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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
5
REVIEW
7
PASS
11
INFO
3

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

Mobile Desktop
13
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.
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.

5.72 s

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

6.85 s

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

1.07 s

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

2.825

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

6.65 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.

13.10 s

Page Load Progression

400 ms
799 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
26
11 PASS 7 REVIEW 5 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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4796ms total JS execution
FIX
4796ms total JS execution
Warning::
https://kosmos-prod.react.gammacdn.com/react-18-2-...: 1607ms CPU time
Warning::
https://kosmos-prod.react.gammacdn.com/app.modern....: 849ms CPU time
Warning::
Unattributable: 638ms CPU time
Warning::
https://www.roccosiffredi.com/cdn-cgi/scripts/7d0f...: 397ms CPU time
Warning::
https://www.roccosiffredi.com/sfw: 374ms CPU time
Warning::
Third-party scripts: 4157ms (87% of total)

Main Thread Breakdown

Script Evaluation 62% Other 20% Style & Layout 7% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://kosmos-prod.react.gammacdn.com/react-18-2-0-prod.js1607ms1464ms2ms3rd
https://kosmos-prod.react.gammacdn.com/app.modern.a55b1bb9210948d9a92f.js849ms567ms139ms3rd
Unattributable638ms74ms0ms1st
https://www.roccosiffredi.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js397ms127ms18ms3rd
https://www.roccosiffredi.com/sfw374ms4ms1ms3rd
https://kosmos-prod.react.gammacdn.com/ajv.modern.dc1ca7d5f1faf79c83c3.js270ms243ms9ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWVMJ48209ms163ms35ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HCRTF4K1E5&cx=c&gtm=4e6781199ms152ms46ms3rd
https://cdn.izooto.com/scripts/sdk/main.js185ms130ms41ms3rd
https://kosmos-prod.react.gammacdn.com/lodash-4-17-2.js67ms41ms5ms3rd
D
JS Bundles
Action
22 scripts, 449 KB unused
FIX
22 scripts, 449 KB unused
Warning::
https://kosmos-prod.react.gammacdn.com/app.modern....: 233 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HCRT...: 69 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.izooto.com/scripts/sdk/main.js: 63 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TWV...: 62 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static01-cms-fame.gammacdn.com/c/minify/80...: 22 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 449 KB
449 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://kosmos-prod.react.gammacdn.com/app.modern.a55b1bb9210948d9a92f.js426 KB233 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HCRTF4K1E5&cx=c&gtm=4e6781155 KB69 KB (45%)✓3rd
https://cdn.izooto.com/scripts/sdk/main.js96 KB63 KB (66%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWVMJ48128 KB62 KB (49%)✓3rd
https://static01-cms-fame.gammacdn.com/c/minify/80/6628daca02f400be6ec1cae12b1bdf.js34 KB22 KB (66%)✓3rd
https://kosmos-prod.react.gammacdn.com/react-18-2-0-prod.js4 KB—✓3rd
https://kosmos-prod.react.gammacdn.com/component-MediaSlider.modern.8cf27141111615adac4c.js2 KB—✓3rd
https://www.roccosiffredi.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4 KB—✓3rd
https://kosmos-prod.react.gammacdn.com/ajv.modern.dc1ca7d5f1faf79c83c3.js32 KB—✓3rd
https://kosmos-prod.react.gammacdn.com/legal-client.modern.9a29259d58b342b57caa.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

F
Page Weight Inventory
Action
96 resources · 1.6 MB · 449 KB savings available
FIX
96 resources · 1.6 MB · 449 KB savings available
Warning::
Page weight 1.6 MB exceeds 1 MB target by 647 KB
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~449 KB of savings available
Warning::
95 third-party resources (100% of weight)
Info::
1 resources over 200KB
96 resources · 1.6 MiB · 95 third-party 646.9 KiB over 1MB target
JavaScript 60% · 994.9 KiB
Image 26% · 442.4 KiB
Font 7% · 122.3 KiB
CSS 4% · 61.4 KiB
Document 2% · 29.5 KiB
Other 1% · 20.5 KiB

