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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
74
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

855 ms

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

2.60 s

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

247 ms

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

0.046

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

1.63 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.

2.61 s

Page Load Progression

674 ms
1.3 s
2.0 s
2.7 s
3.4 s
4.0 s
4.7 s
5.4 s
Checks
22
8 PASS 7 REVIEW 4 FIX
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 (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5769ms total JS execution
FIX
5769ms total JS execution
Warning::
https://www.enel.com/etc.clientlibs/enel-common/cl...: 3633ms CPU time
Warning::
https://www.enel.com/: 1495ms CPU time
Warning::
Unattributable: 418ms CPU time
Info::
https://assets.adobedtm.com/launch-ENb531171bce964...: 161ms CPU time
Info::
https://consent.trustarc.com/asset/notice.js/v/v1....: 61ms CPU time
Warning::
Third-party scripts: 5351ms (93% of total)

Main Thread Breakdown

Other 42% Script Evaluation 20% Style & Layout 18% Rendering 17%
ScriptTotalScriptingParse/CompileParty
https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle.lc-81b320f9fffb178b64202b1365875526-lc.min.js3633ms979ms96ms3rd
https://www.enel.com/1495ms2ms1ms3rd
Unattributable418ms1ms0ms1st
https://assets.adobedtm.com/launch-ENb531171bce964c769bfc582af650ee4a.js161ms134ms16ms3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-908961ms43ms2ms3rd
F
JS Bundles
Action
16 scripts, 685 KB unused
FIX
16 scripts, 685 KB unused
Warning::
https://www.enel.com/etc.clientlibs/enel-common/cl...: 663 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.trustarc.com/asset/notice.js/v/v1....: 22 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 685 KB
685 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle.lc-81b320f9fffb178b64202b1365875526-lc.min.js847 KB663 KB (79%)✓3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-908931 KB22 KB (71%)✓3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.js13 KB—✓3rd
https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC25aeefff7bdd4f86a4369efb186ab44e-source.js1 KB—✓3rd
https://www.enel.com/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js1 KB—✓3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.js2 KB—✓3rd
https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RCe768bf6d8eff4ea495cab6f62f470268-source.js1 KB—✓3rd
https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RCdcc61a84fcd84b068d2c39576dedf22d-source.js1 KB—✓3rd
https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC1608e7ad1cd541d690e9adec75ebc923-source.js1 KB—✓3rd
https://www.enel.com/etc.clientlibs/clientlibs/granite/jquery/granite/csrf.lc-652a558c3774088b61b0530c184710d1-lc.min.js4 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

F
Page Weight Inventory
Action
69 resources · 2.0 MB · 685 KB savings available
FIX
69 resources · 2.0 MB · 685 KB savings available
Warning::
Page weight 2.0 MB exceeds 1 MB target by 1.0 MB
Got: 2.0 MB Expected: ≤ 1 MB
Info::
~685 KB of savings available
Warning::
68 third-party resources (100% of weight)
Info::
1 resources over 200KB
69 resources · 2.0 MiB · 68 third-party 1.0 MiB over 1MB target
JavaScript 49% · 1010.3 KiB
Image 34% · 697.8 KiB
Font 8% · 155.0 KiB
CSS 7% · 137.0 KiB
Document 3% · 54.8 KiB
Other 0% · 2.5 KiB

~684.6 KiB of savings available

Remove unused JavaScript: 684.6 KiB
C
Page Weight Budget
Action
2.0 MB transferred, 69 requests
REVIEW
2.0 MB transferred, 69 requests
Info::
Page weighs 6.5 MB (2.0 MB transferred)
Warning::
JavaScript is 1010 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1010 KB
Info::
69 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
69 requests
0.42 g CO2 per page load
JavaScript 1010.1 KiB 49%
Images 695.1 KiB 34%
Fonts 155.0 KiB 8%
CSS 137.0 KiB 7%
HTML 54.6 KiB 3%
Other 3.0 KiB 0%
Other 1.7 KiB 0%
Other 930 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.enel.com/content/dam/enel-com/immagini... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.enel.com/content/dam/enel-com/immagini... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.enel.com/content/dam/enel-com/immagini... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.enel.com/content/dam/enel-com/immagini... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.enel.com/etc.clientlibs/enel-common/cl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.enel.com/content/dam/enel-com/immagini... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 695 KB
0 oversized -0 KB
32 legacy format
6 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

