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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

2.45 s

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

3.67 s

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

147 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.

2.95 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.

5.74 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
3.4 MB transferred, 127 requests
FIX
3.4 MB transferred, 127 requests
Warning::
Page weighs 9.3 MB (3.4 MB transferred)
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Warning::
127 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.70 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
127 requests
0.70 g CO2 per page load
JavaScript 1.9 MiB 56%
Images 880.3 KiB 26%
CSS 164.0 KiB 5%
Fonts 150.9 KiB 4%
Other 130.3 KiB 4%
Other 88.1 KiB 3%
HTML 55.4 KiB 2%
Other 33.1 KiB 1%
Other 223 B 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

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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
55 scripts, 794 KB unused
FIX
55 scripts, 794 KB unused
Warning::
https://www.st.com/etc/clientlibs/st-site-cx.min.3...: 344 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.st.com/etc/clientlibs/st-site-cx.min.3...: unminified — 217 KB could be saved
Warning::
https://www.st.com/etc/designs/st-search-cx/search...: 78 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4V6B...: 67 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-965...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NMB...: 59 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 794 KB
794 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.st.com/etc/clientlibs/st-site-cx.min.3102257c92a26417796eec1cc4af6c93.js525 KB344 KB (66%)✗3rd
https://www.st.com/etc/designs/st-search-cx/search.min.446389ae6cfe152dcc0cc3a39c908e18.js99 KB78 KB (82%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-4V6BSG3B5Y&cx=c&gtm=4e64h1178 KB67 KB (37%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-965727604&cx=c&gtm=4e64h1147 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NMB29WK167 KB59 KB (35%)✓3rd
https://search.st.com/widgets/searchbox/index.js142 KB55 KB (39%)✓3rd
https://www.st.com/etc/clientlibs/st-search-cx/stangularjs.min.901dd2b30b4f1cf4319a2be2b8f56dd4.js66 KB42 KB (67%)✓3rd
https://www.st.com/L9Of/H6I-/ps/5urg/nvMA/3zYDkS2rSf4VJSz5/aioOJQUXBw/dAVoB/lk-JTUB183 KB38 KB (21%)✓3rd
https://s2.go-mpulse.net/boomerang/VQ4BN-JKJ9P-N5ULX-3L5VG-3UADM58 KB25 KB (43%)✓3rd
https://www.st.com/etc/clientlibs/st-site/libs/dataTables.min.15d1ef4b86c76cc17db7bad9da5bb0ea.js33 KB23 KB (79%)✓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
127 resources · 3.4 MB · 794 KB savings available
FIX
127 resources · 3.4 MB · 794 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~794 KB of savings available
Warning::
126 third-party resources (100% of weight)
Info::
3 resources over 200KB
127 resources · 3.4 MiB · 126 third-party 2.4 MiB over 1MB target
JavaScript 57% · 1.9 MiB
Image 28% · 968.3 KiB
CSS 5% · 164.0 KiB
Font 4% · 150.9 KiB
Other 4% · 135.3 KiB
Document 2% · 64.2 KiB

~794.0 KiB of savings available

Remove unused JavaScript: 794.0 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
C
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://www.st.com/content/dam/st-crew/st-logo-blu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.st.com/content/dam/0hp/2026-04/upcomin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.st.com/content/dam/0hp/2026-04/upcomin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.st.com/content/dam/0hp/2026-04/upcomin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 880 KB
0 oversized -0 KB
6 legacy format
4 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