~449.2 KiB of savings available

Remove unused JavaScript: 449.2 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
Page Weight Budget
Action
1.6 MB transferred, 96 requests
REVIEW
1.6 MB transferred, 96 requests
Info::
Page weighs 4.2 MB (1.6 MB transferred)
Warning::
JavaScript is 995 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 995 KB
Info::
96 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
96 requests
0.34 g CO2 per page load
JavaScript 994.9 KiB 60%
Images 439.7 KiB 26%
Fonts 122.3 KiB 7%
CSS 61.4 KiB 4%
Other 29.4 KiB 2%
HTML 19.0 KiB 1%
Other 3.7 KiB 0%
Other 553 B 0%
Other 0 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://static01-cms-fame.gammacdn.com/roccosiffre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ctf-images.gammacdn.com/cdyxtpbavd4i/6rPfa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 440 KB
0 oversized -0 KB
10 legacy format
2 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

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.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 4.8 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
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 (122 KB)
PASS
5 fonts (122 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

122 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 5.7 s LCP 6.9 shttps://static01-cms-buddies.gammacdn.com/evilangel/m/cs4y2tri7s0gggo0/Lato-Regular.woff2Lato-Regular.woff2 https://static01-cms-buddies.gammacdn.com/evilangel/m/cs4y2tri7s0gggo0/Lato-Regular.woff2 — 29.3 KiB — 53 ms — font-display: swaphttps://static01-cms-fame.gammacdn.com/underthebed/m/cust0114gpc88840/hind-regular-webfont.woff2hind-regular-webfont.woff2 https://static01-cms-fame.gammacdn.com/underthebed/m/cust0114gpc88840/hind-regular-webfont.woff2 — 18.0 KiB — 9 ms — font-display: swaphttps://static01-cms-fame.gammacdn.com/underthebed/m/6azd2cshpdc8scgk/hind-bold-webfont.woff2hind-bold-webfont.woff2 https://static01-cms-fame.gammacdn.com/underthebed/m/6azd2cshpdc8scgk/hind-bold-webfont.woff2 — 17.9 KiB — 10 ms — font-display: swaphttps://static01-cms-buddies.gammacdn.com/evilangel/m/18nby11jr6jo4s0g/Lato-Bold.woff2Lato-Bold.woff2 https://static01-cms-buddies.gammacdn.com/evilangel/m/18nby11jr6jo4s0g/Lato-Bold.woff2 — 28.8 KiB — 7 ms — font-display: swaphttps://static01-cms-buddies.gammacdn.com/evilangel/m/24reawf4md5w04cs/Lato-Black.woff2Lato-Black.woff2 https://static01-cms-buddies.gammacdn.com/evilangel/m/24reawf4md5w04cs/Lato-Black.woff2 — 28.3 KiB — 3 ms — font-display: swap
Lato-Regular.woff2 woff2 swap
Size 29 KB
Load time 53 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
hind-regular-webfont.woff2 woff2 swap
Size 18 KB
Load time 9 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
hind-bold-webfont.woff2 woff2 swap
Size 18 KB
Load time 10 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
Lato-Bold.woff2 woff2 swap
Size 29 KB
Load time 7 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
Lato-Black.woff2 woff2 swap
Size 28 KB
Load time 3 ms
Start 1.7 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
17 hints, 0 missing preconnects
PASS
17 hints, 0 missing preconnects
Info::
Page uses 17 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
+1
11
prefetch
—

