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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
7
PASS
7
INFO
3

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

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.

1.36 s

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

3.98 s

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

24 ms

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

0.037

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

3.00 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.

4.05 s

Page Load Progression

513 ms
1.0 s
1.5 s
2.1 s
2.6 s
3.1 s
3.6 s
4.1 s
Checks
22
7 PASS 7 REVIEW 5 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 119 requests
FIX
3.6 MB transferred, 119 requests
Warning::
Page weighs 10.4 MB (3.6 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 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::
119 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.74 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
119 requests
0.74 g CO2 per page load
Images 1.8 MiB 49%
JavaScript 1.4 MiB 38%
CSS 232.7 KiB 6%
Fonts 115.2 KiB 3%
Other 56.2 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 (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
14 scripts, 825 KB unused
FIX
14 scripts, 825 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...: 147 KB unused (79%)
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: 825 KB
825 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-62c52dd37469d89a3630c7c4f495257d-lc.min.js188 KB147 KB (79%)✗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=4e6930h2171 KB72 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MCYTXG5ZQK&l=digitalData&cx=c&gtm=4e6930h2164 KB67 KB (41%)✓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
119 resources · 3.6 MB · 825 KB savings available
FIX
119 resources · 3.6 MB · 825 KB savings available
Warning::
Page weight 3.6 MB exceeds 1 MB target by 2.6 MB
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~825 KB of savings available
Warning::
118 third-party resources (100% of weight)
Info::
4 resources over 200KB
119 resources · 3.6 MiB · 118 third-party 2.6 MiB over 1MB target
Image 50% · 1.8 MiB
JavaScript 38% · 1.4 MiB
CSS 7% · 237.5 KiB
Font 3% · 115.2 KiB
Other 1% · 49.3 KiB
Document 1% · 39.5 KiB

~825.3 KiB of savings available

Remove unused JavaScript: 825.3 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
82 images, 0 KB saveable
REVIEW
82 images, 0 KB saveable
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.
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://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/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/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://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://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/content/dam/enicom/images/logh... 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.
82 images 1.8 MB
0 oversized -0 KB
54 legacy format
16 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

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1201ms total JS execution
REVIEW
1201ms total JS execution
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 376ms CPU time
Warning::
Unattributable: 288ms CPU time
Info::
https://www.eni.com/en-IT/home.html: 244ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-53J...: 106ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202606.2...: 65ms CPU time
Warning::
Third-party scripts: 913ms (76% of total)

