 requests
0.62 g CO2 per page load
JavaScript 2.1 MiB 71%
Fonts 272.9 KiB 9%
CSS 264.6 KiB 9%
Images 250.2 KiB 8%
HTML 40.1 KiB 1%
Other 34.0 KiB 1%
Other 3.9 KiB 0%
Other 2.9 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
95 scripts, 452 KB unused
FIX
95 scripts, 452 KB unused
Warning::
https://fast.wistia.com/assets/external/engines/hl...: 122 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://acsbapp.com/apps/app/dist/js/app.js: 114 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PBJ...: 81 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fast.wistia.com/assets/external/E-v1.js: 71 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.trustarc.com/asset/notice.js/v/v1....: 22 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 452 KB
452 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://fast.wistia.com/assets/external/engines/hls_video.js@379dc59f3883ecbd8a4ec99277538cfd8c619ee8159 KB122 KB (77%)✓3rd
https://acsbapp.com/apps/app/dist/js/app.js222 KB114 KB (53%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PBJ84RQ186 KB81 KB (44%)✓3rd
https://fast.wistia.com/assets/external/E-v1.js162 KB71 KB (44%)✓3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-172936 KB22 KB (60%)✓3rd
https://browser.sentry-cdn.com/9.6.1/bundle.min.js25 KB21 KB (86%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://www.ul.com/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.01 KB—✓3rd
https://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/js/mobile_menu.js?tdab902 KB—✓3rd
https://www.ul.com/core/misc/drupal.js?v=10.6.27 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
151 resources · 3.0 MB · 452 KB savings available
FIX
151 resources · 3.0 MB · 452 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~452 KB of savings available
Warning::
150 third-party resources (100% of weight)
Info::
3 resources over 200KB
151 resources · 3.0 MiB · 150 third-party 2.0 MiB over 1MB target
JavaScript 71% · 2.1 MiB
Font 9% · 272.9 KiB
CSS 9% · 264.6 KiB
Image 8% · 254.7 KiB
Document 1% · 42.0 KiB
Other 1% · 34.4 KiB

~452.3 KiB of savings available

Remove unused JavaScript: 452.3 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.

C
Image Optimization
Action
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://consent.trustarc.com/get?name=white_close_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ul.com/themes/custom/ul-com-theme/img/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 250 KB
0 oversized -0 KB
5 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 Execution Cost
Action
1499ms total JS execution
REVIEW
1499ms total JS execution
Warning::
https://fast.wistia.com/assets/external/E-v1.js: 522ms CPU time
Warning::
https://www.ul.com/: 311ms CPU time
Info::
Unattributable: 222ms CPU time
Info::
https://www.ul.com/profiles/custom/ul_base_profile...: 199ms CPU time
Info::
https://acsbapp.com/apps/app/dist/js/app.js: 98ms CPU time
Warning::
Third-party scripts: 1499ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 18% Style & Layout 14% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://fast.wistia.com/assets/external/E-v1.js522ms434ms23ms3rd
https://www.ul.com/311ms14ms0ms3rd
Unattributable222ms19ms0ms3rd
https://www.ul.com/profiles/custom/ul_base_profile/themes/custom/ul_base_theme/build/scripts/app.built.js?v=10.6.2199ms151ms47ms3rd
https://acsbapp.com/apps/app/dist/js/app.js98ms71ms14ms3rd
https://fast.wistia.com/assets/external/engines/hls_video.js@379dc59f3883ecbd8a4ec99277538cfd8c619ee878ms59ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PBJ84RQ70ms56ms13ms3rd
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
8 fonts (273 KB)
PASS
8 fonts (273 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