17 resource hints configured

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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
6 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
96 requests over 5018ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 5.7 s LCP 6.9 shttps://roccosiffredi.com// https://roccosiffredi.com/ — 301 — 414 B — 224 ms — h2https://www.roccosiffredi.com/www.roccosiffredi.com/ https://www.roccosiffredi.com/ — 302 — 573 B — 343 ms — h2https://www.roccosiffredi.com/sfwwww.roccosiffredi.com/sfw https://www.roccosiffredi.com/sfw — 200 — 17.4 KiB — 638 ms — h2https://static01-cms-fame.gammacdn.com/c/minify/5c/052886e25b8670a1a4d4f10624eb3d.cssstatic01-cms-fame.gammacdn.com/c/mi... https://static01-cms-fame.gammacdn.com/c/minify/5c/052886e25b8670a1a4d4f10624eb3d.css — 200 — 829 B — 92 ms — h2https://static01-cms-fame.gammacdn.com/c/minify/3d/c9cbbace115d15fbd09a663a13d03d.cssstatic01-cms-fame.gammacdn.com/c/mi... https://static01-cms-fame.gammacdn.com/c/minify/3d/c9cbbace115d15fbd09a663a13d03d.css — 200 — 869 B — 96 ms — h2https://static01-cms-fame.gammacdn.com/c/minify/c9/65912b2679e997bbde94f588e7a2bb.cssstatic01-cms-fame.gammacdn.com/c/mi... https://static01-cms-fame.gammacdn.com/c/minify/c9/65912b2679e997bbde94f588e7a2bb.css — 200 — 1.6 KiB — 93 ms — h2https://static01-cms-fame.gammacdn.com/c/minify/fc/5b9b448d761b2ebbf94c7cd919bc77.cssstatic01-cms-fame.gammacdn.com/c/mi... https://static01-cms-fame.gammacdn.com/c/minify/fc/5b9b448d761b2ebbf94c7cd919bc77.css — 200 — 1.2 KiB — 93 ms — h2https://kosmos-prod.react.gammacdn.com/main.modern.a55b1bb9210948d9a92f.csskosmos-prod.react.gammacdn.com/main... https://kosmos-prod.react.gammacdn.com/main.modern.a55b1bb9210948d9a92f.css — 200 — 24.4 KiB — 126 ms — h2https://kosmos-prod.react.gammacdn.com/roccosiffredi.theme.modern.a55b1bb9210948d9a92f.csskosmos-prod.react.gammacdn.com/rocc... https://kosmos-prod.react.gammacdn.com/roccosiffredi.theme.modern.a55b1bb9210948d9a92f.css — 200 — 26.2 KiB — 126 ms — h2https://www.roccosiffredi.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.jswww.roccosiffredi.com/cdn-cgi/scrip... https://www.roccosiffredi.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js — 200 — 4.2 KiB — 29 ms — h2https://kosmos-prod.react.gammacdn.com/app.modern.a55b1bb9210948d9a92f.jskosmos-prod.react.gammacdn.com/app.... https://kosmos-prod.react.gammacdn.com/app.modern.a55b1bb9210948d9a92f.js — 200 — 426.1 KiB — 29 ms — h2https://static01-cms-fame.gammacdn.com/c/minify/1a/b8cdec795075c2b14a9bc140e294ee.jsstatic01-cms-fame.gammacdn.com/c/mi... https://static01-cms-fame.gammacdn.com/c/minify/1a/b8cdec795075c2b14a9bc140e294ee.js — 200 — 1.6 KiB — 7 ms — h2https://static01-cms-fame.gammacdn.com/c/minify/80/6628daca02f400be6ec1cae12b1bdf.jsstatic01-cms-fame.gammacdn.com/c/mi... https://static01-cms-fame.gammacdn.com/c/minify/80/6628daca02f400be6ec1cae12b1bdf.js — 200 — 34.4 KiB — 12 ms — h2https://kosmos-prod.react.gammacdn.com/react-dom-18-2-0-prod.jskosmos-prod.react.gammacdn.com/reac... https://kosmos-prod.react.gammacdn.com/react-dom-18-2-0-prod.js — 200 — 40.9 KiB — 25 ms 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https://2aed6ghjsb4436qtebuqk3gfzq0xeauy.lambda-url.us-east-1.on.aws/chug/event — 200 — 340 B — 201 ms — http/1.1https://2aed6ghjsb4436qtebuqk3gfzq0xeauy.lambda-url.us-east-1.on.aws/chug/event2aed6ghjsb4436qtebuqk3gfzq0xeauy.la... https://2aed6ghjsb4436qtebuqk3gfzq0xeauy.lambda-url.us-east-1.on.aws/chug/event — 200 — 340 B — 186 ms — http/1.1https://2aed6ghjsb4436qtebuqk3gfzq0xeauy.lambda-url.us-east-1.on.aws/chug/event2aed6ghjsb4436qtebuqk3gfzq0xeauy.la... https://2aed6ghjsb4436qtebuqk3gfzq0xeauy.lambda-url.us-east-1.on.aws/chug/event — 200 — 340 B — 203 ms — http/1.1https://cdn.izooto.com/scripts/sdk/izextf.jscdn.izooto.com/scripts/sdk/izextf.j... https://cdn.izooto.com/scripts/sdk/izextf.js — 200 — 12.3 KiB — 35 ms — h3https://www.gstatic.com/firebasejs/10.13.2/firebase-app-compat.jswww.gstatic.com/firebasejs/10.13.2/... https://www.gstatic.com/firebasejs/10.13.2/firebase-app-compat.js — 200 — 10.4 KiB — 122 ms — h2https://www.gstatic.com/firebasejs/10.13.2/firebase-messaging-compat.jswww.gstatic.com/firebasejs/10.13.2/... https://www.gstatic.com/firebasejs/10.13.2/firebase-messaging-compat.js — 200 — 9.9 KiB — 31 ms — h2https://sbp.izooto.com/nblksbp.izooto.com/nblk https://sbp.izooto.com/nblk — 200 — 408 B — 255 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
87% of JavaScript execution is third-party
First-party Third-party 4157ms · 889KB · $55/mo
kosmos-prod.react.gammacdn.com
Other
Costly
Execution 1607ms
Transfer 4 KB
Monthly Cost $21/mo
kosmos-prod.react.gammacdn.com
Other
Costly
Execution 849ms
Transfer 426 KB
Unused 55%
Monthly Cost $11/mo
www.roccosiffredi.com
Other
Costly
Execution 397ms
Transfer 4 KB
Monthly Cost $5/mo
www.roccosiffredi.com
Other
Costly
Execution 374ms
Transfer 17 KB
Monthly Cost $5/mo
kosmos-prod.react.gammacdn.com
Other
Costly
Execution 270ms
Transfer 32 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 209ms
Transfer 128 KB
Unused 49%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 199ms
Transfer 155 KB
Unused 45%
Monthly Cost $3/mo
cdn.izooto.com
Other
Optional
Execution 185ms
Transfer 96 KB
Unused 66%
Monthly Cost $2/mo
kosmos-prod.react.gammacdn.com
Other
Optional
Execution 67ms
Transfer 26 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • kosmos-prod.react.gammacdn.com adds 1607ms and costs ~$21/month
  • kosmos-prod.react.gammacdn.com adds 849ms and costs ~$11/month
  • www.roccosiffredi.com adds 397ms and costs ~$5/month
  • www.roccosiffredi.com adds 374ms and costs ~$5/month
  • kosmos-prod.react.gammacdn.com adds 270ms and costs ~$4/month
  • Google Tag Manager adds 209ms and costs ~$3/month

87% 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

kosmos-prod.react.gammacdn.com takes 1607ms 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

kosmos-prod.react.gammacdn.com takes 849ms 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 kosmos-prod.react.gammacdn.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.roccosiffredi.com takes 397ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.roccosiffredi.com takes 374ms 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

kosmos-prod.react.gammacdn.com takes 270ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 209ms 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

66% of cdn.izooto.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
24 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

24

Total Size

0 KB

Oversized

4

13 missing dimensions 8 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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