Main Thread Breakdown

Script Evaluation 37% Other 31% Style & Layout 12% Script Parsing & Compilation 9% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-aa73ea76ed8e580af1709d432177ccf5-lc.min.js376ms163ms36ms3rd
Unattributable288ms42ms0ms1st
https://www.eni.com/en-IT/home.html244ms5ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-53J7BV72&l=digitalData106ms90ms12ms3rd
https://cdn.cookielaw.org/scripttemplates/202606.2.0/otBannerSdk.js65ms41ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MCYTXG5ZQK&l=digitalData&cx=c&gtm=4e6930h262ms52ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0W4RJBNYEC&l=digitalData&cx=c&gtm=4e6930h260ms50ms10ms3rd
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.
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 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 4.0 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 — 20 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 564 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Regular.woff2 woff2 swap
Size 50 KB
Load time 20 ms
Start 566 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Bold.woff2 woff2 swap
Size 51 KB
Load time 20 ms
Start 567 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.
Network Waterfall
119 requests over 1884ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 4.0 shttps://eni.ie// https://eni.ie/ — 301 — 182 B — 46 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 — 83 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 — 13 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 — 54 ms — h2https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-881010f9a63e34ce36acda1807904fab-lc.min.csswww.eni.com/etc.clientlibs/enicom/c... https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-881010f9a63e34ce36acda1807904fab-lc.min.css — 200 — 44.7 KiB — 17 ms — h2https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-41c1e8962bb12b8c417f2f9c72447973-lc.min.csswww.eni.com/etc.clientlibs/enicom/c... https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-41c1e8962bb12b8c417f2f9c72447973-lc.min.css — 200 — 173.1 KiB — 39 ms — h2https://www.eni.com/etc.clientlibs/core/wcm/components/tabs/v1/tabs/clientlibs/site.lc-d54c23ba76bd8648119795790ae83779-lc.min.csswww.eni.com/etc.clientlibs/core/wcm... https://www.eni.com/etc.clientlibs/core/wcm/components/tabs/v1/tabs/clientlibs/site.lc-d54c23ba76bd8648119795790ae83779-lc.min.css — 200 — 844 B — 36 ms — h2https://www.eni.com/content/dam/enicom/images/loghi/logoEni.svgwww.eni.com/content/dam/enicom/imag... https://www.eni.com/content/dam/enicom/images/loghi/logoEni.svg — 200 — 6.6 KiB — 41 ms — 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-0W4RJBNYEC&gtm=45je6930h2v9181707130z89169031263za20gzb9169031263zd9169031263&_p=1788853181436&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&cid=1348652498.1788853182&frm=0&ngs=1&pscdl=noapi&rcb=7&sr=800x600&uaa=x86&uab=64&uafvl=Not%253FA_Brand%3B24.0.0.0%7CChromium%3B152.0.7977.82&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938469~118897920~118897930~120213116~120385422~120469145~120469153&sid=1788853182&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=1009region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-0W4RJBNYEC&gtm=45je6930h2v9181707130z89169031263za20gzb9169031263zd9169031263&_p=1788853181436&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&cid=1348652498.1788853182&frm=0&ngs=1&pscdl=noapi&rcb=7&sr=800x600&uaa=x86&uab=64&uafvl=Not%253FA_Brand%3B24.0.0.0%7CChromium%3B152.0.7977.82&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938469~118897920~118897930~120213116~120385422~120469145~120469153&sid=1788853182&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=1009 — 204 — 48 B — 38 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 — 80 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 — 12 ms — h2https://www.googletagmanager.com/a?v=3&t=l&pid=972496802&rv=6930&tag_exp=115616985~115938465~115938468~118897920~118897930~120213116~120385423~120469145~120469153&u=AAAAAAAIAAAAACAg&ut=Ag&h=Ag&gtm=45je6930h2v880685853za20gzb9169031263zd9169031263&ccid=80685853&cid=G-MCYTXG5ZQK&l=L153.S42.B34.E159.I666.TC15.HTC0.F552.C4~gtm.init_consent.S2.V2.E35~gtm.init.S0.V0.E41.TS5ogtautoevents.TI109.TE0.TS5ogtreferralexclusion.TI107.TE0.TS5ogt1pdatav2.TI110.TE0.TS5ccdgafirst.TI121.TE0.TS5setproductsettings.TI120.TE0.TS5ccdgaregscope.TI119.TE0.TS5ccdemdownload.TI118.TE1.TS5ccdemoutboundclick.TI117.TE0.TS5ccdempageview.TI116.TE0.TS5ccdemvideo.TI115.TE0.TS5ccdconversionmarking.TI114.TE0.TS5ogteventedit.TI113.TE0.TS5ccdautoredact.TI112.TE0.TS5ccdgalast.TI111.TE0~gtm.js.S0.V0.E32.TS5gct.TI105.TE0~*.S0.V0.E4~gtm.dom.S0.V0.E4~gtm.load.S0.V0.E13~gtm.scrollDepth.S0.V0~GA779.905www.googletagmanager.com/a?v=3&t=l&... https://www.googletagmanager.com/a?v=3&t=l&pid=972496802&rv=6930&tag_exp=115616985~115938465~115938468~118897920~118897930~120213116~120385423~120469145~120469153&u=AAAAAAAIAAAAACAg&ut=Ag&h=Ag&gtm=45je6930h2v880685853za20gzb9169031263zd9169031263&ccid=80685853&cid=G-MCYTXG5ZQK&l=L153.S42.B34.E159.I666.TC15.HTC0.F552.C4~gtm.init_consent.S2.V2.E35~gtm.init.S0.V0.E41.TS5ogtautoevents.TI109.TE0.TS5ogtreferralexclusion.TI107.TE0.TS5ogt1pdatav2.TI110.TE0.TS5ccdgafirst.TI121.TE0.TS5setproductsettings.TI120.TE0.TS5ccdgaregscope.TI119.TE0.TS5ccdemdownload.TI118.TE1.TS5ccdemoutboundclick.TI117.TE0.TS5ccdempageview.TI116.TE0.TS5ccdemvideo.TI115.TE0.TS5ccdconversionmarking.TI114.TE0.TS5ogteventedit.TI113.TE0.TS5ccdautoredact.TI112.TE0.TS5ccdgalast.TI111.TE0~gtm.js.S0.V0.E32.TS5gct.TI105.TE0~*.S0.V0.E4~gtm.dom.S0.V0.E4~gtm.load.S0.V0.E13~gtm.scrollDepth.S0.V0~GA779.905 — 200 — 11 B — 38 ms — h3https://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 — 19 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://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 — 226 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 — 51 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 — 37 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 — 41 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 — 38 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 — 632 B — 14 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 — 489 B — 30 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 — 345 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 — 149 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 — 11 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 — 925 B — 15 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 — 12 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 — 22 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 913ms · 1197KB · €10/mo
www.eni.com
Other
Costly
Execution 376ms
Transfer 503 KB
Unused 77%
Monthly Cost €4/mo
www.eni.com
Other
Costly
Execution 244ms
Transfer 35 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 106ms
Transfer 188 KB
Unused 41%
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 65ms
Transfer 137 KB
Unused 55%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 62ms
Transfer 164 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 171 KB
Unused 42%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.eni.com adds 376ms and costs ~€4/month
  • www.eni.com adds 244ms and costs ~€3/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 376ms 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 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

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

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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