273 KB total

Render-blocking

0

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 942 ms LCP 1.2 shttps://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/Poppins/Poppins-Regular.woff2Poppins-Regular.woff2 https://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/Poppins/Poppins-Regular.woff2 — 50.3 KiB — 20 ms — font-display: swaphttps://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/Poppins/Poppins-Light.woff2Poppins-Light.woff2 https://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/Poppins/Poppins-Light.woff2 — 50.1 KiB — 6 ms — font-display: swaphttps://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/Poppins/Poppins-SemiBold.woff2Poppins-SemiBold.woff2 https://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/Poppins/Poppins-SemiBold.woff2 — 50.3 KiB — 38 ms — font-display: swaphttps://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/icomoon/icomoon.woff2icomoon.woff2 https://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/icomoon/icomoon.woff2 — 9.7 KiB — 24 ms — font-display: swaphttps://www.ul.com/profiles/custom/ul_base_profile/themes/custom/ul_base_theme/build/fonts/Poppins/Poppins-Regular.woff2Poppins-Regular.woff2 https://www.ul.com/profiles/custom/ul_base_profile/themes/custom/ul_base_theme/build/fonts/Poppins/Poppins-Regular.woff2 — 50.3 KiB — 20 ms — font-display: swaphttps://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/OpenSans/OpenSans-Regular.woff2OpenSans-Regular.woff2 https://www.ul.com/profiles/custom/ul_enterprise_profile/themes/custom/ul_enterprise_theme/build/fonts/OpenSans/OpenSans-Regular.woff2 — 30.4 KiB — 5 ms — font-display: swaphttps://www.ul.com/profiles/custom/ul_base_profile/themes/custom/ul_base_theme/build/fonts/OpenSans/OpenSans-Regular.woff2OpenSans-Regular.woff2 https://www.ul.com/profiles/custom/ul_base_profile/themes/custom/ul_base_theme/build/fonts/OpenSans/OpenSans-Regular.woff2 — 30.2 KiB — 7 ms — font-display: swapdata:application/x-font-woff;charset=utf-8;base64,d09GMk9UVE8AAAaMAAwAAAAACgAAAAZBAAMD1wAAAAAAAAAAA…x-font-woff;charset=utf... data:application/x-font-woff;charset=utf-8;base64,d09GMk9UVE8AAAaMAAwAAAAACgAAAAZBAAMD1wAAAAAAAAAAA… — 1.6 KiB — 15 ms — font-display: swap
Poppins-Regular.woff2 woff2 swap
Size 50 KB
Load time 20 ms
Start 157 ms
Risk FOUT — text flashes from fallback to web font
Poppins-Light.woff2 woff2 swap
Size 50 KB
Load time 6 ms
Start 205 ms
Risk FOUT — text flashes from fallback to web font
Poppins-SemiBold.woff2 woff2 swap
Size 50 KB
Load time 38 ms
Start 292 ms
Risk FOUT — text flashes from fallback to web font
icomoon.woff2 woff2 swap
Size 10 KB
Load time 24 ms
Start 292 ms
Risk FOUT — text flashes from fallback to web font
Poppins-Regular.woff2 woff2 swap
Size 50 KB
Load time 20 ms
Start 294 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Regular.woff2 woff2 swap
Size 30 KB
Load time 5 ms
Start 398 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Regular.woff2 woff2 swap
Size 30 KB
Load time 7 ms
Start 644 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff;charset=utf... woff swap
Size 2 KB
Load time 15 ms
Start 922 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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
