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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
29
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.

5.44 s

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

10.93 s

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

2.35 s

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.

7.82 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.

20.60 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
3.0 MB transferred, 116 requests
FIX
3.0 MB transferred, 116 requests
Warning::
Page weighs 8.9 MB (3.0 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::
116 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.63 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
116 requests
0.63 g CO2 per page load
JavaScript 1.9 MiB 63%
Images 594.7 KiB 19%
CSS 163.5 KiB 5%
Other 130.1 KiB 4%
Other 88.1 KiB 3%
Fonts 71.2 KiB 2%
HTML 55.4 KiB 2%
Other 32.6 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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6573ms total JS execution
FIX
6573ms total JS execution
Warning::
https://www.st.com/etc/clientlibs/st-site-cx.min.3...: 1735ms CPU time
Warning::
https://cdn.decibelinsight.net/i/13951/335449/di.j...: 685ms CPU time
Warning::
https://www.st.com/L9Of/H6I-/ps/5urg/nvMA/3zYDkS2r...: 621ms CPU time
Warning::
https://www.st.com/content/st_com/en.html: 543ms CPU time
Warning::
https://www.st.com/etc.clientlibs/clientlibs/grani...: 525ms CPU time
Warning::
Third-party scripts: 6573ms (100% of total)

Main Thread Breakdown

Script Evaluation 72% Other 10% Script Parsing & Compilation 9% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://www.st.com/etc/clientlibs/st-site-cx.min.3102257c92a26417796eec1cc4af6c93.js1735ms1475ms218ms3rd
https://cdn.decibelinsight.net/i/13951/335449/di.js685ms573ms19ms3rd
https://www.st.com/L9Of/H6I-/ps/5urg/nvMA/3zYDkS2rSf4VJSz5/aioOJQUXBw/dAVoB/lk-JTUB621ms568ms38ms3rd
https://www.st.com/content/st_com/en.html543ms70ms24ms3rd
https://www.st.com/etc.clientlibs/clientlibs/granite/jquery.min.3e24d4d067ac58228b5004abb50344ef.js525ms436ms8ms3rd
Unattributable485ms46ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NMB29WK471ms430ms38ms3rd
https://search.st.com/widgets/searchbox/index.js342ms208ms118ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4V6BSG3B5Y&cx=c&gtm=4e64h1279ms240ms37ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-965727604&cx=c&gtm=4e64h1185ms156ms28ms3rd

Showing top 10 of 18 scripts

F
JS Bundles
Action
55 scripts, 815 KB unused
FIX
55 scripts, 815 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...: 58 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 815 KB
815 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 KB58 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 KB24 KB (82%)✓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
116 resources · 3.0 MB · 815 KB savings available
FIX
116 resources · 3.0 MB · 815 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~815 KB of savings available
Warning::
115 third-party resources (100% of weight)
Info::
1 resources over 200KB
116 resources · 3.0 MiB · 115 third-party 2.0 MiB over 1MB target
JavaScript 64% · 1.9 MiB
Image 22% · 682.7 KiB
CSS 5% · 163.5 KiB
Other 4% · 134.6 KiB
Font 2% · 71.2 KiB
Document 2% · 64.2 KiB

~814.5 KiB of savings available

Remove unused JavaScript: 814.5 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
B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 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.
12 images 595 KB
0 oversized -0 KB
4 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
2 fonts (71 KB)
PASS
2 fonts (71 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

