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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
7
PASS
8
INFO
3

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
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.

1.42 s

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

3.90 s

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

208 ms

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

0.044

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

2.99 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.

3.93 s

Page Load Progression

561 ms
1.1 s
1.7 s
2.2 s
2.8 s
3.4 s
3.9 s
4.5 s
Checks
22
8 PASS 7 REVIEW 4 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 117 requests
FIX
3.4 MB transferred, 117 requests
Warning::
Page weighs 10.2 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 233 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 233 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 232.6 KiB 7%
Fonts 115.2 KiB 3%
Other 56.2 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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
14 scripts, 820 KB unused
FIX
14 scripts, 820 KB unused
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 387 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 145 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: unminified — 85 KB could be saved
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/gtm.js?id=GTM-53J...: 76 KB unused (41%)
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: 820 KB
820 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 KB387 KB (77%)✓3rd
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-18a616ff409165b497ab8690a5caea76-lc.min.js185 KB145 KB (79%)✗3rd
https://cdn.cookielaw.org/scripttemplates/202606.2.0/otBannerSdk.js137 KB76 KB (55%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-53J7BV72&l=digitalData187 KB76 KB (41%)✓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://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
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 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 · 820 KB savings available
FIX
117 resources · 3.4 MB · 820 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::
~820 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% · 237.3 KiB
Font 3% · 115.2 KiB
Other 1% · 49.3 KiB
Document 1% · 38.8 KiB

~819.5 KiB of savings available

Remove unused JavaScript: 819.5 KiB
C
Image Optimization
Action
80 images, 0 KB saveable
REVIEW
80 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://s7g10.scene7.com/is/image/eni/hpc7-0:horiz... 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/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-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-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.
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/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/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://www.eni.com/etc.clientlibs/enicom/clientli... 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
53 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
1979ms total JS execution
REVIEW
1979ms total JS execution
Warning::
https://www.eni.com/etc.clientlibs/enicom/clientli...: 636ms CPU time
Warning::
Unattributable: 396ms CPU time
Warning::
https://www.eni.com/en-IT/home.html: 377ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-53J...: 178ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0W4R...: 127ms CPU time
Warning::
Third-party scripts: 1583ms (80% of total)

Main Thread Breakdown

Script Evaluation 37% Other 31% Style & Layout 12% Script Parsing & Compilation 10% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-dependencies.lc-aa73ea76ed8e580af1709d432177ccf5-lc.min.js636ms262ms72ms3rd
Unattributable396ms50ms0ms1st
https://www.eni.com/en-IT/home.html377ms6ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-53J7BV72&l=digitalData178ms138ms23ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0W4RJBNYEC&l=digitalData&cx=c&gtm=4e68j0127ms98ms16ms3rd
https://cdn.cookielaw.org/scripttemplates/202606.2.0/otBannerSdk.js116ms70ms20ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MCYTXG5ZQK&l=digitalData&cx=c&gtm=4e68j092ms75ms16ms3rd
https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-18a616ff409165b497ab8690a5caea76-lc.min.js58ms13ms45ms3rd
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.
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 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 3.9 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 — 24 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 — 27 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 — 27 ms — font-display: swap
EniTabBold.woff2 woff2 swap
Size 14 KB
Load time 24 ms
Start 611 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Regular.woff2 woff2 swap
Size 50 KB
Load time 27 ms
Start 613 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Bold.woff2 woff2 swap
Size 51 KB
Load time 27 ms
Start 614 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+
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.
Network Waterfall
117 requests over 2163ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 3.9 shttps://eni.com// https://eni.com/ — 301 — 138 B — 40 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 — 33 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 — 20 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 — 74 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 — 19 ms — h2https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-1915440a56481c042ae02dd158495a73-lc.min.csswww.eni.com/etc.clientlibs/enicom/c... https://www.eni.com/etc.clientlibs/enicom/clientlibs/clientlib-site.lc-1915440a56481c042ae02dd158495a73-lc.min.css — 200 — 173.3 KiB — 35 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 — 848 B — 31 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 — 46 ms — 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— 204 — 546 B — 369 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 — 39 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 — 17 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 — 17 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 — 10 ms — 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https://www.google-analytics.com/g/collect?v=2&tid=G-0W4RJBNYEC&gtm=45je68j0v9181707130z89169031263za20gzb9169031263zd9169031263&_p=1787580733301&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1758721285.1787580735&frm=0&ngs=1&pscdl=noapi&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938469~118897920~118897930~119367802~119367810~120315471~120385423&sid=1787580734&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=1673 — 204 — 48 B — 126 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 — 20 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 — 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 — 21 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 — 20 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 — 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 — 40 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 — 41 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
80% of JavaScript execution is third-party
First-party Third-party 1583ms · 1373KB · €17/mo
www.eni.com
Other
Costly
Execution 636ms
Transfer 503 KB
Unused 77%
Monthly Cost €7/mo
www.eni.com
Other
Costly
Execution 377ms
Transfer 34 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 178ms
Transfer 187 KB
Unused 41%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 127ms
Transfer 166 KB
Unused 42%
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 116ms
Transfer 137 KB
Unused 55%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 92ms
Transfer 161 KB
Unused 42%
Monthly Cost €1/mo
www.eni.com
Other
Optional
Execution 58ms
Transfer 185 KB
Unused 79%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.eni.com adds 636ms and costs ~€7/month
  • www.eni.com adds 377ms and costs ~€4/month

80% 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 636ms 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 377ms 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

79% 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

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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