151 requests over 6292ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 942 ms LCP 1.2 shttps://ul.com// https://ul.com/ — 301 — 203 B — 6 ms — h2https://www.ul.com/www.ul.com/ https://www.ul.com/ — 200 — 38.3 KiB — 12 ms — h2https://www.ul.com/sites/default/files/css/css_OKXzcFlaXFE_Wx84xPYnCST6VH9LZzy3_vBLFoyT7v8.css?delta=0&language=en&theme=ul_com_theme&include=eJxtUFGWgyAMvBDCxx7IFzEqbQBfEtq6p19Q-9rd7Q8kM5PJAIyjZkibg7OwE-ekxhOIbG4AwWcdUQRmFOMzoxu5rEAWLvA4gJQ5AoVvNPhQCun6lJytiTgGcFMgRbYeVg05mRUYZoZ1kaf8hdiS1jJQkAVHI1PvF1A3Ux6AjGQfgPrds2_24qaaG-4oOaL1Oa45YX3IB-F_yOqCEY1sohiPRxfq293vzLv3H-bI04luhNIRa-Pr-pMu1NXmpBtVMyGvHD4ZhDQ3SQS-omb3Kg-0DtbcX3uYrhrHPCKDdjeo-ED4W1VIOl9Ec2y4QN0_ZfYt0ltnGbVw2r-h6ZTrCLB3b7W9SOUHcwt4F7eftu4uhD-aX-Cywww.ul.com/sites/default/files/css/... https://www.ul.com/sites/default/files/css/css_OKXzcFlaXFE_Wx84xPYnCST6VH9LZzy3_vBLFoyT7v8.css?delta=0&language=en&theme=ul_com_theme&include=eJxtUFGWgyAMvBDCxx7IFzEqbQBfEtq6p19Q-9rd7Q8kM5PJAIyjZkibg7OwE-ekxhOIbG4AwWcdUQRmFOMzoxu5rEAWLvA4gJQ5AoVvNPhQCun6lJytiTgGcFMgRbYeVg05mRUYZoZ1kaf8hdiS1jJQkAVHI1PvF1A3Ux6AjGQfgPrds2_24qaaG-4oOaL1Oa45YX3IB-F_yOqCEY1sohiPRxfq293vzLv3H-bI04luhNIRa-Pr-pMu1NXmpBtVMyGvHD4ZhDQ3SQS-omb3Kg-0DtbcX3uYrhrHPCKDdjeo-ED4W1VIOl9Ec2y4QN0_ZfYt0ltnGbVw2r-h6ZTrCLB3b7W9SOUHcwt4F7eftu4uhD-aX-Cy — 200 — 12.2 KiB — 15 ms — h2https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/css/all.min.css — 200 — 18.9 KiB — 68 ms — h3https://www.ul.com/sites/default/files/css/css__Kfp3sTJ3xE_QtdC275n6UkaIH8QO11ydFFYj7J4bKk.css?delta=2&language=en&theme=ul_com_theme&include=eJxtUFGWgyAMvBDCxx7IFzEqbQBfEtq6p19Q-9rd7Q8kM5PJAIyjZkibg7OwE-ekxhOIbG4AwWcdUQRmFOMzoxu5rEAWLvA4gJQ5AoVvNPhQCun6lJytiTgGcFMgRbYeVg05mRUYZoZ1kaf8hdiS1jJQkAVHI1PvF1A3Ux6AjGQfgPrds2_24qaaG-4oOaL1Oa45YX3IB-F_yOqCEY1sohiPRxfq293vzLv3H-bI04luhNIRa-Pr-pMu1NXmpBtVMyGvHD4ZhDQ3SQS-omb3Kg-0DtbcX3uYrhrHPCKDdjeo-ED4W1VIOl9Ec2y4QN0_ZfYt0ltnGbVw2r-h6ZTrCLB3b7W9SOUHcwt4F7eftu4uhD-aX-Cywww.ul.com/sites/default/files/css/... https://www.ul.com/sites/default/files/css/css__Kfp3sTJ3xE_QtdC275n6UkaIH8QO11ydFFYj7J4bKk.css?delta=2&language=en&theme=ul_com_theme&include=eJxtUFGWgyAMvBDCxx7IFzEqbQBfEtq6p19Q-9rd7Q8kM5PJAIyjZkibg7OwE-ekxhOIbG4AwWcdUQRmFOMzoxu5rEAWLvA4gJQ5AoVvNPhQCun6lJytiTgGcFMgRbYeVg05mRUYZoZ1kaf8hdiS1jJQkAVHI1PvF1A3Ux6AjGQfgPrds2_24qaaG-4oOaL1Oa45YX3IB-F_yOqCEY1sohiPRxfq293vzLv3H-bI04luhNIRa-Pr-pMu1NXmpBtVMyGvHD4ZhDQ3SQS-omb3Kg-0DtbcX3uYrhrHPCKDdjeo-ED4W1VIOl9Ec2y4QN0_ZfYt0ltnGbVw2r-h6ZTrCLB3b7W9SOUHcwt4F7eftu4uhD-aX-Cy — 200 — 28.7 KiB — 12 ms — h2https://www.ul.com/sites/default/files/css/css_4PArO1oMAKRxeqUi1TfcT3MD3Ia48CNTpI8e1VQ26po.css?delta=3&language=en&theme=ul_com_theme&include=eJxtUFGWgyAMvBDCxx7IFzEqbQBfEtq6p19Q-9rd7Q8kM5PJAIyjZkibg7OwE-ekxhOIbG4AwWcdUQRmFOMzoxu5rEAWLvA4gJQ5AoVvNPhQCun6lJytiTgGcFMgRbYeVg05mRUYZoZ1kaf8hdiS1jJQkAVHI1PvF1A3Ux6AjGQfgPrds2_24qaaG-4oOaL1Oa45YX3IB-F_yOqCEY1sohiPRxfq293vzLv3H-bI04luhNIRa-Pr-pMu1NXmpBtVMyGvHD4ZhDQ3SQS-omb3Kg-0DtbcX3uYrhrHPCKDdjeo-ED4W1VIOl9Ec2y4QN0_ZfYt0ltnGbVw2r-h6ZTrCLB3b7W9SOUHcwt4F7eftu4uhD-aX-Cywww.ul.com/sites/default/files/css/... 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https://fast.wistia.com/assets/external/engines/hls_video.js@379dc59f3883ecbd8a4ec99277538cfd8c619ee8 — 200 — 159.2 KiB — 14 ms — h2https://consent.trustarc.com/analytics?action=1&domain=ulsolutionsweb.com&implied=1&session=b7ebdb026b514dfaa35a5f1b7faa2852&new=1&referer=https://www.ul.comconsent.trustarc.com/analytics?acti... https://consent.trustarc.com/analytics?action=1&domain=ulsolutionsweb.com&implied=1&session=b7ebdb026b514dfaa35a5f1b7faa2852&new=1&referer=https://www.ul.com — 200 — 465 B — 43 ms — h2https://consent.trustarc.com/get?name=white_close_button.pngconsent.trustarc.com/get?name=white... https://consent.trustarc.com/get?name=white_close_button.png — 200 — 886 B — 14 ms — h2https://www.ul.com/themes/custom/ul-com-theme/favicon.icowww.ul.com/themes/custom/ul-com-the... https://www.ul.com/themes/custom/ul-com-theme/favicon.ico — 200 — 3.7 KiB — 6 ms — h2https://fast.wistia.com/assets/images/blank.giffast.wistia.com/assets/images/blank... https://fast.wistia.com/assets/images/blank.gif — 200 — 1.4 KiB — 2 ms — h2https://fast.wistia.com/embed/medias/1hlg5eyj20.m3u8fast.wistia.com/embed/medias/1hlg5e... https://fast.wistia.com/embed/medias/1hlg5eyj20.m3u8 — 200 — 1.9 KiB — 2 ms — h2https://distillery.wistia.com/xdistillery.wistia.com/x https://distillery.wistia.com/x — 204 — 292 B — 168 ms — h2https://pipedream.wistia.com/mput?topic=metricspipedream.wistia.com/mput?topic=met... https://pipedream.wistia.com/mput?topic=metrics — 200 — 334 B — 148 ms — h2https://pipedream.wistia.com/mput?topic=metricspipedream.wistia.com/mput?topic=met... https://pipedream.wistia.com/mput?topic=metrics — 200 — 333 B — 110 ms — h2https://fast.wistia.com/assets/external/allIntegrations.js@379dc59f3883ecbd8a4ec99277538cfd8c619ee8fast.wistia.com/assets/external/all... https://fast.wistia.com/assets/external/allIntegrations.js@379dc59f3883ecbd8a4ec99277538cfd8c619ee8 — 200 — 16.1 KiB — 3 ms — h2https://pipedream.wistia.com/mput?topic=metricspipedream.wistia.com/mput?topic=met... https://pipedream.wistia.com/mput?topic=metrics — 200 — 332 B — 105 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/js/bootstrap.min.js?_=1776813647478ulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/js/bootstrap.min.js?_=1776813647478 — 200 — 26.3 KiB — 320 ms — h2https://acsbapp.com/apps/app/dist/js/app.jsacsbapp.com/apps/app/dist/js/app.js https://acsbapp.com/apps/app/dist/js/app.js — 200 — 221.9 KiB — 136 ms — h2https://cdn.acsbapp.com/config/ul.com/config.jsoncdn.acsbapp.com/config/ul.com/confi... https://cdn.acsbapp.com/config/ul.com/config.json — 200 — 724 B — 166 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/styles/bootstrap.min.cssulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/styles/bootstrap.min.css — 200 — 3.0 KiB — 170 ms — h2https://ulenterpriseorg.my.salesforce-scrt.com/embeddedservice/v1/embedded-service-config?orgId=00D4x00000676e4&esConfigName=UL_Digital_Assistant_Embedded_Service&language=en_USulenterpriseorg.my.salesforce-scrt.... https://ulenterpriseorg.my.salesforce-scrt.com/embeddedservice/v1/embedded-service-config?orgId=00D4x00000676e4&esConfigName=UL_Digital_Assistant_Embedded_Service&language=en_US — 200 — 23.5 KiB — 444 ms — h2https://ulenterpriseorg.my.salesforce-scrt.com/embeddedservice/v1/businesshours?orgId=00D4x00000676e4&esConfigName=UL_Digital_Assistant_Embedded_Serviceulenterpriseorg.my.salesforce-scrt.... https://ulenterpriseorg.my.salesforce-scrt.com/embeddedservice/v1/businesshours?orgId=00D4x00000676e4&esConfigName=UL_Digital_Assistant_Embedded_Service — 204 — 240 B — 344 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/htdocs/sitecontext.min.html?parent_domain=https%3A%2F%2Fwww.ul.comulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/htdocs/sitecontext.min.html?parent_domain=https%3A%2F%2Fwww.ul.com — 200 — 907 B — 193 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/js/sitecontext.min.jsulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/js/sitecontext.min.js — 200 — 1.6 KiB — 206 