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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
6
REVIEW
7
PASS
10
INFO
3

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

Mobile Desktop
37
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.
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.

6.67 s

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

19.27 s

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

710 ms

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

0.073

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

11.94 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.

19.78 s

Page Load Progression

523 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.7 s
4.2 s
Checks
26
10 PASS 7 REVIEW 6 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 117 requests
FIX
3.4 MB transferred, 117 requests
Warning::
Page weighs 10.3 MB (3.4 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
CSS is 232 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 232 KB
Warning::
117 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.71 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
117 requests
0.71 g CO2 per page load
Images 1.6 MiB 47%
JavaScript 1.4 MiB 40%
CSS 232.4 KiB 7%
Fonts 115.2 KiB 3%
Other 56.3 KiB 2%
HTML 35.1 KiB 1%
Other 5.6 KiB 0%
Other 2.4 KiB 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

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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4854ms total JS execution
FIX
4854ms total JS execution
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 1770ms CPU time
Warning::
Unattributable: 1145ms CPU time
Warning::
https://www.eni.com/en-IT/home.html: 484ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-53J...: 357ms CPU time
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 325ms CPU time
Warning::
Third-party scripts: 3709ms (76% of total)

Main Thread Breakdown

Script Evaluation 38% Other 33% Style & Layout 10% Script Parsing & Compilation 9% Rendering 5% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-aa73ea76ed8e580af1709d432177ccf5-lc.min.js1770ms712ms156ms3rd
Unattributable1145ms158ms0ms1st
https://www.eni.com/en-IT/home.html484ms19ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-53J7BV72&l=digitalData357ms295ms46ms3rd
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-62c52dd37469d89a3630c7c4f495257d-lc.min.js325ms34ms107ms3rd
https://cdn.cookielaw.org/scripttemplates/202606.2.0/otBannerSdk.js257ms160ms36ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0W4RJBNYEC&l=digitalData&cx=c&gtm=4e6921244ms197ms36ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MCYTXG5ZQK&l=digitalData&cx=c&gtm=4e6921205ms170ms34ms3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js66ms58ms2ms3rd
F
JS Bundles
Action
14 scripts, 826 KB unused
FIX
14 scripts, 826 KB unused
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 385 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 146 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: unminified — 87 KB could be saved
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-53J...: 78 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202606.2...: 76 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0W4R...: 72 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 826 KB
826 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-aa73ea76ed8e580af1709d432177ccf5-lc.min.js503 KB385 KB (77%)✓3rd
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-62c52dd37469d89a3630c7c4f495257d-lc.min.js188 KB146 KB (78%)✗3rd
https://www.googletagmanager.com/gtm.js?id=GTM-53J7BV72&l=digitalData188 KB78 KB (41%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202606.2.0/otBannerSdk.js137 KB76 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0W4RJBNYEC&l=digitalData&cx=c&gtm=4e6921170 KB72 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MCYTXG5ZQK&l=digitalData&cx=c&gtm=4e6921164 KB69 KB (42%)✓3rd
https://tools.euroland.com/tools/common/eurolandiframeautoheight/eurolandtoolsintegrationobject.js5 KB—✓3rd
https://www.eni.com/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.lc-0a6aff292f5cc42142779cde92054524-lc.min.js1 KB—✓3rd
https://www.eni.com/etc.clientlibs/core/wcm/components/tabs/v1/tabs/clientlibs/site.lc-c53b992b35f5ca98e25330a02d295299-lc.min.js3 KB—✓3rd
https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js1 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
117 resources · 3.4 MB · 826 KB savings available
FIX
117 resources · 3.4 MB · 826 KB savings available
Warning::
Page weight 3.4 MB exceeds 1 MB target by 2.4 MB
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~826 KB of savings available
Warning::
116 third-party resources (100% of weight)
Info::
3 resources over 200KB
117 resources · 3.4 MiB · 116 third-party 2.4 MiB over 1MB target
Image 47% · 1.6 MiB
JavaScript 40% · 1.4 MiB
CSS 7% · 237.2 KiB
Font 3% · 115.2 KiB
Other 1% · 49.3 KiB
Document 1% · 39.4 KiB

~826.2 KiB of savings available

Remove unused JavaScript: 826.2 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
80 images, 0 KB saveable
REVIEW
80 images, 0 KB saveable
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eni.com/content/dam/enicom/images/icon... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s7g10.scene7.com/is/image/eni/hero-azioni-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s7g10.scene7.com/is/image/eni/hero-prodott... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eni.com/content/dam/enicom/images/icon... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eni.com/content/dam/enicom/images/icon... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eni.com/content/dam/enicom/images/icon... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.eni.com/content/dam/enicom/images/icon... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s7g10.scene7.com/is/image/eni/accordo-eni-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s7g10.scene7.com/is/image/eni/neutralita-t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s7g10.scene7.com/is/image/eni/hero-visione... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://s7g10.scene7.com/is/image/eni/hero-attivit... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
80 images 1.6 MB
0 oversized -0 KB
52 legacy format
15 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