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
1326ms total JS execution
REVIEW
1326ms total JS execution
Info::
https://www.st.com/content/st_com/en.html: 204ms CPU time
Info::
https://www.st.com/etc/clientlibs/st-site-cx.min.3...: 181ms CPU time
Info::
https://www.st.com/L9Of/H6I-/ps/5urg/nvMA/3zYDkS2r...: 172ms CPU time
Info::
Unattributable: 139ms CPU time
Info::
https://cdn.decibelinsight.net/i/13951/335449/di.j...: 138ms CPU time
Warning::
Third-party scripts: 1326ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 12% Style & Layout 10% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.st.com/content/st_com/en.html204ms22ms3ms3rd
https://www.st.com/etc/clientlibs/st-site-cx.min.3102257c92a26417796eec1cc4af6c93.js181ms101ms64ms3rd
https://www.st.com/L9Of/H6I-/ps/5urg/nvMA/3zYDkS2rSf4VJSz5/aioOJQUXBw/dAVoB/lk-JTUB172ms153ms16ms3rd
Unattributable139ms11ms0ms3rd
https://cdn.decibelinsight.net/i/13951/335449/di.js138ms132ms4ms3rd
https://www.st.com/etc.clientlibs/clientlibs/granite/jquery.min.3e24d4d067ac58228b5004abb50344ef.js129ms110ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NMB29WK111ms92ms9ms3rd
https://search.st.com/widgets/searchbox/index.js77ms52ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4V6BSG3B5Y&cx=c&gtm=4e64h169ms59ms10ms3rd
https://www.st.com/astatic/onetrust/st/OneTrust.min.js54ms53ms0ms3rd

Showing top 10 of 11 scripts

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
3 fonts (151 KB)
PASS
3 fonts (151 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