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/?lwc.mode=prod&lwr.linkHeaders=trueulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/?lwc.mode=prod&lwr.linkHeaders=true — 200 — 1.8 KiB — 191 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/js/inert.min.jsulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/assets/js/inert.min.js — 200 — 2.7 KiB — 164 ms — h2https://www.ul.com/themes/custom/ul-com-theme/img/chat/chat_icon.pngwww.ul.com/themes/custom/ul-com-the... https://www.ul.com/themes/custom/ul-com-theme/img/chat/chat_icon.png — 200 — 5.4 KiB — 5 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/f005680334/prod/lwr_loaderulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/f005680334/prod/lwr_loader — 200 — 8.4 KiB — 18 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/45dbd95ddc/prod/lwr_bootstrapulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/45dbd95ddc/prod/lwr_bootstrap — 200 — 27.5 KiB — 18 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/9f4b4f0eed/prod/lwr_app_bootstrap_hookulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/9f4b4f0eed/prod/lwr_app_bootstrap_hook — 200 — 4.7 KiB — 36 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/b8d68ec341/prod/lwr_lwculenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/b8d68ec341/prod/lwr_lwc — 200 — 29.6 KiB — 39 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/32066829d2/prod/lwr_appulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/framework/32066829d2/prod/lwr_app — 200 — 76.9 KiB — 42 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/view/82436c2591336865a887377d22b80e38/prod/en-US/home_viewulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/view/82436c2591336865a887377d22b80e38/prod/en-US/home_view — 200 — 382.9 KiB — 52 ms — h2https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/component/259a789b5905e4a3e65c0942cc97421d/prod/en-US/force/luvioLwcBindings_cmpulenterpriseorg.my.site.com/ESWULDi... https://ulenterpriseorg.my.site.com/ESWULDigitalAssistantE1715867975271/webruntime/component/259a789b5905e4a3e65c0942cc97421d/prod/en-US/force/luvioLwcBindings_cmp — 200 — 2.0 KiB — 46 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 1499ms · 1275KB · €26/mo
fast.wistia.com
Other
Costly
Execution 522ms
Transfer 162 KB
Unused 44%
Monthly Cost €9/mo
www.ul.com
Other
Costly
Execution 311ms
Transfer 38 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 222ms
Transfer 0 KB
Monthly Cost €4/mo
www.ul.com
Other
Optional
Execution 199ms
Transfer 508 KB
Monthly Cost €3/mo
acsbapp.com
Other
Optional
Execution 98ms
Transfer 222 KB
Unused 53%
Monthly Cost €2/mo
fast.wistia.com
Other
Optional
Execution 78ms
Transfer 159 KB
Unused 77%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 70ms
Transfer 186 KB
Unused 44%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • fast.wistia.com adds 522ms and costs ~€9/month
  • www.ul.com adds 311ms and costs ~€5/month
  • Unattributable adds 222ms and costs ~€4/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

fast.wistia.com takes 522ms 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.ul.com takes 311ms 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 222ms 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

53% of acsbapp.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

77% of fast.wistia.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

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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