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https://altervista.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
69
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.

993 ms

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

1.51 s

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

34 ms

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.

1.22 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.

2.88 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 64 requests
FIX
3.7 MB transferred, 64 requests
Warning::
Page weighs 6.4 MB (3.7 MB transferred)
Warning::
Images are 2.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.5 MB
Warning::
JavaScript is 914 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 914 KB
Info::
64 HTTP requests
Info::
Estimated 0.77 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
64 requests
0.77 g CO2 per page load
Images 2.5 MiB 70%
JavaScript 914.2 KiB 24%
Other 137.3 KiB 4%
Fonts 42.0 KiB 1%
CSS 27.7 KiB 1%
HTML 15.7 KiB 0%
Other 2.2 KiB 0%
Other 1.5 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

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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
19 scripts, 394 KB unused
FIX
19 scripts, 394 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P9D...: 81 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.iubenda.com/cookie_solution/iubenda_cs...: 70 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NV8C...: 67 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-V379...: 63 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://en.altervista.org/js/registration-form-hom...: 46 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 394 KB
394 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-P9DRKPF159 KB81 KB (51%)✓3rd
https://cdn.iubenda.com/cookie_solution/iubenda_cs/1.94.1/core-en.js109 KB70 KB (64%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NV8CFBS0L2&cx=c&_slc=1167 KB67 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-V379M64RJN&cx=c&gtm=4e64h1151 KB63 KB (42%)✓3rd
https://en.altervista.org/js/registration-form-home.js?cb=a281e915c8ba6efffb10bab58fe25faa018b2ab7120 KB46 KB (39%)✓3rd
https://cdn-gl.imrworldwide.com/novms/js/2/nlsSDK600.bundle.min.js73 KB39 KB (54%)✓3rd
https://en.altervista.org/js/swiper-bundle.min.js46 KB28 KB (61%)✓3rd
https://cdn.iubenda.com/cs/tcf/stable/stub-v2.js2 KB—✓3rd
https://cdn-gl.imrworldwide.com/conf/P6940AB53-25D8-4A94-ACB8-49B65E046F91.js7 KB—✓3rd
https://dafne.sirio.stbm.it/utility-fe/prod/general/permutive/permutiveIdGenerator.js2 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

D
Page Weight Inventory
Action
64 resources · 3.7 MB · 394 KB savings available
FIX
64 resources · 3.7 MB · 394 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~394 KB of savings available
Warning::
63 third-party resources (100% of weight)
Info::
6 resources over 200KB
64 resources · 3.7 MiB · 63 third-party 2.7 MiB over 1MB target
Image 70% · 2.5 MiB
JavaScript 24% · 914.2 KiB
Other 4% · 139.5 KiB
Font 1% · 42.0 KiB
CSS 1% · 27.7 KiB
Document 0% · 16.4 KiB

~393.8 KiB of savings available

Remove unused JavaScript: 393.8 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.

B
Image Optimization
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://en.altervista.org/images/food_blogger_30_s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 2.5 MB
0 oversized -0 KB
21 legacy format
1 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

B
JS Execution Cost
523ms total JS execution
REVIEW
523ms total JS execution
Info::
https://en.altervista.org/: 103ms CPU time
Info::
https://cdn.iubenda.com/cookie_solution/iubenda_cs...: 88ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-V379...: 79ms CPU time
Info::
Unattributable: 78ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-NV8C...: 68ms CPU time
Warning::
Third-party scripts: 523ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 18% Style & Layout 12% Script Parsing & Compilation 12%
ScriptTotalScriptingParse/CompileParty
https://en.altervista.org/103ms14ms1ms3rd
https://cdn.iubenda.com/cookie_solution/iubenda_cs/1.94.1/core-en.js88ms60ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-V379M64RJN&cx=c&gtm=4e64h179ms60ms18ms3rd
Unattributable78ms8ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NV8CFBS0L2&cx=c&_slc=168ms57ms10ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P9DRKPF56ms40ms15ms3rd
https://en.altervista.org/js/registration-form-home.js?cb=a281e915c8ba6efffb10bab58fe25faa018b2ab751ms41ms7ms3rd
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 (42 KB)
PASS
5 fonts (42 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