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

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

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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 4.9 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
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 (115 KB)
PASS
3 fonts (115 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

115 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 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 FCP 6.7 s LCP 19.3 shttps://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site/resources/fonts/eni/EniTabBold.woff2EniTabBold.woff2 https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site/resources/fonts/eni/EniTabBold.woff2 — 14.3 KiB — 11 ms — font-display: swaphttps://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site/resources/fonts/opensans/OpenSans-Regular.woff2OpenSans-Regular.woff2 https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site/resources/fonts/opensans/OpenSans-Regular.woff2 — 49.6 KiB — 18 ms — font-display: swaphttps://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site/resources/fonts/opensans/OpenSans-Bold.woff2OpenSans-Bold.woff2 https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site/resources/fonts/opensans/OpenSans-Bold.woff2 — 51.3 KiB — 20 ms — font-display: swap
EniTabBold.woff2 woff2 swap
Size 14 KB
Load time 11 ms
Start 626 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Regular.woff2 woff2 swap
Size 50 KB
Load time 18 ms
Start 626 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Bold.woff2 woff2 swap
Size 51 KB
Load time 20 ms
Start 627 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+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall
117 requests over 1733ms
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 FCP 6.7 s LCP 19.3 shttps://eni.ie// https://eni.ie/ — 301 — 182 B — 24 ms — http/1.1https://www.eni.com/en-IT/home.htmlwww.eni.com/en-IT/home.html https://www.eni.com/en-IT/home.html — 200 — 35.1 KiB — 29 ms — h2https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.jsrum.hlx.page/.rum/@adobe/helix-rum-... https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 1.1 KiB — 75 ms — h2https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-aa73ea76ed8e580af1709d432177ccf5-lc.min.jswww.eni.com/etc.clientlibs/enicom/c... https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-aa73ea76ed8e580af1709d432177ccf5-lc.min.js — 200 — 502.9 KiB — 67 ms — h2https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-881010f9a63e34ce36acda1807904fab-lc.min.csswww.eni.com/etc.clientlibs/enicom/c... 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-0W4RJBNYEC&gtm=45je6921v9181707130z89169031263za20gzb9169031263zd9169031263&_p=1788853160966&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&cid=66998603.1788853162&frm=0&ngs=1&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not%253FA_Brand%3B24.0.0.0%7CChromium%3B152.0.7977.82&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115616985~115938466~115938469~118897920~118897930~119791749~120213116~120385422~120469145~120469153&sid=1788853161&sct=1&seg=0&dl=https%3A%2F%2Fwww.eni.com%2Fen-IT%2Fhome.html&dt=Eni%2C%20an%20integrated%20energy%20company&en=page_view&_fv=1&_ss=1&tfd=982region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-0W4RJBNYEC&gtm=45je6921v9181707130z89169031263za20gzb9169031263zd9169031263&_p=1788853160966&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&cid=66998603.1788853162&frm=0&ngs=1&pscdl=noapi&rcb=12&sr=412x823&uaa=&uab=64&uafvl=Not%253FA_Brand%3B24.0.0.0%7CChromium%3B152.0.7977.82&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115616985~115938466~115938469~118897920~118897930~119791749~120213116~120385422~120469145~120469153&sid=1788853161&sct=1&seg=0&dl=https%3A%2F%2Fwww.eni.com%2Fen-IT%2Fhome.html&dt=Eni%2C%20an%20integrated%20energy%20company&en=page_view&_fv=1&_ss=1&tfd=982 — 204 — 48 B — 28 ms — h2https://6108806.global.siteimproveanalytics.io/image.aspx?url=https%3A%2F%2Fwww.eni.com%2Fen-IT%2Fhome.html&title=Eni%2C%20an%20integrated%20energy%20company&res=412x823&accountid=6108806&rt=893&prev=dcc4c7d0-6c19-f0e0-61ab-f27f3d762334&luid=da92518d-ec06-808b-cfc7-c40e70d53973&rnd=498496108806.global.siteimproveanalytics... https://6108806.global.siteimproveanalytics.io/image.aspx?url=https%3A%2F%2Fwww.eni.com%2Fen-IT%2Fhome.html&title=Eni%2C%20an%20integrated%20energy%20company&res=412x823&accountid=6108806&rt=893&prev=dcc4c7d0-6c19-f0e0-61ab-f27f3d762334&luid=da92518d-ec06-808b-cfc7-c40e70d53973&rnd=49849 — 200 — 210 B — 172 