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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
7
PASS
11
INFO
3

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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
77
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.

6.70 s

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

17.53 s

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

1.71 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.

11.13 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.

17.77 s

Page Load Progression

610 ms
1.2 s
1.8 s
2.4 s
3.1 s
3.7 s
4.3 s
4.9 s
Checks
26
11 PASS 7 REVIEW 5 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 116 requests
FIX
3.1 MB transferred, 116 requests
Warning::
Page weighs 10.0 MB (3.1 MB transferred)
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 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 233 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 233 KB
Warning::
116 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.66 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
116 requests
0.66 g CO2 per page load
Images 1.4 MiB 43%
JavaScript 1.4 MiB 43%
CSS 232.6 KiB 7%
Fonts 115.2 KiB 4%
Other 56.3 KiB 2%
HTML 34.5 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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
8155ms total JS execution
FIX
8155ms total JS execution
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 2831ms CPU time
Warning::
Unattributable: 1778ms CPU time
Warning::
https://www.eni.com/en-IT/home.html: 969ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-53J...: 677ms CPU time
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 491ms CPU time
Warning::
Third-party scripts: 6377ms (78% of total)

Main Thread Breakdown

Script Evaluation 38% Other 31% Script Parsing & Compilation 10% Style & Layout 9% Rendering 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-aa73ea76ed8e580af1709d432177ccf5-lc.min.js2831ms1218ms290ms3rd
Unattributable1778ms254ms0ms1st
https://www.eni.com/en-IT/home.html969ms36ms4ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-53J7BV72&l=digitalData677ms533ms96ms3rd
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-18a616ff409165b497ab8690a5caea76-lc.min.js491ms57ms194ms3rd
https://cdn.cookielaw.org/scripttemplates/202606.2.0/otBannerSdk.js456ms282ms74ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0W4RJBNYEC&l=digitalData&cx=c&gtm=4e68j0390ms318ms66ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MCYTXG5ZQK&l=digitalData&cx=c&gtm=4e68j0349ms280ms64ms3rd
https://siteimproveanalytics.com/js/siteanalyze_6108806.js125ms61ms7ms3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js89ms79ms4ms3rd
F
JS Bundles
Action
14 scripts, 793 KB unused
FIX
14 scripts, 793 KB unused
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 386 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 119 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: unminified — 71 KB could be saved
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-53J...: 76 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...: 70 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 793 KB
793 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 KB386 KB (77%)✓3rd
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-18a616ff409165b497ab8690a5caea76-lc.min.js185 KB119 KB (78%)✗3rd
https://www.googletagmanager.com/gtm.js?id=GTM-53J7BV72&l=digitalData187 KB76 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=4e68j0166 KB70 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MCYTXG5ZQK&l=digitalData&cx=c&gtm=4e68j0161 KB67 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
116 resources · 3.1 MB · 793 KB savings available
FIX
116 resources · 3.1 MB · 793 KB savings available
Warning::
Page weight 3.1 MB exceeds 1 MB target by 2.1 MB
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~793 KB of savings available
Warning::
115 third-party resources (100% of weight)
Info::
2 resources over 200KB
116 resources · 3.1 MiB · 115 third-party 2.1 MiB over 1MB target
Image 43% · 1.4 MiB
JavaScript 43% · 1.4 MiB
CSS 7% · 237.3 KiB
Font 4% · 115.2 KiB
Other 2% · 49.3 KiB
Document 1% · 38.8 KiB

~793.3 KiB of savings available

Remove unused JavaScript: 793.3 KiB
C
Image Optimization
Action
79 images, 0 KB saveable
REVIEW
79 images, 0 KB saveable
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-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://s7g10.scene7.com/is/image/eni/hpc7-0:squar... 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://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://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-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://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/hero-attivit... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
79 images 1.4 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
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 8.2 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