42 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 FCP 993 ms LCP 1.5 shttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 26 ms — font-display: swaphttps://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr4uPhWnVaFrNlJz.woff2nKKU-Go6G5tXcr4uPhWnVaF... https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr4uPhWnVaFrNlJz.woff2 — 10.3 KiB — 31 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 33 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiGyp8kv8JHgFVrJJLucHtAOvWDSA.woff2pxiGyp8kv8JHgFVrJJLucHt... https://fonts.gstatic.com/s/poppins/v24/pxiGyp8kv8JHgFVrJJLucHtAOvWDSA.woff2 — 8.5 KiB — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 25 ms — font-display: swap
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 26 ms
Start 270 ms
Risk FOUT — text flashes from fallback to web font
nKKU-Go6G5tXcr4uPhWnVaF... woff2 swap
Size 10 KB
Load time 31 ms
Start 270 ms
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 33 ms
Start 270 ms
Risk FOUT — text flashes from fallback to web font
pxiGyp8kv8JHgFVrJJLucHt... woff2 swap
Size 8 KB
Load time 25 ms
Start 309 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 25 ms
Start 384 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
Network Waterfall
64 requests over 2701ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 993 ms LCP 1.5 shttps://altervista.org// https://altervista.org/ — 302 — 431 B — 118 ms — h2https://www.altervista.org/www.altervista.org/ https://www.altervista.org/ — 302 — 276 B — 13 ms — h2https://en.altervista.org/en.altervista.org/ https://en.altervista.org/ — 200 — 11.8 KiB — 10 ms — h2https://en.altervista.org/css/swiper-bundle.min.css?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7en.altervista.org/css/swiper-bundle... https://en.altervista.org/css/swiper-bundle.min.css?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7 — 200 — 4.8 KiB — 7 ms — h2https://en.altervista.org/css/style.min.css?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7en.altervista.org/css/style.min.css... https://en.altervista.org/css/style.min.css?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7 — 200 — 14.5 KiB — 12 ms — h2https://fonts.googleapis.com/css2?family=Kanit:wght@400;700;800&family=Poppins:ital,wght@0,400;0,600;0,700;0,800;1,400&display=fallbackfonts.googleapis.com/css2?family=Ka... https://fonts.googleapis.com/css2?family=Kanit:wght@400;700;800&family=Poppins:ital,wght@0,400;0,600;0,700;0,800;1,400&display=fallback — 200 — 1.3 KiB — 75 ms — h2https://en.altervista.org/css/registration-form-home.cssen.altervista.org/css/registration-... https://en.altervista.org/css/registration-form-home.css — 200 — 7.0 KiB — 12 ms — h2https://en.altervista.org/js/registration-form-home.js?cb=a281e915c8ba6efffb10bab58fe25faa018b2ab7en.altervista.org/js/registration-f... https://en.altervista.org/js/registration-form-home.js?cb=a281e915c8ba6efffb10bab58fe25faa018b2ab7 — 200 — 120.3 KiB — 16 ms — h2https://en.altervista.org/images/av-card-01-en.pngen.altervista.org/images/av-card-01... https://en.altervista.org/images/av-card-01-en.png — 200 — 27.1 KiB — 17 ms — h2https://en.altervista.org/images/av-card-02-en.jpgen.altervista.org/images/av-card-02... https://en.altervista.org/images/av-card-02-en.jpg — 200 — 31.9 KiB — 18 ms — h2https://en.altervista.org/images/av-card-03-en.jpgen.altervista.org/images/av-card-03... https://en.altervista.org/images/av-card-03-en.jpg — 200 — 93.7 KiB — 5 ms — h2https://en.altervista.org/images/av-card-04-en.pngen.altervista.org/images/av-card-04... https://en.altervista.org/images/av-card-04-en.png — 200 — 37.6 KiB — 6 ms — h2https://en.altervista.org/images/av-card-05-en.pngen.altervista.org/images/av-card-05... https://en.altervista.org/images/av-card-05-en.png — 200 — 44.2 KiB — 5 ms — h2https://en.altervista.org/js/common.min.js?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7en.altervista.org/js/common.min.js?... https://en.altervista.org/js/common.min.js?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7 — 200 — 1.4 KiB — 4 ms — h2https://en.altervista.org/js/home.min.js?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7en.altervista.org/js/home.min.js?ve... https://en.altervista.org/js/home.min.js?