ms — h2https://cdn.cookielaw.org/consent/021530b9-27ce-4325-9f4d-1a1edcde9d5c/8217af72-6181-46e7-a5a4-b8c421024b2c/en.jsoncdn.cookielaw.org/consent/021530b9-... https://cdn.cookielaw.org/consent/021530b9-27ce-4325-9f4d-1a1edcde9d5c/8217af72-6181-46e7-a5a4-b8c421024b2c/en.json — 200 — 26.7 KiB — 35 ms — 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https://cdn.cookielaw.org/logos/static/ot_guard_logo.svg — 200 — 512 B — 27 ms — h2https://cdn.cookielaw.org/logos/5014c41b-2ad7-4610-8bb1-441fce8b95e1/019a2b6b-aa98-7bde-9384-8202492279a2/af871016-d36d-49b5-be86-77856689fb71/Logo_Eni.pngcdn.cookielaw.org/logos/5014c41b-2a... https://cdn.cookielaw.org/logos/5014c41b-2ad7-4610-8bb1-441fce8b95e1/019a2b6b-aa98-7bde-9384-8202492279a2/af871016-d36d-49b5-be86-77856689fb71/Logo_Eni.png — 200 — 2.5 KiB — 37 ms — h2https://cdn.cookielaw.org/logos/static/powered_by_logo.svgcdn.cookielaw.org/logos/static/powe... https://cdn.cookielaw.org/logos/static/powered_by_logo.svg — 200 — 2.7 KiB — 34 ms — h2https://www.eni.com/libs/granite/csrf/token.jsonwww.eni.com/libs/granite/csrf/token... https://www.eni.com/libs/granite/csrf/token.json — 200 — 733 B — 45 ms — h2https://www.eni.com/content/dam/enicom/images/favicons/favicon.svgwww.eni.com/content/dam/enicom/imag... https://www.eni.com/content/dam/enicom/images/favicons/favicon.svg — 200 — 4.1 KiB — 13 ms — h2https://www.eni.com/content/dam/enicom/images/favicons/favicon.icowww.eni.com/content/dam/enicom/imag... https://www.eni.com/content/dam/enicom/images/favicons/favicon.ico — 200 — 1.3 KiB — 10 ms — h2https://www.eni.com/content/dam/enicom/jsons/eni_ai_testi_en.jsonwww.eni.com/content/dam/enicom/json... https://www.eni.com/content/dam/enicom/jsons/eni_ai_testi_en.json — 200 — 1.3 KiB — 61 ms — h2https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site/resources/assets/ChevronRightBlue.svgwww.eni.com/etc.clientlibs/enicom/c... https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site/resources/assets/ChevronRightBlue.svg — 200 — 924 B — 58 ms — h2https://www.eni.com/en-IT/actions/global-activities.region-menu.htmlwww.eni.com/en-IT/actions/global-ac... https://www.eni.com/en-IT/actions/global-activities.region-menu.html — 200 — 2.2 KiB — 43 ms — h2https://www.eni.com/en-IT/actions/global-activities.region-menu-mbl.htmlwww.eni.com/en-IT/actions/global-ac... https://www.eni.com/en-IT/actions/global-activities.region-menu-mbl.html — 200 — 2.2 KiB — 45 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
76% of JavaScript execution is third-party
First-party Third-party 3709ms · 1394KB · €40/mo
www.eni.com
Other
Costly
Execution 1770ms
Transfer 503 KB
Unused 77%
Monthly Cost €19/mo
www.eni.com
Other
Costly
Execution 484ms
Transfer 35 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 357ms
Transfer 188 KB
Unused 41%
Monthly Cost €4/mo
www.eni.com
Other
Costly
Execution 325ms
Transfer 188 KB
Unused 78%
Monthly Cost €4/mo
OneTrust
Consent
Essential
Execution 257ms
Transfer 137 KB
Unused 55%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 244ms
Transfer 170 KB
Unused 42%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 205ms
Transfer 164 KB
Unused 42%
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 66ms
Transfer 9 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.eni.com adds 1770ms and costs ~€19/month
  • www.eni.com adds 484ms and costs ~€5/month
  • Google Tag Manager adds 357ms and costs ~€4/month
  • www.eni.com adds 325ms and costs ~€4/month
  • Google Tag Manager adds 244ms and costs ~€3/month
  • Google Tag Manager adds 205ms and costs ~€2/month

76% 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.eni.com takes 1770ms 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

77% of www.eni.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

www.eni.com takes 484ms 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 357ms 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.eni.com takes 325ms 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

78% of www.eni.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

55% of OneTrust'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

Google Tag Manager takes 244ms 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 205ms 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

How third-party costs are calculated

Image Optimization
78 images, 34 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

78

Total Size

34 KB

Oversized

10

4 missing alt text 78 missing dimensions 72 missing lazy loading
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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