151 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 1.0 s 2.0 s 3.0 s FCP 2.5 s LCP 3.7 shttps://www.st.com/etc/clientlibs/st-site-cx/components/home-only-fonts/media/app/fonts/ITCLubalinGraphW03-Medium.woff2ITCLubalinGraphW03-Medi... https://www.st.com/etc/clientlibs/st-site-cx/components/home-only-fonts/media/app/fonts/ITCLubalinGraphW03-Medium.woff2 — 23.3 KiB — 119 ms — font-display: swaphttps://www.st.com/etc/clientlibs/st-site-cx/components/home-only-fonts/media/app/fonts/HelveticaNowDisplay-Medium.woff2HelveticaNowDisplay-Med... https://www.st.com/etc/clientlibs/st-site-cx/components/home-only-fonts/media/app/fonts/HelveticaNowDisplay-Medium.woff2 — 48.4 KiB — 51 ms — font-display: swaphttps://www.st.com/etc/clientlibs/st-site-cx/components/font-awesome/media/app/fonts/fontawesome-webfont.woff2fontawesome-webfont.woff2 https://www.st.com/etc/clientlibs/st-site-cx/components/font-awesome/media/app/fonts/fontawesome-webfont.woff2 — 79.1 KiB — 34 ms — font-display: swap
ITCLubalinGraphW03-Medi... woff2 swap
Size 23 KB
Load time 119 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
HelveticaNowDisplay-Med... woff2 swap
Size 48 KB
Load time 51 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 79 KB
Load time 34 ms
Start 2.2 s
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
127 requests over 4098ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.5 s LCP 3.7 shttps://st.com// https://st.com/ — 301 — 389 B — 1.4 s — http/1.1https://www.st.com/www.st.com/ https://www.st.com/ — 301 — 4.5 KiB — 82 ms — h2https://www.st.com/content/st_com/en.htmlwww.st.com/content/st_com/en.html https://www.st.com/content/st_com/en.html — 200 — 55.4 KiB — 56 ms — h2https://cdn.decibelinsight.net/i/13951/335449/di.jscdn.decibelinsight.net/i/13951/3354... https://cdn.decibelinsight.net/i/13951/335449/di.js — 200 — 65.3 KiB — 337 ms — h2https://assets.st.com/s7viewers/html5/js/VideoViewer.jsassets.st.com/s7viewers/html5/js/Vi... https://assets.st.com/s7viewers/html5/js/VideoViewer.js — 200 — 9.2 KiB — 80 ms — h2https://www.st.com/etc/clientlibs/st-site-cx/components/home-only-fonts/media/app/fonts/ITCLubalinGraphW03-Medium.woff2www.st.com/etc/clientlibs/st-site-c... https://www.st.com/etc/clientlibs/st-site-cx/components/home-only-fonts/media/app/fonts/ITCLubalinGraphW03-Medium.woff2 — 200 — 23.3 KiB — 119 ms — h2https://www.st.com/etc.clientlibs/clientlibs/granite/jquery.min.3e24d4d067ac58228b5004abb50344ef.jswww.st.com/etc.clientlibs/clientlib... https://www.st.com/etc.clientlibs/clientlibs/granite/jquery.min.3e24d4d067ac58228b5004abb50344ef.js — 200 — 39.1 KiB — 145 ms — h2https://www.st.com/etc.clientlibs/clientlibs/granite/utils.min.3b86602c4e1e0b41d9673f674a75cd4b.jswww.st.com/etc.clientlibs/clientlib... https://www.st.com/etc.clientlibs/clientlibs/granite/utils.min.3b86602c4e1e0b41d9673f674a75cd4b.js — 200 — 7.1 KiB — 146 ms — h2https://www.st.com/etc.clientlibs/clientlibs/granite/jquery/granite.min.011c0fc0d0cf131bdff879743a353002.jswww.st.com/etc.clientlibs/clientlib... https://www.st.com/etc.clientlibs/clientlibs/granite/jquery/granite.min.011c0fc0d0cf131bdff879743a353002.js — 200 — 5.4 KiB — 148 ms — h2https://www.st.com/etc.clientlibs/foundation/clientlibs/jquery.min.dd9b395c741ce2784096e26619e14910.jswww.st.com/etc.clientlibs/foundatio... https://www.st.com/etc.clientlibs/foundation/clientlibs/jquery.min.dd9b395c741ce2784096e26619e14910.js — 200 — 3.8 KiB — 149 ms — h2https://www.st.com/astatic/onetrust/st/OneTrust.min.jswww.st.com/astatic/onetrust/st/OneT... https://www.st.com/astatic/onetrust/st/OneTrust.min.js — 200 — 6.9 KiB — 151 ms — h2https://www.st.com/etc/clientlibs/st-site-cx/js/st-utils.jswww.st.com/etc/clientlibs/st-site-c... https://www.st.com/etc/clientlibs/st-site-cx/js/st-utils.js — 200 — 6.8 KiB — 152 ms — h2https://www.st.com/etc.clientlibs/foundation/clientlibs/shared.min.5bb9fccfb85f4e741d04d8fc44341a28.jswww.st.com/etc.clientlibs/foundatio... https://www.st.com/etc.clientlibs/foundation/clientlibs/shared.min.5bb9fccfb85f4e741d04d8fc44341a28.js — 200 — 10.9 KiB — 154 ms — h2https://www.st.com/etc/clientlibs/st-site-cx/components/st-app-head-utils.min.5504b25c1ff62db133b9b96def2ef7b8.jswww.st.com/etc/clientlibs/st-site-c... https://www.st.com/etc/clientlibs/st-site-cx/components/st-app-head-utils.min.5504b25c1ff62db133b9b96def2ef7b8.js — 200 — 4.0 KiB — 155 ms — h2https://www.st.com/etc/clientlibs/st-crew-header-footer.min.647d68e359d237e9124a2bd43a8a1a6f.csswww.st.com/etc/clientlibs/st-crew-h... https://www.st.com/etc/clientlibs/st-crew-header-footer.min.647d68e359d237e9124a2bd43a8a1a6f.css — 200 — 25.9 KiB — 107 ms — h2https://www.st.com/etc/clientlibs/st-crew.min.5f656be71d1f8ed511370bd0611fb4fd.csswww.st.com/etc/clientlibs/st-crew.m... https://www.st.com/etc/clientlibs/st-crew.min.5f656be71d1f8ed511370bd0611fb4fd.css — 200 — 46.3 KiB — 119 ms — h2https://www.st.com/etc/designs/st-search-cx/search.min.721107fd235b8929aa6d3078bbc38e01.csswww.st.com/etc/designs/st-search-cx... https://www.st.com/etc/designs/st-search-cx/search.min.721107fd235b8929aa6d3078bbc38e01.css — 200 — 10.8 KiB — 109 ms — h2https://www.st.com/etc.clientlibs/st-site-cx/components/general/header/clientlib.min.b14dc6dcb20ebc69647ecbcce3343297.csswww.st.com/etc.clientlibs/st-site-c... https://www.st.com/etc.clientlibs/st-site-cx/components/general/header/clientlib.min.b14dc6dcb20ebc69647ecbcce3343297.css — 200 — 4.3 KiB — 109 ms — h2https://www.st.com/etc.clientlibs/st-site-cx/components/general/header/clientlib.min.e3be90c2df95a3a3a8ce71dec620facb.jswww.st.com/etc.clientlibs/st-site-c... https://www.st.com/etc.clientlibs/st-site-cx/components/general/header/clientlib.min.e3be90c2df95a3a3a8ce71dec620facb.js — 200 — 4.8 KiB — 154 ms — h2https://www.st.com/etc.clientlibs/st-site-cx/components/general/header/sub-header-devzone/clientlibs.min.f5390245b19871ed7e61cfbe11031780.csswww.st.com/etc.clientlibs/st-site-c... https://www.st.com/etc.clientlibs/st-site-cx/components/general/header/sub-header-devzone/clientlibs.min.f5390245b19871ed7e61cfbe11031780.css — 200 — 4.7 KiB — 110 ms — h2https://www.st.com/etc.clientlibs/st-site-cx/components/general/header/sub-header-devzone/clientlibs.min.05f4a4476fbe89cbc3459fe3dc0004ed.jswww.st.com/etc.clientlibs/st-site-c... https://www.st.com/etc.clientlibs/st-site-cx/components/general/header/sub-header-devzone/clientlibs.min.05f4a4476fbe89cbc3459fe3dc0004ed.js — 200 — 5.1 KiB — 156 ms — h2https://www.st.com/etc/clientlibs/st-site-cx/components/header.min.0a833099709011ed4757b6c9d96e3016.csswww.st.com/etc/clientlibs/st-site-c... https://www.st.com/etc/clientlibs/st-site-cx/components/header.min.0a833099709011ed4757b6c9d96e3016.css — 200 — 11.6 KiB — 111 ms — h2https://www.st.com/content/dam/st-crew/developer-zone/navigation/home-2-line.pngwww.st.com/content/dam/st-crew/deve... https://www.st.com/content/dam/st-crew/developer-zone/navigation/home-2-line.png — 200 — 3.9 KiB — 156 ms — h2https://www.st.com/content/dam/st-crew/developer-zone/navigation/home-2-fill.pngwww.st.com/content/dam/st-crew/deve... https://www.st.com/content/dam/st-crew/developer-zone/navigation/home-2-fill.png — 200 — 3.9 KiB — 159 ms — h2https://www.st.com/libs/granite/csrf/token.jsonwww.st.com/libs/granite/csrf/token.... https://www.st.com/libs/granite/csrf/token.json — 200 — 4.1 KiB — 23 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 158 ms — https://www.st.com/bin/st/one-trust-integration.jsonwww.st.com/bin/st/one-trust-integra... https://www.st.com/bin/st/one-trust-integration.json — 200 — 4.7 KiB — 43 ms — h2https://s2.go-mpulse.net/boomerang/VQ4BN-JKJ9P-N5ULX-3L5VG-3UADMs2.go-mpulse.net/boomerang/VQ4BN-JK... https://s2.go-mpulse.net/boomerang/VQ4BN-JKJ9P-N5ULX-3L5VG-3UADM — 200 — 58.4 KiB — 46 ms — h2https://www.st.com/content/dam/st-crew/developer-zone/navigation/share-box-fill.pngwww.st.com/content/dam/st-crew/deve... 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-4V6BSG3B5Y&gtm=45je64h1v9102181214z89112731032za20gzb9112731032zd9112731032&_p=1776816840640&em=tv.1~em.exf7C9Fz9iW1hjb7eWQHwis9Fvx4MC158P0wwvwvwGg&gcs=G100&gcd=13q3qPq2q5l1&npa=1&dma_cps=-&dma=1&ecid=1293059250&_eu=EAAAAGA&are=1&cid=1117427717.1776816842&ec_mode=a&frm=0&ir=1&pscdl=denied&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115938465~115938468~117266401~117512543~118463261&dr=&sid=1776816841&sct=1&seg=0&dl=https%3A%2F%2Fwww.st.com%2Fcontent%2Fst_com%2Fen.html&dt=STMicroelectronics%3A%20Our%20technology%20starts%20with%20you&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.breadcrumb=none&ep.pagename=ST%20Home&ep.pageShortName=none&ep.primaryCategory=STMicroelectronics%20Home&ep.product_tree_level6=none&ep.product_tree_level1=none&ep.product_tree_level2=none&ep.product_tree_level3=none&ep.product_tree_level4=none&ep.product_tree_level5=none&ep.application_level0=none&ep.application_level1=none&ep.application_level2=none&ep.application_level3=none&ep.application_level4=none&ep.page_type=ST%20Home&ep.page_language=en&tfd=2850region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-4V6BSG3B5Y&gtm=45je64h1v9102181214z89112731032za20gzb9112731032zd9112731032&_p=1776816840640&em=tv.1~em.exf7C9Fz9iW1hjb7eWQHwis9Fvx4MC158P0wwvwvwGg&gcs=G100&gcd=13q3qPq2q5l1&npa=1&dma_cps=-&dma=1&ecid=1293059250&_eu=EAAAAGA&are=1&cid=1117427717.1776816842&ec_mode=a&frm=0&ir=1&pscdl=denied&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115938465~115938468~117266401~117512543~118463261&dr=&sid=1776816841&sct=1&seg=0&dl=https%3A%2F%2Fwww.st.com%2Fcontent%2Fst_com%2Fen.html&dt=STMicroelectronics%3A%20Our%20technology%20starts%20with%20you&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.breadcrumb=none&ep.pagename=ST%20Home&ep.pageShortName=none&ep.primaryCategory=STMicroelectronics%20Home&ep.product_tree_level6=none&ep.product_tree_level1=none&ep.product_tree_level2=none&ep.product_tree_level3=none&ep.product_tree_level4=none&ep.product_tree_level5=none&ep.application_level0=none&ep.application_level1=none&ep.application_level2=none&ep.application_level3=none&ep.application_level4=none&ep.page_type=ST%20Home&ep.page_language=en&tfd=2850 — 204 — 48 B — 101 ms — h2https://www.st.com/libs/granite/csrf/token.jsonwww.st.com/libs/granite/csrf/token.... https://www.st.com/libs/granite/csrf/token.json — 200 — 4.2 KiB — 32 ms — h2https://c.go-mpulse.net/api/config.json?key=VQ4BN-JKJ9P-N5ULX-3L5VG-3UADM&d=www.st.com&t=5922723&v=1.766.0&sl=0&si=36ee3e71-ae98-4416-b512-2da47ec8cab6-tdvcnb&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,Early,EventTiming,LOGN&acao=&ak.ai=681189c.go-mpulse.net/api/config.json?key... https://c.go-mpulse.net/api/config.json?key=VQ4BN-JKJ9P-N5ULX-3L5VG-3UADM&d=www.st.com&t=5922723&v=1.766.0&sl=0&si=36ee3e71-ae98-4416-b512-2da47ec8cab6-tdvcnb&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,Early,EventTiming,LOGN&acao=&ak.ai=681189 — 200 — 1.6 KiB — 263 ms — h2https://www.st.com/etc/clientlibs/st-site/media/app/images/favicon.icowww.st.com/etc/clientlibs/st-site/m... https://www.st.com/etc/clientlibs/st-site/media/app/images/favicon.ico — 200 — 4.1 KiB — 75 ms — h2https://www.st.com/etc/clientlibs/st-site/media/app/images/favicon-32.pngwww.st.com/etc/clientlibs/st-site/m... https://www.st.com/etc/clientlibs/st-site/media/app/images/favicon-32.png — 200 — 3.9 KiB — 29 ms — h2blob:https://www.st.com/52bb47e5-4f23-4861-9dab-ecc1e9c793b5www.st.com/52bb47e5-4f23-4861-9dab-... blob:https://www.st.com/52bb47e5-4f23-4861-9dab-ecc1e9c793b5 — -1 — 0 B — 0 ms — https://www.st.com/L9Of/H6I-/ps/5urg/nvMA/3zYDkS2rSf4VJSz5/aioOJQUXBw/dAVoB/lk-JTUBwww.st.com/L9Of/H6I-/ps/5urg/nvMA/3... https://www.st.com/L9Of/H6I-/ps/5urg/nvMA/3zYDkS2rSf4VJSz5/aioOJQUXBw/dAVoB/lk-JTUB — 201 — 4.5 KiB — 152 ms — h2https://trial-eum-clientnsv4-s.akamaihd.net/eum/getdns.txt?c=pxa7ticyvtrial-eum-clientnsv4-s.akamaihd.net... https://trial-eum-clientnsv4-s.akamaihd.net/eum/getdns.txt?c=pxa7ticyv — 302 — 266 B — 39 ms — http/1.1https://trial-eum-clienttons-s.akamaihd.net/eum/getdns.txt?c=pxa7ticyvtrial-eum-clienttons-s.akamaihd.net... https://trial-eum-clienttons-s.akamaihd.net/eum/getdns.txt?c=pxa7ticyv — 302 — 278 B — 55 ms — http/1.1https://rxr3y6accrd6u2piclfa-pxa7ti-87291b1d1-clientnsv4-s.akamaihd.net/eum/results.txtrxr3y6accrd6u2piclfa-pxa7ti-87291b1... https://rxr3y6accrd6u2piclfa-pxa7ti-87291b1d1-clientnsv4-s.akamaihd.net/eum/results.txt — 200 — 312 B — 53 ms — http/1.1https://eaauduflaaaaakqce3ychaaaanu6qewk-pxa7ti-8e457b631-clienttons-s.akamaihd.net/eum/results.txteaauduflaaaaakqce3ychaaaanu6qewk-px... https://eaauduflaaaaakqce3ychaaaanu6qewk-pxa7ti-8e457b631-clienttons-s.akamaihd.net/eum/results.txt — 200 — 312 B — 58 ms — http/1.1https://02179913.akstat.io/02179913.akstat.io/ https://02179913.akstat.io/ — 204 — 223 B — 360 ms — h2
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 1326ms · 1196KB · $18/mo
www.st.com
Other
Costly
Execution 204ms
Transfer 55 KB
Monthly Cost $3/mo
www.st.com
Other
Optional
Execution 181ms
Transfer 525 KB
Unused 66%
Monthly Cost $2/mo
www.st.com
Other
Optional
Execution 172ms
Transfer 4 KB
Unused 21%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 139ms
Transfer 0 KB
Monthly Cost $2/mo
cdn.decibelinsight.net
Other
Optional
Execution 138ms
Transfer 65 KB
Monthly Cost $2/mo
www.st.com
Other
Optional
Execution 129ms
Transfer 39 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 111ms
Transfer 167 KB
Unused 35%
Monthly Cost $1/mo
search.st.com
Other
Optional
Execution 77ms
Transfer 142 KB
Unused 39%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 69ms
Transfer 178 KB
Unused 37%
Monthly Cost $1/mo
www.st.com
Other
Optional
Execution 54ms
Transfer 7 KB
Monthly Cost $1/mo
www.st.com
Other
Optional
Execution 51ms
Transfer 13 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.st.com adds 204ms 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.st.com takes 204ms 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

66% of www.st.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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