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7 — 200 — 1.1 KiB — 4 ms — h2https://en.altervista.org/js/swiper-bundle.min.jsen.altervista.org/js/swiper-bundle.... https://en.altervista.org/js/swiper-bundle.min.js — 200 — 46.3 KiB — 4 ms — h2https://en.altervista.org/js/rellax.min.jsen.altervista.org/js/rellax.min.js https://en.altervista.org/js/rellax.min.js — 200 — 2.8 KiB — 3 ms — h2https://en.altervista.org/images/av-card-06-en.pngen.altervista.org/images/av-card-06... https://en.altervista.org/images/av-card-06-en.png — 200 — 13.5 KiB — 3 ms — h2https://en.altervista.org/images/av-card-07-en.pngen.altervista.org/images/av-card-07... https://en.altervista.org/images/av-card-07-en.png — 200 — 17.2 KiB — 4 ms — h2https://en.altervista.org/images/av-card-08.pngen.altervista.org/images/av-card-08... https://en.altervista.org/images/av-card-08.png — 200 — 26.1 KiB — 3 ms — h2https://en.altervista.org/images/av-card-09-en.pngen.altervista.org/images/av-card-09... https://en.altervista.org/images/av-card-09-en.png — 200 — 40.0 KiB — 4 ms — h2https://en.altervista.org/images/av-card-10-en.pngen.altervista.org/images/av-card-10... https://en.altervista.org/images/av-card-10-en.png — 200 — 21.5 KiB — 3 ms — h2https://dafne.sirio.stbm.it/utility-fe/prod/general/network.common.v3.jsdafne.sirio.stbm.it/utility-fe/prod... https://dafne.sirio.stbm.it/utility-fe/prod/general/network.common.v3.js — 200 — 12.8 KiB — 68 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-P9DRKPFwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-P9DRKPF — 200 — 158.6 KiB — 145 ms — h2https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 200 — 7.8 KiB — 26 ms — h3https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr4uPhWnVaFrNlJz.woff2fonts.gstatic.com/s/kanit/v17/nKKU-... https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr4uPhWnVaFrNlJz.woff2 — 200 — 10.3 KiB — 31 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 200 — 7.7 KiB — 33 ms — h3https://en.altervista.org/locales/en/form.jsonen.altervista.org/locales/en/form.j... https://en.altervista.org/locales/en/form.json — 200 — 11.7 KiB — 5 ms — h2data:image/svg+xml;utf8,<svg version='1.0' xmlns='http://www.w3.org/2000/svg' fill='%23000000' view…www.w3.org/2000/svg' fill='%2300000... data:image/svg+xml;utf8,<svg version='1.0' xmlns='http://www.w3.org/2000/svg' fill='%23000000' view… — 200 — 0 B — 0 ms — datahttps://fonts.gstatic.com/s/poppins/v24/pxiGyp8kv8JHgFVrJJLucHtAOvWDSA.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiGyp8kv8JHgFVrJJLucHtAOvWDSA.woff2 — 200 — 8.5 KiB — 25 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 993 ms LCP 1.5 shttps://altervista.org// https://altervista.org/ — 302 — 431 B — 118 ms — h2https://www.altervista.org/www.altervista.org/ https://www.altervista.org/ — 302 — 276 B — 13 ms — h2https://en.altervista.org/en.altervista.org/ https://en.altervista.org/ — 200 — 11.8 KiB — 10 ms — h2https://en.altervista.org/css/swiper-bundle.min.css?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7en.altervista.org/css/swiper-bundle... https://en.altervista.org/css/swiper-bundle.min.css?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7 — 200 — 4.8 KiB — 7 ms — h2https://en.altervista.org/css/style.min.css?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7en.altervista.org/css/style.min.css... https://en.altervista.org/css/style.min.css?ver=a281e915c8ba6efffb10bab58fe25faa018b2ab7 — 200 — 14.5 KiB — 12 ms — 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https://secure-it.imrworldwide.com/cgi-bin/gn?prd=dcr&ci=it-605714&ch=it-605714_c67_altervistaportale_BRW_S&asn=altervistaportale_BRW&fp_id=&fp_cr_tm=&fp_acc_tm=&fp_emm_tm=&ve_id=&sessionId=8bfx8y2zrdmkuhcbjtojwkudxoy1r1776799189&prv=1&c6=vc,c67&ca=NA&c13=asid,P6940AB53-25D8-4A94-ACB8-49B65E046F91&c32=segA,NA&c33=segB,NA&c34=segC,NA&c15=apn,&sup=1&segment2=&segment1=&forward=0&plugv=&playerv=&ad=0&cr=V&c9=devid,&enc=true&c1=nuid,ild9prs0brcaikotizd1m1vhgjaja1776799189&at=view&rt=text&c16=sdkv,bj.6.0.0&c27=cln,0&crs=&lat=&lon=&c29=plid,17767991898395317&c30=bldv,6.0.0.747&st=dcr&c7=osgrp,&c8=devgrp,&c10=plt,&c40=adbid,&c14=osver,NA&c26=dmap,1&dd=&hrd=&wkd=&c35=adrsid,&c36=cref1,&c37=cref2,&c11=agg,1&c12=apv,&c51=adl,0&c52=noad,0&pc=NA&c53=fef,n&c54=oad,&c55=cref3,&c57=adldf,2&ai=en-6a992d5529f459a44fee58c733255e86&c3=st,c&c64=starttm,1776799191&adid=en-6a992d5529f459a44fee58c733255e86&c58=isLive,false&c59=sesid,&c61=createtm,1776799190&c63=pipMode,&uoo=&c68=bndlid,&nodeTM=&logTM=&c73=phtype,&c74=dvcnm,&c76=adbsnid,&c44=progen,&davty=0&si=https%3A%2F%2Fen.altervista.org%2F&c66=mediaurl,&sdd=&c62=sendTime,1776799190&rnd=715418 — 200 — 549 B — 108 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 523ms · 717KB · €8/mo
en.altervista.org
Other
Optional
Execution 103ms
Transfer 12 KB
Monthly Cost €2/mo
Iubenda
Consent
Essential
Execution 88ms
Transfer 109 KB
Unused 64%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 151 KB
Unused 42%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 78ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 167 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 159 KB
Unused 51%
Monthly Cost €1/mo
en.altervista.org
Other
Optional
Execution 51ms
Transfer 120 KB
Unused 39%
Monthly Cost €1/mo

100% 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

64% of Iubenda'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

51% of Google Tag Manager'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

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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