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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 FCP 6.7 s LCP 17.5 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 — 19 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 — 24 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 — 24 ms — font-display: swap
EniTabBold.woff2 woff2 swap
Size 14 KB
Load time 19 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
OpenSans-Regular.woff2 woff2 swap
Size 50 KB
Load time 24 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
OpenSans-Bold.woff2 woff2 swap
Size 51 KB
Load time 24 ms
Start 1.3 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+
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+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: max-age=0
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
116 requests over 2820ms
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 FCP 6.7 s LCP 17.5 shttps://eni.com// https://eni.com/ — 301 — 138 B — 42 ms — h2https://www.eni.com/en-IT/home.htmlwww.eni.com/en-IT/home.html https://www.eni.com/en-IT/home.html — 200 — 34.5 KiB — 56 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 — 1.0 KiB — 36 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 — 56 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://www.google-analytics.com/g/collect?v=2&tid=G-MCYTXG5ZQK&gtm=45je68j0v880685853z89169031263za20gzb9169031263zd9169031263&_p=1787580707260&gcd=13l3l3l3l3l1&npa=1&dma=0&are=1&cid=1514492815.1787580709&frm=0&ngs=1&pscdl=noapi&rcb=7&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115616985~115938465~115938469~118897920~118897930~119367802~119367810~120315470~120385423&dt=Home&sid=1787580708&sct=1&seg=0&dl=https%3A%2F%2Fwww.eni.com%2Fen-IT%2Fhome.html&_tu=AAg&en=page_view&_fv=1&_ss=1&ep.site_id=enicom&ep.site_env=prod&ep.internal_visit=false&ep.custom_session_id=ORs5D-4c3a4XVt1_iT505&ep.page_id=%2Fcontent%2Fenicom%2Fit%2Fen%2Fhome&ep.page_url=https%3A%2F%2Fwww.eni.com%2Fen-IT%2Fhome.html&ep.page_language=en&ep.page_category=Home&ep.page_tag_implicit=Azienda%2CTransizione%20energetica%2CInnovazione%20tecnologica%2CEnergia%20unica%2CPersone&ep.page_publish_date=17-08-2026%20-%2009%3A16&ep.page_creation_date=20-11-2023%20-%2009%3A35&ep.full_referrer=no%20referrer&up.cookies_preferences=f%3Afalse%7Cp%3Afalse%7Ct%3Afalse%7Cs%3Afalse&tfd=1624www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-MCYTXG5ZQK&gtm=45je68j0v880685853z89169031263za20gzb9169031263zd9169031263&_p=1787580707260&gcd=13l3l3l3l3l1&npa=1&dma=0&are=1&cid=1514492815.1787580709&frm=0&ngs=1&pscdl=noapi&rcb=7&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115616985~115938465~115938469~118897920~118897930~119367802~119367810~120315470~120385423&dt=Home&sid=1787580708&sct=1&seg=0&dl=https%3A%2F%2Fwww.eni.com%2Fen-IT%2Fhome.html&_tu=AAg&en=page_view&_fv=1&_ss=1&ep.site_id=enicom&ep.site_env=prod&ep.internal_visit=false&ep.custom_session_id=ORs5D-4c3a4XVt1_iT505&ep.page_id=%2Fcontent%2Fenicom%2Fit%2Fen%2Fhome&ep.page_url=https%3A%2F%2Fwww.eni.com%2Fen-IT%2Fhome.html&ep.page_language=en&ep.page_category=Home&ep.page_tag_implicit=Azienda%2CTransizione%20energetica%2CInnovazione%20tecnologica%2CEnergia%20unica%2CPersone&ep.page_publish_date=17-08-2026%20-%2009%3A16&ep.page_creation_date=20-11-2023%20-%2009%3A35&ep.full_referrer=no%20referrer&up.cookies_preferences=f%3Afalse%7Cp%3Afalse%7Ct%3Afalse%7Cs%3Afalse&tfd=1624 — 204 — 48 B — 67 ms — h2https://cdn.cookielaw.org/consent/021530b9-27ce-4325-9f4d-1a1edcde9d5c/021530b9-27ce-4325-9f4d-1a1edcde9d5c.jsoncdn.cookielaw.org/consent/021530b9-... https://cdn.cookielaw.org/consent/021530b9-27ce-4325-9f4d-1a1edcde9d5c/021530b9-27ce-4325-9f4d-1a1edcde9d5c.json — 200 — 2.4 KiB — 23 ms — h2https://cdn.cookielaw.org/scripttemplates/202606.2.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202606.2.0/otBannerSdk.js — 200 — 136.6 KiB — 19 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 — 22 ms — h2https://cdn.cookielaw.org/scripttemplates/202606.2.0/assets/otFlat.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202606.2.0/assets/otFlat.json — 200 — 3.4 KiB — 12 ms — h2https://cdn.cookielaw.org/scripttemplates/202606.2.0/assets/v2/otPcTab.jsoncdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202606.2.0/assets/v2/otPcTab.json — 200 — 14.0 KiB — 15 ms — h2https://cdn.cookielaw.org/scripttemplates/202606.2.0/assets/otCommonStyles.csscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202606.2.0/assets/otCommonStyles.css — 200 — 4.7 KiB — 11 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 — 213 ms — h2https://www.eni.com/content/dam/enicom/images/icone/Icon_close_blue_24.svgwww.eni.com/content/dam/enicom/imag... https://www.eni.com/content/dam/enicom/images/icone/Icon_close_blue_24.svg — 200 — 635 B — 15 ms — h2https://cdn.cookielaw.org/logos/static/ot_guard_logo.svgcdn.cookielaw.org/logos/static/ot_g... https://cdn.cookielaw.org/logos/static/ot_guard_logo.svg — 200 — 512 B — 11 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 — 15 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 — 11 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 — 4.2 KiB — 14 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 — 12 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 — 240 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 — 927 B — 249 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 — 222 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 — 220 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
78% of JavaScript execution is third-party
First-party Third-party 6377ms · 1395KB · €69/mo
www.eni.com
Other
Costly
Execution 2831ms
Transfer 503 KB
Unused 77%
Monthly Cost €31/mo
www.eni.com
Other
Costly
Execution 969ms
Transfer 34 KB
Monthly Cost €11/mo
Google Tag Manager
Tag Manager
Costly
Execution 677ms
Transfer 187 KB
Unused 41%
Monthly Cost €7/mo
www.eni.com
Other
Costly
Execution 491ms
Transfer 185 KB
Unused 78%
Monthly Cost €5/mo
OneTrust
Consent
Essential
Execution 456ms
Transfer 137 KB
Unused 55%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 390ms
Transfer 166 KB
Unused 42%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 349ms
Transfer 161 KB
Unused 42%
Monthly Cost €4/mo
siteimproveanalytics.com
Other
Optional
Execution 125ms
Transfer 13 KB
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 89ms
Transfer 9 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.eni.com adds 2831ms and costs ~€31/month
  • www.eni.com adds 969ms and costs ~€11/month
  • Google Tag Manager adds 677ms and costs ~€7/month
  • www.eni.com adds 491ms and costs ~€5/month
  • Google Tag Manager adds 390ms and costs ~€4/month
  • Google Tag Manager adds 349ms and costs ~€4/month

78% 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 2831ms 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 969ms 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 677ms 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 491ms 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 390ms 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 349ms 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
77 images, 34 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

77

Total Size

34 KB

Oversized

9

4 missing alt text 77 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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