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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
4
REVIEW
7
PASS
12
INFO
4

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

Mobile Desktop
5
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.
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.

6.16 s

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

7.75 s

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

1.62 s

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

2.811

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

13.86 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.

14.27 s

Page Load Progression

971 ms
1.9 s
2.9 s
3.9 s
4.9 s
5.8 s
6.8 s
7.8 s
Checks
27
12 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5830ms total JS execution
FIX
5830ms total JS execution
Warning::
https://kosmos-prod.react.gammacdn.com/react-18-2-...: 1860ms CPU time
Warning::
https://kosmos-prod.react.gammacdn.com/app.modern....: 1020ms CPU time
Warning::
Unattributable: 663ms CPU time
Warning::
https://www.roccosiffredi.com/sfw: 584ms CPU time
Warning::
https://www.roccosiffredi.com/cdn-cgi/scripts/7d0f...: 371ms CPU time
Warning::
Third-party scripts: 5167ms (89% of total)

Main Thread Breakdown

Script Evaluation 62% Other 17% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://kosmos-prod.react.gammacdn.com/react-18-2-0-prod.js1860ms1729ms2ms3rd
https://kosmos-prod.react.gammacdn.com/app.modern.185d5ea69026b0168e4d.js1020ms617ms217ms3rd
Unattributable663ms88ms0ms1st
https://www.roccosiffredi.com/sfw584ms5ms1ms3rd
https://www.roccosiffredi.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js371ms159ms18ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWVMJ48292ms218ms57ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HCRTF4K1E5&cx=c&gtm=4e69n1286ms195ms67ms3rd
https://kosmos-prod.react.gammacdn.com/ajv.modern.7550aa334019432050ac.js247ms218ms18ms3rd
https://cdn.izooto.com/scripts/sdk/main.js218ms150ms55ms3rd
https://d3a3ewgd1iewwz.cloudfront.net/promomessages/dist.js173ms145ms18ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
23 scripts, 469 KB unused
FIX
23 scripts, 469 KB unused
Warning::
https://kosmos-prod.react.gammacdn.com/app.modern....: 246 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HCRT...: 72 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.izooto.com/scripts/sdk/main.js: 66 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TWV...: 64 KB unused (50%)
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: 469 KB
469 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://kosmos-prod.react.gammacdn.com/app.modern.185d5ea69026b0168e4d.js442 KB246 KB (56%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HCRTF4K1E5&cx=c&gtm=4e69n1163 KB72 KB (44%)✓3rd
https://cdn.izooto.com/scripts/sdk/main.js97 KB66 KB (68%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWVMJ48129 KB64 KB (50%)✓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.js5 KB—✓3rd
https://d3a3ewgd1iewwz.cloudfront.net/promomessages/dist.js38 KB—✓3rd
https://www.roccosiffredi.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4 KB—✓3rd
https://kosmos-prod.react.gammacdn.com/legal-client.modern.944c9843f2bd6f2649a8.js2 KB—✓3rd
https://kosmos-prod.react.gammacdn.com/ajv.modern.7550aa334019432050ac.js34 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
89 resources · 1.5 MB · 469 KB savings available
FIX
89 resources · 1.5 MB · 469 KB savings available
Warning::
Page weight 1.5 MB exceeds 1 MB target by 503 KB
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~469 KB of savings available
Warning::
88 third-party resources (100% of weight)
Info::
1 resources over 200KB
89 resources · 1.5 MiB · 88 third-party 502.5 KiB over 1MB target
JavaScript 69% · 1.0 MiB
Image 15% · 236.2 KiB
Font 8% · 122.3 KiB
CSS 4% · 60.8 KiB
Document 2% · 26.0 KiB
Other 2% · 23.2 KiB

~469.3 KiB of savings available

Remove unused JavaScript: 469.3 KiB
B
Page Weight Budget
1.5 MB transferred, 89 requests
REVIEW
1.5 MB transferred, 89 requests
Info::
Page weighs 4.2 MB (1.5 MB transferred)
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
89 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
89 requests
0.31 g CO2 per page load
JavaScript 1.0 MiB 69%
Images 233.4 KiB 15%
Fonts 122.3 KiB 8%
CSS 60.8 KiB 4%
Other 27.6 KiB 2%
HTML 16.7 KiB 1%
Other 7.2 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