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
Main HTML max-age=900 (~15min)
REVIEW
Main HTML max-age=900 (~15min)
Info::
Main HTML cached for 15 minutes -- mild staleness risk
Got: max-age=900,stale-while-revalidate=3600
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
5 fonts (155 KB)
PASS
5 fonts (155 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

155 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 855 ms LCP 2.6 shttps://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/fonts/roobert_v6_regular.woff2?4e6d1065f4a81659e64db7343e280785roobert_v6_regular.woff2 https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/fonts/roobert_v6_regular.woff2?4e6d1065f4a81659e64db7343e280785 — 21.4 KiB — 76 ms — font-display: swaphttps://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/fonts/roobert_v6_bold.woff2?59bfc23757446c329f732e4e45db0407roobert_v6_bold.woff2 https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/fonts/roobert_v6_bold.woff2?59bfc23757446c329f732e4e45db0407 — 21.3 KiB — 87 ms — font-display: swaphttps://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/fonts/roobert_v6_light.woff2?e414daf48e8914451d8ef4f719ad8b5eroobert_v6_light.woff2 https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/fonts/roobert_v6_light.woff2?e414daf48e8914451d8ef4f719ad8b5e — 20.7 KiB — 82 ms — font-display: swaphttps://consent.trustarc.com/get?name=roobertenel-regular.woff2get https://consent.trustarc.com/get?name=roobertenel-regular.woff2 — 45.6 KiB — 8 ms — font-display: swaphttps://consent.trustarc.com/get?name=roobertenel-bold.woff2get https://consent.trustarc.com/get?name=roobertenel-bold.woff2 — 46.0 KiB — 8 ms — font-display: swap
roobert_v6_regular.woff2 woff2 swap
Size 21 KB
Load time 76 ms
Start 827 ms
Risk FOUT — text flashes from fallback to web font
roobert_v6_bold.woff2 woff2 swap
Size 21 KB
Load time 87 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
roobert_v6_light.woff2 woff2 swap
Size 21 KB
Load time 82 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
get woff2 swap
Size 46 KB
Load time 8 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
get woff2 swap
Size 46 KB
Load time 8 ms
Start 1.2 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+
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
HTTP Caching
max-age=900 (15 minutes)
PASS
max-age=900 (15 minutes)
Info::
Cache-Control header is set
Got: max-age=900,stale-while-revalidate=3600
Info::
Effective TTL: 15 minutes (max-age=900)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=900,stale-while-revalidate=3600