71 KB total

Render-blocking

0

of 2

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 FCP 5.4 s LCP 10.9 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 — 59 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 — 47.9 KiB — 77 ms — font-display: swap
ITCLubalinGraphW03-Medi... woff2 swap
Size 23 KB
Load time 59 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
HelveticaNowDisplay-Med... woff2 swap
Size 48 KB
Load time 77 ms
Start 1.8 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
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
116 requests over 4070ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 5.4 s LCP 10.9 shttps://st.com// https://st.com/ — 301 — 389 B — 1.3 s — http/1.1https://www.st.com/www.st.com/ https://www.st.com/ — 301 — 4.5 KiB — 32 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 — 109 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 — 65.2 KiB — 173 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 — 96 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 — 59 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 — 81 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 — 62 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 — 64 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 — 66 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 — 67 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 — 68 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 — 69 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 — 70 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 — 48 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 — 57 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 — 49 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 — 50 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 — 70 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 — 51 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 — 71 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 — 52 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 — 74 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 — 72 ms — h2https://www.st.com/content/dam/st-crew/developer-zone/navigation/share-box-fill.pngwww.st.com/content/dam/st-crew/deve... https://www.st.com/content/dam/st-crew/developer-zone/navigation/share-box-fill.png — 200 — 3.9 KiB — 27 ms — h2https://www.st.com/etc.clientlibs/st-site-cx/components/general/navigation/navigation/navigation-clientlibs.min.f722bf2cde75c157af93fdb66a85156a.csswww.st.com/etc.clientlibs/st-site-c... https://www.st.com/etc.clientlibs/st-site-cx/components/general/navigation/navigation/navigation-clientlibs.min.f722bf2cde75c157af93fdb66a85156a.css — 200 — 5.1 KiB — 21 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 — 31 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 172 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 — 19 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 — 50 ms — h2
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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-4V6BSG3B5Y&gtm=45je64h1v9102181214z89112731032za20gzb9112731032zd9112731032&_p=1776816815558&em=tv.1~em.exf7C9Fz9iW1hjb7eWQHwis9Fvx4MC158P0wwvwvwGg&gcs=G100&gcd=13q3qPq2q5l1&npa=1&dma_cps=-&dma=1&ecid=861151741&_eu=EAAAAGA&are=1&cid=892807643.1776816817&ec_mode=a&frm=0&ir=1&pscdl=denied&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=2&tag_exp=0~115938465~115938469~117266401~117512542&dr=&sid=1776816816&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=2899region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-4V6BSG3B5Y&gtm=45je64h1v9102181214z89112731032za20gzb9112731032zd9112731032&_p=1776816815558&em=tv.1~em.exf7C9Fz9iW1hjb7eWQHwis9Fvx4MC158P0wwvwvwGg&gcs=G100&gcd=13q3qPq2q5l1&npa=1&dma_cps=-&dma=1&ecid=861151741&_eu=EAAAAGA&are=1&cid=892807643.1776816817&ec_mode=a&frm=0&ir=1&pscdl=denied&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=2&tag_exp=0~115938465~115938469~117266401~117512542&dr=&sid=1776816816&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=2899 — 204 — 48 B — 111 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 — 29 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 — 27 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 — 27 ms — h2blob:https://www.st.com/0539585a-9aad-43cb-9c1e-5e62abdc531fwww.st.com/0539585a-9aad-43cb-9c1e-... blob:https://www.st.com/0539585a-9aad-43cb-9c1e-5e62abdc531f — -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 — 4.4 KiB — 145 ms — h2https://0217991b.akstat.io/0217991b.akstat.io/ https://0217991b.akstat.io/ — 204 — 223 B — 367 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 6573ms · 1527KB · $87/mo
www.st.com
Other
Costly
Execution 1735ms
Transfer 525 KB
Unused 66%
Monthly Cost $23/mo
cdn.decibelinsight.net
Other
Costly
Execution 685ms
Transfer 65 KB
Unused 32%
Monthly Cost $9/mo
www.st.com
Other
Costly
Execution 621ms
Transfer 4 KB
Unused 21%
Monthly Cost $8/mo
www.st.com
Other
Costly
Execution 543ms
Transfer 55 KB
Monthly Cost $7/mo
www.st.com
Other
Costly
Execution 525ms
Transfer 39 KB
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 485ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 471ms
Transfer 167 KB
Unused 35%
Monthly Cost $6/mo
search.st.com
Other
Costly
Execution 342ms
Transfer 142 KB
Unused 39%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 279ms
Transfer 178 KB
Unused 37%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Optional
Execution 185ms
Transfer 147 KB
Unused 44%
Monthly Cost $2/mo
www.st.com
Other
Optional
Execution 154ms
Transfer 13 KB
Monthly Cost $2/mo
s2.go-mpulse.net
Other
Optional
Execution 133ms
Transfer 58 KB
Unused 43%
Monthly Cost $2/mo
www.st.com
Other
Optional
Execution 123ms
Transfer 7 KB
Monthly Cost $2/mo
www.st.com
Other
Optional
Execution 80ms
Transfer 99 KB
Unused 82%
Monthly Cost $1/mo
www.st.com
Other
Optional
Execution 56ms
Transfer 5 KB
Monthly Cost $1/mo
www.st.com
Other
Optional
Execution 55ms
Transfer 5 KB
Monthly Cost $1/mo
www.st.com
Other
Optional
Execution 51ms
Transfer 9 KB
Monthly Cost $1/mo
www.st.com
Other
Optional
Execution 51ms
Transfer 8 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.st.com adds 1735ms and costs ~$23/month
  • cdn.decibelinsight.net adds 685ms and costs ~$9/month
  • www.st.com adds 621ms and costs ~$8/month
  • www.st.com adds 543ms and costs ~$7/month
  • www.st.com adds 525ms and costs ~$7/month
  • Unattributable adds 485ms and costs ~$6/month
  • Google Tag Manager adds 471ms and costs ~$6/month
  • search.st.com adds 342ms and costs ~$5/month
  • Google Tag Manager adds 279ms 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

www.st.com takes 1735ms 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

cdn.decibelinsight.net takes 685ms 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.st.com takes 621ms 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.st.com takes 543ms 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.st.com takes 525ms 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 485ms 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 471ms 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

search.st.com takes 342ms 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 279ms 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

82% 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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