B
Image Optimization
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
29 images 233 KB
0 oversized -0 KB
7 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
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
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
Last-Modified header present
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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 8.0 s FCP 6.2 s LCP 7.7 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 — 416 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 — 379 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 — 402 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 — 356 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 — 151 ms — font-display: swap
Lato-Regular.woff2 woff2 swap
Size 29 KB
Load time 416 ms
Start 6.6 s
Risk FOUT — text flashes from fallback to web font
hind-regular-webfont.woff2 woff2 swap
Size 18 KB
Load time 379 ms
Start 6.6 s
Risk FOUT — text flashes from fallback to web font
hind-bold-webfont.woff2 woff2 swap
Size 18 KB
Load time 402 ms
Start 6.6 s
Risk FOUT — text flashes from fallback to web font
Lato-Bold.woff2 woff2 swap
Size 29 KB
Load time 356 ms
Start 6.8 s
Risk FOUT — text flashes from fallback to web font
Lato-Black.woff2 woff2 swap
Size 28 KB
Load time 151 ms
Start 7.3 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+
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
PASS
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache
A
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: gzip` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
Info::
`Last-Modified` present -- timestamp-based conditional GET supported
Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
Total JS execution time is 5.8 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+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
89 requests over 9619ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 6.2 s LCP 7.7 shttps://roccosiffredi.net// https://roccosiffredi.net/ — 302 — 387 B — 3.7 s — http/1.1https://www.g2fame.com/roccosiffredi/go.php?pr=8&su=2&si=123&ad=201056&pa=index&ar=&campaign=266488&buffer=www.g2fame.com/roccosiffredi/go.php... https://www.g2fame.com/roccosiffredi/go.php?pr=8&su=2&si=123&ad=201056&pa=index&ar=&campaign=266488&buffer= — 301 — 560 B — 188 ms — h2https://www.roccosiffredi.com/track/go.php?pr=8&su=2&si=123&ad=201056&pa=index&ar=&campaign=266488&buffer=www.roccosiffredi.com/track/go.php?... https://www.roccosiffredi.com/track/go.php?pr=8&su=2&si=123&ad=201056&pa=index&ar=&campaign=266488&buffer= — 301 — 2.9 KiB — 554 ms — h2https://www.roccosiffredi.com/?utm_source=201056&utm_medium=affiliate&utm_campaign=roccosiffredi.net_iwww.roccosiffredi.com/?utm_source=2... https://www.roccosiffredi.com/?utm_source=201056&utm_medium=affiliate&utm_campaign=roccosiffredi.net_i — 302 — 603 B — 312 ms — h2https://www.roccosiffredi.com/sfwwww.roccosiffredi.com/sfw https://www.roccosiffredi.com/sfw — 200 — 15.0 KiB — 1.2 s — 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 — 876 B — 350 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 — 914 B — 353 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 — 358 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 — 355 ms — h2https://kosmos-prod.react.gammacdn.com/main.modern.185d5ea69026b0168e4d.csskosmos-prod.react.gammacdn.com/main... https://kosmos-prod.react.gammacdn.com/main.modern.185d5ea69026b0168e4d.css — 200 — 23.6 KiB — 49 ms — h2https://kosmos-prod.react.gammacdn.com/roccosiffredi.theme.modern.185d5ea69026b0168e4d.csskosmos-prod.react.gammacdn.com/rocc... https://kosmos-prod.react.gammacdn.com/roccosiffredi.theme.modern.185d5ea69026b0168e4d.css — 200 — 27.7 KiB — 51 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 — 8 ms — h2https://kosmos-prod.react.gammacdn.com/app.modern.185d5ea69026b0168e4d.jskosmos-prod.react.gammacdn.com/app.... https://kosmos-prod.react.gammacdn.com/app.modern.185d5ea69026b0168e4d.js — 200 — 441.8 KiB — 45 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 — 112 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 — 33.6 KiB — 146 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 — 40.5 KiB — 41 ms — h2https://kosmos-prod.react.gammacdn.com/react-18-2-0-prod.jskosmos-prod.react.gammacdn.com/reac... https://kosmos-prod.react.gammacdn.com/react-18-2-0-prod.js — 200 — 4.6 KiB — 30 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
89% of JavaScript execution is third-party
First-party Third-party 5167ms · 985KB · $69/mo
kosmos-prod.react.gammacdn.com
Other
Costly
Execution 1860ms
Transfer 5 KB
Monthly Cost $25/mo
kosmos-prod.react.gammacdn.com
Other
Costly
Execution 1020ms
Transfer 442 KB
Unused 56%
Monthly Cost $14/mo
www.roccosiffredi.com
Other
Costly
Execution 584ms
Transfer 15 KB
Monthly Cost $8/mo
www.roccosiffredi.com
Other
Costly
Execution 371ms
Transfer 4 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 292ms
Transfer 129 KB
Unused 50%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 286ms
Transfer 163 KB
Unused 44%
Monthly Cost $4/mo
kosmos-prod.react.gammacdn.com
Other
Costly
Execution 247ms
Transfer 34 KB
Monthly Cost $3/mo
cdn.izooto.com
Other
Costly
Execution 218ms
Transfer 97 KB
Unused 68%
Monthly Cost $3/mo
d3a3ewgd1iewwz.cloudfront.net
Other
Optional
Execution 173ms
Transfer 38 KB
Monthly Cost $2/mo
kosmos-prod.react.gammacdn.com
Other
Optional
Execution 63ms
Transfer 25 KB
Monthly Cost $1/mo
static01-cms-fame.gammacdn.com
Other
Optional
Execution 52ms
Transfer 34 KB
Unused 66%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • kosmos-prod.react.gammacdn.com adds 1860ms and costs ~$25/month
  • kosmos-prod.react.gammacdn.com adds 1020ms and costs ~$14/month
  • www.roccosiffredi.com adds 584ms and costs ~$8/month
  • www.roccosiffredi.com adds 371ms and costs ~$5/month
  • Google Tag Manager adds 292ms and costs ~$4/month
  • Google Tag Manager adds 286ms and costs ~$4/month
  • kosmos-prod.react.gammacdn.com adds 247ms and costs ~$3/month
  • cdn.izooto.com adds 218ms and costs ~$3/month

89% 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 1860ms 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 1020ms 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

56% 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 584ms 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 371ms 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 292ms 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 286ms 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 247ms 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

cdn.izooto.com takes 218ms 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

68% 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

66% of static01-cms-fame.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

How third-party costs are calculated

Image Optimization
33 images, 988 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

33

Total Size

988 KB

23 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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