DirectiveValueMeaning
max-age900Cache for 15 minutes
stale-while-revalidate3600Serve stale for 1 hour while fetching fresh
Effective TTL: 900 seconds
Network Waterfall
69 requests over 3317ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 855 ms LCP 2.6 shttps://enel.com// https://enel.com/ — 301 — 215 B — 11 ms — h2https://www.enel.com/www.enel.com/ https://www.enel.com/ — 200 — 51.4 KiB — 13 ms — h2https://www.enel.com/.rum/@adobe/helix-rum-js@%5E2/dist/micro.jswww.enel.com/.rum/@adobe/helix-rum-... https://www.enel.com/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 968 B — 24 ms — h2https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle.lc-84662e0e38777d08aa6397720c4c82cd-lc.min.csswww.enel.com/etc.clientlibs/enel-co... https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle.lc-84662e0e38777d08aa6397720c4c82cd-lc.min.css — 200 — 137.0 KiB — 33 ms — h2https://assets.adobedtm.com/launch-ENb531171bce964c769bfc582af650ee4a.jsassets.adobedtm.com/launch-ENb53117... https://assets.adobedtm.com/launch-ENb531171bce964c769bfc582af650ee4a.js — 200 — 91.9 KiB — 47 ms — http/1.1https://www.enel.com/content/dam/enel-com/immagini/enel-logo/logo-solido.svgwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/enel-logo/logo-solido.svg — 200 — 8.4 KiB — 16 ms — h2https://www.enel.com/content/dam/enel-com/immagini/enel-logo/logo-enel-white.svgwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/enel-logo/logo-enel-white.svg — 200 — 5.2 KiB — 12 ms — h2https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/img/icon-chevron-down.svgwww.enel.com/etc.clientlibs/enel-co... https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/img/icon-chevron-down.svg — 200 — 546 B — 12 ms — h2https://www.enel.com/content/dam/enel-com/immagini/loghi-e-icone/storia_48px.svgwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/loghi-e-icone/storia_48px.svg — 200 — 1021 B — 11 ms — h2https://www.enel.com/content/dam/enel-com/immagini/loghi-e-icone/vision_48px.svgwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/loghi-e-icone/vision_48px.svg — 200 — 896 B — 4 ms — h2https://www.enel.com/etc.clientlibs/clientlibs/granite/jquery/granite/csrf.lc-652a558c3774088b61b0530c184710d1-lc.min.jswww.enel.com/etc.clientlibs/clientl... https://www.enel.com/etc.clientlibs/clientlibs/granite/jquery/granite/csrf.lc-652a558c3774088b61b0530c184710d1-lc.min.js — 200 — 3.7 KiB — 15 ms — h2https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle.lc-81b320f9fffb178b64202b1365875526-lc.min.jswww.enel.com/etc.clientlibs/enel-co... https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle.lc-81b320f9fffb178b64202b1365875526-lc.min.js — 200 — 847.3 KiB — 39 ms — h2https://www.enel.com/content/dam/enel-com/immagini/loghi-e-icone/mappa_48px.svgwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/loghi-e-icone/mappa_48px.svg — 200 — 971 B — 16 ms — h2https://dpm.demdex.net/id?d_visid_ver=5.5.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_orgid=374FFED355B616DC7F000101%40AdobeOrg&d_nsid=0&ts=1783799970360dpm.demdex.net/id?d_visid_ver=5.5.0... https://dpm.demdex.net/id?d_visid_ver=5.5.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_orgid=374FFED355B616DC7F000101%40AdobeOrg&d_nsid=0&ts=1783799970360 — 200 — 915 B — 133 ms — h2https://www.enel.com/content/dam/enel-com/immagini/loghi-e-icone/gruppo-enel_48px.svgwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/loghi-e-icone/gruppo-enel_48px.svg — 200 — 788 B — 5 ms — h2https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/img/usa-flag.svgwww.enel.com/etc.clientlibs/enel-co... https://www.enel.com/etc.clientlibs/enel-common/clientlibs/clientlib-bundle/resources/img/usa-flag.svg — 200 — 54.6 KiB — 13 ms — h2https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.js — 200 — 13.4 KiB — 10 ms — http/1.1https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.js — 200 — 2.2 KiB — 11 ms — http/1.1https://www.enel.com/libs/granite/csrf/token.jsonwww.enel.com/libs/granite/csrf/toke... https://www.enel.com/libs/granite/csrf/token.json — 200 — 132 B — 51 ms — h2https://www.enel.com/content/dam/enel-com/immagini/elevator-pitch_2880x1700/about-us-products-services_2880x1700.jpg.resize.1440.850.center.center.jpegwww.enel.com/content/dam/enel-com/i... 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h2https://www.enel.com/content/dam/enel-com/immagini/master-azienda_2400x1160/storie_2400x1160/cmd-2026-cattaneo-enel_2400x1160.jpg.resize.348.300.center.center.jpegwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/master-azienda_2400x1160/storie_2400x1160/cmd-2026-cattaneo-enel_2400x1160.jpg.resize.348.300.center.center.jpeg — 200 — 20.5 KiB — 13 ms — h2https://www.enel.com/content/dam/enel-com/immagini/master-azienda_2400x1160/storie_2400x1160/windesign-ad-premiazione_2400x1160c.jpg.resize.348.300.center.center.jpegwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/master-azienda_2400x1160/storie_2400x1160/windesign-ad-premiazione_2400x1160c.jpg.resize.348.300.center.center.jpeg — 200 — 21.5 KiB — 27 ms — h2https://www.enel.com/content/dam/enel-com/immagini/content-box_768x600/panchinerosse-eng_no_logo_768x600.jpg.resize.348.300.center.center.jpegwww.enel.com/content/dam/enel-com/i... 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h2https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RCe768bf6d8eff4ea495cab6f62f470268-source.jsassets.adobedtm.com/58373ae8f4f6/1c... https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RCe768bf6d8eff4ea495cab6f62f470268-source.js — 200 — 803 B — 37 ms — http/1.1https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RCdcc61a84fcd84b068d2c39576dedf22d-source.jsassets.adobedtm.com/58373ae8f4f6/1c... https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RCdcc61a84fcd84b068d2c39576dedf22d-source.js — 200 — 1.1 KiB — 29 ms — http/1.1https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC1608e7ad1cd541d690e9adec75ebc923-source.jsassets.adobedtm.com/58373ae8f4f6/1c... https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC1608e7ad1cd541d690e9adec75ebc923-source.js — 200 — 1.1 KiB — 29 ms — http/1.1https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC25aeefff7bdd4f86a4369efb186ab44e-source.jsassets.adobedtm.com/58373ae8f4f6/1c... https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC25aeefff7bdd4f86a4369efb186ab44e-source.js — 200 — 886 B — 53 ms — http/1.1https://enelglobal.d3.sc.omtrdc.net/id?d_visid_ver=5.5.0&d_fieldgroup=A&mcorgid=374FFED355B616DC7F000101%40AdobeOrg&mid=39450253934564603441568105477375916648&ts=1783799971084enelglobal.d3.sc.omtrdc.net/id?d_vi... https://enelglobal.d3.sc.omtrdc.net/id?d_visid_ver=5.5.0&d_fieldgroup=A&mcorgid=374FFED355B616DC7F000101%40AdobeOrg&mid=39450253934564603441568105477375916648&ts=1783799971084 — 200 — 265 B — 104 ms — h2https://cm.everesttech.net/cm/dd?d_uuid=39408149162576640031570659401651618899cm.everesttech.net/cm/dd?d_uuid=394... https://cm.everesttech.net/cm/dd?d_uuid=39408149162576640031570659401651618899 — 302 — 517 B — 165 ms — http/1.1https://enelglobal.demdex.net/dest5.html?d_nsid=0enelglobal.demdex.net/dest5.html?d_... https://enelglobal.demdex.net/dest5.html?d_nsid=0 — 200 — 3.2 KiB — 143 ms — h2https://www.enel.com/content/dam/enel-com/immagini/master-azienda_2400x1160/storie_2400x1160/centrale-idroelettrica-taccani-trezzo-adda-lombardia_2400x1600.jpg.resize.348.300.center.center.jpegwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/master-azienda_2400x1160/storie_2400x1160/centrale-idroelettrica-taccani-trezzo-adda-lombardia_2400x1600.jpg.resize.348.300.center.center.jpeg — 200 — 34 B — 7 ms — h2https://www.enel.com/content/dam/enel-com/immagini/master-azienda_2400x1160/storie_2400x1160/unga-2_2400x1160.jpg.resize.348.300.center.center.jpegwww.enel.com/content/dam/enel-com/i... https://www.enel.com/content/dam/enel-com/immagini/master-azienda_2400x1160/storie_2400x1160/unga-2_2400x1160.jpg.resize.348.300.center.center.jpeg — 200 — 16 B — 7 ms — h2https://consent.trustarc.com/notice?domain=enel.com&c=teconsent&js=nj&noticeType=bb&gtm=1&text=true&language=enconsent.trustarc.com/notice?domain=... https://consent.trustarc.com/notice?domain=enel.com&c=teconsent&js=nj&noticeType=bb&gtm=1&text=true&language=en — 200 — 13.3 KiB — 69 ms — h2https://dpm.demdex.net/ibs:dpid=411&dpuuid=alKgowAAANYiNwNndpm.demdex.net/ibs:dpid=411&dpuuid=... https://dpm.demdex.net/ibs:dpid=411&dpuuid=alKgowAAANYiNwNn — 302 — 531 B — 36 ms — h2https://dpm.demdex.net/demconf.jpg?et:ibs%7cdata:dpid=411&dpuuid=alKgowAAANYiNwNndpm.demdex.net/demconf.jpg?et:ibs%7... https://dpm.demdex.net/demconf.jpg?et:ibs%7cdata:dpid=411&dpuuid=alKgowAAANYiNwNn — 200 — 469 B — 36 ms — h2https://consent.trustarc.com/analytics?action=0&domain=enel.com&implied=1&session=0233c52a57ca4148ab1f45a496a6a0b3&new=1&referer=https://www.enel.comconsent.trustarc.com/analytics?acti... https://consent.trustarc.com/analytics?action=0&domain=enel.com&implied=1&session=0233c52a57ca4148ab1f45a496a6a0b3&new=1&referer=https://www.enel.com — 200 — 464 B — 36 ms — h2https://consent.trustarc.com/asset/notice.js/v/v1.7-9089consent.trustarc.com/asset/notice.j... https://consent.trustarc.com/asset/notice.js/v/v1.7-9089 — 200 — 31.2 KiB — 8 ms — h2https://www.enel.com/content/enel-com/favicon.icowww.enel.com/content/enel-com/favic... https://www.enel.com/content/enel-com/favicon.ico — 200 — 1.7 KiB — 3 ms — h2https://consent.trustarc.com/analytics?action=1&domain=enel.com&implied=1&session=0233c52a57ca4148ab1f45a496a6a0b3&new=1&referer=https://www.enel.comconsent.trustarc.com/analytics?acti... https://consent.trustarc.com/analytics?action=1&domain=enel.com&implied=1&session=0233c52a57ca4148ab1f45a496a6a0b3&new=1&referer=https://www.enel.com — 200 — 466 B — 39 ms — h2https://consent.trustarc.com/get?name=arena_close.svgconsent.trustarc.com/get?name=arena... https://consent.trustarc.com/get?name=arena_close.svg — 200 — 865 B — 14 ms — h2https://consent.trustarc.com/get?name=roobertenel-regular.woff2consent.trustarc.com/get?name=roobe... https://consent.trustarc.com/get?name=roobertenel-regular.woff2 — 200 — 45.6 KiB — 8 ms — h2https://consent.trustarc.com/get?name=roobertenel-bold.woff2consent.trustarc.com/get?name=roobe... https://consent.trustarc.com/get?name=roobertenel-bold.woff2 — 200 — 46.0 KiB — 8 ms — h2https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC7a8b19af09fc45a69b7405d0b323b2a8-source.jsassets.adobedtm.com/58373ae8f4f6/1c... https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC7a8b19af09fc45a69b7405d0b323b2a8-source.js — 200 — 782 B — 5 ms — http/1.1https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC6220241d3fa840e49159e9c272289e2d-source.jsassets.adobedtm.com/58373ae8f4f6/1c... https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RC6220241d3fa840e49159e9c272289e2d-source.js — 200 — 771 B — 7 ms — http/1.1https://www.enel.com/content/enel-com/favicon.icowww.enel.com/content/enel-com/favic... https://www.enel.com/content/enel-com/favicon.ico — 200 — 16 B — 9 ms — h2https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RCa26ae5993dee4838ba5b457c432e7484-source.jsassets.adobedtm.com/58373ae8f4f6/1c... https://assets.adobedtm.com/58373ae8f4f6/1c927e7a32ab/83adb7e0bcf9/RCa26ae5993dee4838ba5b457c432e7484-source.js — 200 — 871 B — 5 ms — http/1.1https://enelglobal.d3.sc.omtrdc.net/b/ss/enelspa.enelcom.prod/1/JS-2.27.0-LGPQ/s69235959287184?AQB=1&ndh=1&pf=1&t=11%2F6%2F2026%2019%3A59%3A33%206%200&mid=39450253934564603441568105477375916648&aamlh=6&ce=UTF-8&pageName=en%3Aazienda%3Achi-siamo&g=https%3A%2F%2Fwww.enel.com%2F&cc=EUR&ch=en&server=www.enel.com&events=event1&aamb=6G1ynYcLPuiQxYZrsz_pkqfLG9yMXBpb2zX5dvJdYQJzPXImdj0y&v1=en%3Aazienda&v2=en%3Aazienda%3Achi-siamo&v3=en%3Aazienda%3Achi-siamo&v4=en%3Aazienda%3Achi-siamo&v5=en%3Aazienda%3Achi-siamo&v6=en%3Aazienda%3Achi-siamo&v7=en&c8=D%3Dv8&c9=D%3Dv9&v9=First%20Visit&c10=D%3Dv10&v10=New&c11=D%3Dv11&v11=9%3A30PM&c12=D%3Dv12&v12=Saturday&c13=D%3Dv13&v13=Weekend&v19=en&v31=home&v32=company&v33=desktop&c45=D%3Dv45&v74=production%7C2026-03-30t08%3A11%3A57z&v75=https%3A%2F%2Fwww.enel.com%2F&v76=Mozilla%2F5.0%20%28Macintosh%3B%20Intel%20Mac%20OS%20X%2010_15_7%29%20AppleWebKit%2F537.36%20%28KHTML%2C%20like%20Gecko%29%20Chrome%2F150.0.0.0%20Safari%2F537.36&v197=www.enel.com%2F&s=800x600&c=24&j=1.6&v=N&k=Y&bw=1350&bh=940&mcorgid=374FFED355B616DC7F000101%40AdobeOrg&AQE=1enelglobal.d3.sc.omtrdc.net/b/ss/en... https://enelglobal.d3.sc.omtrdc.net/b/ss/enelspa.enelcom.prod/1/JS-2.27.0-LGPQ/s69235959287184?AQB=1&ndh=1&pf=1&t=11%2F6%2F2026%2019%3A59%3A33%206%200&mid=39450253934564603441568105477375916648&aamlh=6&ce=UTF-8&pageName=en%3Aazienda%3Achi-siamo&g=https%3A%2F%2Fwww.enel.com%2F&cc=EUR&ch=en&server=www.enel.com&events=event1&aamb=6G1ynYcLPuiQxYZrsz_pkqfLG9yMXBpb2zX5dvJdYQJzPXImdj0y&v1=en%3Aazienda&v2=en%3Aazienda%3Achi-siamo&v3=en%3Aazienda%3Achi-siamo&v4=en%3Aazienda%3Achi-siamo&v5=en%3Aazienda%3Achi-siamo&v6=en%3Aazienda%3Achi-siamo&v7=en&c8=D%3Dv8&c9=D%3Dv9&v9=First%20Visit&c10=D%3Dv10&v10=New&c11=D%3Dv11&v11=9%3A30PM&c12=D%3Dv12&v12=Saturday&c13=D%3Dv13&v13=Weekend&v19=en&v31=home&v32=company&v33=desktop&c45=D%3Dv45&v74=production%7C2026-03-30t08%3A11%3A57z&v75=https%3A%2F%2Fwww.enel.com%2F&v76=Mozilla%2F5.0%20%28Macintosh%3B%20Intel%20Mac%20OS%20X%2010_15_7%29%20AppleWebKit%2F537.36%20%28KHTML%2C%20like%20Gecko%29%20Chrome%2F150.0.0.0%20Safari%2F537.36&v197=www.enel.com%2F&s=800x600&c=24&j=1.6&v=N&k=Y&bw=1350&bh=940&mcorgid=374FFED355B616DC7F000101%40AdobeOrg&AQE=1 — 200 — 224 B — 26 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
93% of JavaScript execution is third-party
First-party Third-party 5351ms · 1022KB · €58/mo
www.enel.com
Other
Costly
Execution 3633ms
Transfer 847 KB
Unused 79%
Monthly Cost €39/mo
www.enel.com
Other
Costly
Execution 1495ms
Transfer 51 KB
Monthly Cost €16/mo
assets.adobedtm.com
Other
Optional
Execution 161ms
Transfer 92 KB
Monthly Cost €2/mo
consent.trustarc.com
Other
Optional
Execution 61ms
Transfer 31 KB
Unused 71%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.enel.com adds 3633ms and costs ~€39/month
  • www.enel.com adds 1495ms and costs ~€16/month

93% 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.enel.com takes 3633ms 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

79% of www.enel.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.enel.com takes 1495ms 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

71% of consent.trustarc.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
27 images, 399 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

27

Total Size

399 KB

2 missing alt text 27 missing dimensions 24 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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